CUMMINS Diesel engines Fault Codes DTC

Service technicians have no problem recognising breakdowns and carrying out machine diagnostics, CUMMINS Diesel engines Fault Codes DTC, plus they are familiar with equipment from a variety of manufacturers.

Cummins Inc. is an American multinational corporation that designs, manufactures, and distributes engines, filtration, and power generation products. Cummins also services engines and related equipment, including fuel systems, controls, air handling, filtration, emission control, electrical power generation systems, and trucks. Headquartered in Columbus, Indiana, Cummins sells in approximately 190 countries and territories through a network of more than 600 company-owned and independent distributors and approximately 7,200 dealers. Cummins reported a net income of $2.19 billion on sales of $23.77 billion in 2018.

CUMMINS ISB Diesel engines Fault Codes list DTC

111 Electronic Control Module ECM Microprocessor
115 Engine Speed Sensor ESS Circuit
122 Intake Manifold Pressure Sensor Circuit
123 Intake Manifold Pressure Sensor Circuit
131 Accelerator Position Sensor Circuit
132 Accelerator Position Sensor Circuit
133 Remote Throttle Position Sensor
134 Remote Throttle Position Sensor
135 Oil Pressure Sensor Circuit
141 Oil Pressure Sensor/Switch Circuit Choice
141sn Oil Pressure Sensor Circuit
141sw Oil Pressure Switch Circuit
143 Oil Pressure Sensor/Switch Circuit Choice
143sn Oil Pressure Sensor Circuit
143sw Oil Pressure Switch Circuit
144 Coolant Temperature Sensor Circuit
146 Coolant Temperature – Engine Protection
151 Coolant Temperature – Engine Protection
153 Intake Manifold Air Temperature Sensor Circuit
154 Intake Manifold Air Temperature Sensor Circuit
155 Intake Manifold Air Temperature Sensor – Engine Protection Circuit
191 Air Conditioner Clutch Supply Circuit
221 Ambient Air Pressure Sensor Circuit
222 Ambient Air Pressure Sensor Circuit
234 Engine Overspeed Circuit
235 Engine Coolant Level – Engine Protection
241 Vehicle Speed Sensor Circuit
242 Vehicle Speed Sensor VSS Circuit
243 Exhaust Brake Supply Circuit
245 Engine Fan Clutch Supply Circuit
261 Fuel Temperature Sensor Circuit
264 VP44 Fuel Temperature Sensor Error
278 Lift Pump Circuit
283 Engine Speed Sensor Supply
284 Engine Speed Sensor Supply
285 J1939 Datalink Multiplexing
286 J1939 Datalink Multiplexing
297 OEM Pressure Sensor Circuit
298 OEM Pressure Sensor Circuit
349 Auxiliary Speed or Auxiliary Pressure Input Error
352 Sensor Supply Circuit
361 VP44 Fuel Valve Control High Current
362 VP44 Fuel Valve High Current Error
363 VP44 Fuel Pump Control Valve Feedback Error
364 Electronic Control Module ECM to Pump Communications Error
365 Fuel Pump Voltage Out of Range Error Low
366 VP44 Fuel Pump Voltage Measurement Error
367 VP44 Fuel Pump Speed/Position Sensor Signal Lost
368 VP44 Fuel Pump Can Not Reach Commanded Timing
369 VP44 Fuel Pump To Engine Synchronization Pulse Not Recognized
372 Idle Select High / Low
373 VP44 Fuel Pump Fuel Shut Off Error
374 VP44 Fuel Pump Calibration Error
375 Electronic Control Module ECM Fuel Calibration Corrupted
376 VP44 Fuel Pump rpm and Fuel Error
377 Fuel Pump Power Relay Stuck-On
381 Intake Air Heater Relay Circuit
382 Intake Air Heater Relay Circuit
385 Intake Air Heater Relay Circuit
386 Sensor Supply Circuit
387 Accelerator Position Sensor Circuit
391 VP44 Relay Coil Supply Circuit
415 Oil Pressure Sensor / Switch Circuit Choice
415sn Oil Pressure Sensor Circuit
415sw Oil Pressure Switch Circuit
418 Water-In-Fuel Sensor Circuit
422 Coolant Level Sensor Circuit
429 Water-In-Fuel WIF Sensor Circuit
431 Idle Validation Switch IVS Circuit
432 Accelerator Pedal Circuit ISS
433 Intake Manifold Pressure Sensor Circuit
434 Unswitched Battery Supply Circuit
441 Unswitched Battery Supply Circuit
442 Unswitched Battery Supply Circuit
443 Accelerator Position Sensor Circuit
444 Remote Accelerator Supply Circuit
488 Intake Manifold Air Temperature Sensor – Engine Protection Circuit
489 Auxiliary Speed or Auxiliary Pressure Input Error
515 Coolant Level Sensor Circuit
517 VP44 Fuel Pump Valve Feedback Error
524 Switched Droop Selection Circuit
527 Dual-Output Driver A
528 Alternate Switched Torque Curve Switch Circuit
529 Dual-Output Driver B
768 Output Device Driver Transmission Shift Modulation
779 OEM Input – Engine Protection

CUMMINS ISL & ISC Engine Codes 0-100

0001 Exhaust Gas Pressure Sensor Number 1 Circuit – Voltage Above Normal, or Shorted to High Source
0002 Exhaust Gas Pressure Sensor Number 1 Circuit – Voltage Below Normal, or Shorted to Low Source
0003 Exhaust Gas Pressure Sensor Number 1 Circuit – Data Erratic, Intermittent, or Incorrect
0004 Exhaust Gas Temperature Sensor Number 1 Circuit – Data Erratic, Intermittent, or Incorrect
0005 Exhaust Gas Temperature Sensor Number 1 Circuit – Voltage Below Normal, or Shorted to Low Source
0006 Exhaust Gas Temperature Sensor Number 1 Circuit – Voltage Above Normal, or Shorted to High Source

ISL & ISC Codes 100-200

111 Engine Control Module Critical Internal Failure – Bad Intelligent Device or Component
115 Engine Magnetic Crankshaft Speed/Position Lost Both of Two Signals – Data Erratic, Intermittent, or Incorrect
122 Intake Manifold Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
123 Intake Manifold Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
124 Intake Manifold One Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level
131 Accelerator Pedal or Lever Position Sensor Circuit – Shorted High
132 Accelerator Pedal or Lever Position Sensor Circuit – Voltage Below Normal or Shorted to Low Source
133 Remote Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Above Normal, or Shorted to High Source
134 Remote Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Below Normal, or Shorted to Low Source
135 Oil Pressure Sensor Choice
135auto Oil Pressure Sensor Circuit — Voltage Above Normal or Shorted to High Source
135mar Oil Pressure Sensor Circuit — Voltage Above Normal or Shorted to High Source
141 Oil Pressure Sensor Circuit Choice
141auto Oil Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
141mar Oil Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
143 Oil Pressure Low Choice
143b Oil Pressure Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
143bm Oil Pressure Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
144 Coolant Temperature Sensor Circuit Choice
144b Engine Coolant Temperature 1 Sensor Circuit – Voltage Above Normal or Shorted to High Source
144bm Engine Coolant Temperature 1 Sensor Circuit – Voltage Above Normal or Shorted to High Source
145 Engine Coolant Temperature 1 Sensor Circuit Choice
145b Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source
145bm Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source
146 Engine Coolant Temperature Choice
146b Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level
146bm Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level
147 Accelerator Pedal or Lever Position 1 Sensor Circuit Frequency – Data Valid but Below Normal Operational Range – Most Severe Level
148 Accelerator Pedal or Lever Position Sensor One – Data Valid but Above Normal Operational Range – Most Severe level
151 Engine Coolant Temperature Choice
151b Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Most Severe Level
151bm Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Most Severe Level
153 Intake Manifold Air Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source
154 Intake Manifold Air Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
155 Intake Manifold 1 Temperature Choice
155b Intake Manifold 1 Temperature – Data Valid but Above Normal Operational Range – Most Severe Level
155bm Engine Coolant Temperature 1 Sensor Circuit — Voltage Above Normal or Shorted to High Source
187 Sensor Supply Voltage Number 2 Circuit Choice
187b Sensor Supply Voltage Number 2 Circuit – Voltage Below Normal or Shorted to Low Source
187bm Sensor Supply 2 Circuit – Voltage Below Normal, or Shorted to Low Source
195 Coolant Level Sensor 1 Circuit – Choice
195-2wire Coolant Level Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source
195-3wire Coolant Level Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source
196 Coolant Level Sensor 1 Circuit – Choice
196-2wire Coolant Level Sensor 1 Circuit – Voltage Below Normal or Shorted to Low Source
196-3wire Coolant Level Sensor 1 Circuit – Voltage Below Normal or Shorted to Low Source
197 Coolant Level Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
ISL & ISC Codes 200-300
221 Barometric Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
222 Barometric Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
227 Sensor Supply Voltage Number 2 Circuit Choice
227b Sensor Supply Voltage Number 2 Circuit – Voltage Above Normal or Shorted to High Source
227bm Sensor Supply 2 Circuit – Voltage Above Normal or Shorted to High Source
234 Engine Crankshaft Speed/Position Choice
234b Engine Crankshaft Speed/Position — Data Valid but Above Normal Operational Range – Most Severe Level
234bm Engine Crankshaft Speed/Position — Data Valid but Above Normal Operational Range – Most Severe Level
235 Coolant Level Low – Data Valid but Below Normal Operational Range – Most Severe Level
237 External Speed Command Input (Multiple Unit Synchronization – Data Erratic, Intermittent, or Incorrect
238 Sensor Supply 3 Circuit – Voltage Below Normal, or Shorted to Low Source
241 Vehicle Speed Sensor Circuit – Data Erratic, Intermittent, or Incorrect
242 Vehicle Speed Sensor Circuit Tampering Has Been Detected – Abnormal Rate of Change
245 Fan Control Circuit – Voltage Below Normal or Shorted to Low Source
253 Engine Oil Level – Data Valid But Below Normal Operational Range – Most Severe Level
268 Injector Metering Rail 1 Pressure – Data Erratic, Intermittent, or Incorrect
269 Antitheft Password Valid Indicator – Data Erratic, Intermittent, or Incorrect
271 High Fuel Pressure Solenoid Valve Circuit Choice
271b High Fuel Pressure Solenoid Valve Circuit – Voltage Below Normal or Shorted to Low Source
271cl High Fuel Pressure Solenoid Valve Circuit – Voltage Below Normal or Shorted to Low Source
272 High Fuel Pressure Solenoid Valve Circuit Choice
272b High Fuel Pressure Solenoid Valve Circuit – Voltage Above Normal or Shorted to High Source
272cl High Fuel Pressure Solenoid Valve Circuit – Voltage Above Normal or Shorted to High Source
275 Fuel Pumping Element Number 1 (Front – Mechanical System Not Responding Properly or Out of Adjustment
281 Fault Pump Pressurizing Assembly 1 – Mechanical System Not Responding Properly or Out of Adjustment
284 Engine Speed/Position Sensor (Crankshaft Supply Voltage Circuit – Voltage Below Normal or Shorted to Low Source
285 SAE J1939 Multiplexing PGN Timeout Error – Abnormal Update Rate
286 SAE J1939 Multiplexing Configuration Error – Out of Calibration
287 SAE J1939 Multiplexing Accelerator Pedal or Lever Sensor System Error – Received Network Data Error
288 SAE J1939 Multiplexing Remote Accelerator Pedal or Lever Data Error – Received Network Data Error
291 Proprietary Datalink Error (OEM/Vehicle Datalink – Abnormal Update Rate
292 Auxiliary Temperature Sensor Input 1 – Special Instructions
293 Auxiliary Temperature Sensor Input 1 – Voltage Above Normal, or Shorted to High Source
294 Auxiliary Temperature Sensor Input 1 Circuit – Voltage Below Normal, or Shorted to Low Source
295 Barometric Pressure – Data Erratic, Intermittent, or Incorrect
296 Auxiliary Pressure Sensor Input 1 – Special Instructions
296a Auxiliary Pressure Sensor Input 1 – Special Instructions
296lrv Crankcase Pressure – Data Above Normal Operational Range – Severe Level
297 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Above Normal, or Shorted to High Source
298 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Below Normal, or Shorted to Low Source

ISL & ISC Codes 300-400

319 Real Time Clock Power Interrupt – Data Erratic, Intermittent, or Incorrect
322 Injector Solenoid Driver Cylinder 1 Circuit – Current Below Normal, or Open Circuit
323 Injector Solenoid Driver Cylinder 5 Circuit – Current Below Normal, or Open Circuit
324 Injector Solenoid Driver Cylinder 3 Circuit – Current Below Normal, or Open Circuit
325 Injector Solenoid Driver Cylinder 6 Circuit – Current Below Normal, or Open Circuit
331 Injector Solenoid Cylinder Number 2 Circuit – Current Below Normal or Open Circuit
332 Injector Solenoid Cylinder Number 4 Circuit – Current Below Normal or Open Circuit
334 Engine Coolant Temperature – Data Erratic, Intermittent, or Incorrect
341 Engine Control Module Data Lost – Data Erratic, Intermittent, or Incorrect
342 Electronic Calibration Code Incompatibility – Out of Calibration
343 Engine Control Module Warning Internal Hardware Failure – Bad Intelligent Device or Component
351 Injector Power Supply — Bad Intelligent Device or Component
352 Sensor Supply Voltage Number 1 Circuit – Voltage Below Normal or Shorted to Low Source
386 Sensor Supply Voltage Number 1 Circuit – Voltage Above Normal or Shorted to High Source
387 Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit – Voltage Above Normal or Shorted to High Source

ISL & ISC Codes 400-500

412 SAE J1587/J1922 Data Link – Can Not Transmit
415 Engine Oil Rifle Pressure Choice
415sn Engine Oil Rifle Pressure – Data Valid but Below Normal Operational Range – Most Severe Level
415sw Engine Oil Rifle Pressure – Data Valid but Below Normal Operational Range – Most Severe Level
418 Water-In-Fuel Indicator – Data Valid but Above Normal Operational Range – Least Severe Level
426 SAE J1939 Data Link – Cannot Transmit
427 SAE J1939 Datalink – Abnormal Update Rate
428 Water-In-Fuel Sensor Circuit – Voltage Above Normal or Shorted to High Source
429 Water-In-Fuel Sensor Circuit – Voltage Below Normal or Shorted to Low Source
431 Idle Validation Switch Circuit Choice
431iss Accelerator Pedal or Lever Idle Validation Circuit – Data Erratic, Intermittent, or Incorrect
431niss Accelerator Pedal or Lever Idle Validation Circuit – Data Erratic, Intermittent, or Incorrect
431sss Accelerator Pedal or Lever Idle Validation Circuit – Data Erratic, Intermittent, or Incorrect
432 Accelerator Pedal or Lever Idle Validation Circuit – Out of Calibration
433 Intake Manifold Pressure Sensor Circuit – Data Incorrect
434 Power Supply Lost With Ignition On – Data Erratic, Intermittent or Incorrect
435 Oil Pressure Switch Sensor Circuit – Data Erratic, Intermittent or Incorrect
436 Intake Manifold 1 Temperature – Data Erratic, Intermittent, or Incorrect
441 Battery 1 Voltage – Data Valid but Below Normal Operational Range – Moderately Severe Level
442 Battery 1 Voltage – Data Valid but Below Normal Operational Range – Moderately Severe Level
443 Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit — Voltage Below Normal or Shorted to Low Source
449 Fuel Pressure High Choice
449b Injector Metering Rail Number 1 Pressure – Data Valid But Above Normal Operating Range – Most Severe Level
449cl Injector Metering Rail Number 1 Pressure – Data Valid But Above Normal Operating Range – Most Severe Level
451 Injector Metering Rail Number 1 Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
452 Injector Metering Rail Number 1 Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
471 Engine Oil Level – Data Valid But Below Normal Operational Range – Least Severe Level
488 Intake Manifold 1 Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level
497 Multiple Unit Synchronization Switch – Data Erratic, Intermittent, or Incorrect
498 Engine Oil Level Sensor Circuit – Voltage Above Normal, or Shorted to High Source
499 Engine Oil Level Sensor Circuit – Voltage Below Normal, or Shorted to Low Source

ISL & ISC Codes 500-600

523 Auxiliary Intermediate (PTO Speed Switch Validation – Data Erratic, Intermittent, or Incorrect0
527 Auxiliary Input/Out Two Circuit Voltage Above Normal or Shorted to High Source
528 Auxiliary Alternate Torque Validation Switch – Data Erratic, Intermittent, or Incorrect
529 Auxiliary Input/Output Three Circuit – Voltage Above Normal, or Shorted to High Source
545 Turbocharger 1 Wastegate Control – Mechanical System Not Responding Properly or Out of Adjustment
551 Idle Validation Switch Circuit Choice
551iss Accelerator Pedal or Lever Idle Validation Circuit – Voltage Below Normal or Shorted to Low Source
551niss Accelerator Pedal or Lever Idle Validation Circuit – Voltage Below Normal or Shorted to Low Source
551sss Accelerator Pedal or Lever Idle Validation Circuit – Voltage Below Normal or Shorted to Low Source
553 Injector Metering Rail One Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level
554 Injector Metering Rail 1 Pressure – Data Erratic, Intermittent, or Incorrect
559 Fuel Pump Delivery Pressure Low Choice
559b Fuel Pump Delivery Pressure Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
559cl Injector Metering Rail 1 Pressure – Data Valid but Below Normal Operational Range – Moderately Severe Level
584 Starter Relay Circuit – Voltage Above Normal or Shorted to High Source
585 Starter Relay Circuit – Voltage Below Normal or Shorted to Low Source
595 Turbocharger Number 1 Speed High Choice
595b Turbocharger Number 1 Speed High – Warning Level
595cl Turbocharger Number 1 Speed High – Data Valid but Above Normal Operational Range – Moderately Severe Level
596 Electrical Charging System Voltage High – Data Valid but Above Normal Operational Range – Moderately Severe Level
597 Electrical Charging System Voltage Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
598 Electrical Charging System Voltage Low – Data Valid but Below Normal Operational Range – Most Severe Level
599 Auxiliary Commanded Dual Output Shutdown – Special Instructions

ISL & ISC Codes 600-700

649 Change Lubricating Oil and Filter – Condition Exists
687 Turbocharger Speed Sensor Choice
687b Turbocharger Speed Sensor – Below Normal Operating Range
687cl Turbocharger Number 1 Speed Low – Data Valid but Below Normal Operating Range – Moderately Severe Level
688 Engine Oil Level – Data Valid But Above Normal Operational Range – Most Severe Level
689 Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect
691 Turbocharger Number 1 Compressor Inlet Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source
692 Turbocharger Number 1 Compressor Inlet Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source

ISL & ISC Codes 700-900

731 Engine Speed/Position Sensors Choice
731b Engine Speed Sensor/Position Camshaft and Crankshaft Misalignment – Mechanical System Not Responding Properly or Out of Adjustment
731bm Engine Speed Sensor/Position Camshaft and Crankshaft Misalignment – Mechanical System Not Responding Properly or Out of Adjustment
757 Electronic Control Module Data Lost – Condition Exists
778 Engine Speed Sensor (Camshaft Error – Data Erratic, Intermittent or Incorrect
779 Auxiliary Equipment Sensor Input Number 3 (OEM Switch – Root Cause Not Known)
784 Adaptive Cruise Control – Error
951 Cylinder Power Imbalance Detected
957 EGR Valve Position – Data Erratic, Intermittent, or Incorrect
958 VGT Position Sensor – Data Erratic, Intermittent, or Incorrect
1117 Power Lost Without Ignition Off Choice
1117auto Power Lost Without Ignition Off – Data Erratic, Intermittent or Incorrect
1117mar Power Lost Without Ignition Off – Data Erratic, Intermittent or Incorrect
1139 Injector Solenoid Driver Cylinder 1 – Mechanical System Not Responding Properly or Out of Adjustment
1141 Injector Solenoid Driver Cylinder 2 – Mechanical System Not Responding Properly or Out of Adjustment
1142 Injector Solenoid Driver Cylinder 3 – Mechanical System Not Responding Properly or Out of Adjustment
1143 Injector Solenoid Driver Cylinder 4 – Mechanical System Not Responding Properly or Out of Adjustment
1144 Injector Solenoid Driver Cylinder 5 – Mechanical System Not Responding Properly or Out of Adjustment
1145 Injector Solenoid Driver Cylinder 6 – Mechanical System Not Responding Properly or Out of Adjustment

ISL & ISC Codes 1200-1600

1228 EGR Valve Position – Data Erratic, Intermittent, or Incorrect
1229 VGT Position Sensor – Data Erratic, Intermittent, or Incorrect
1239 Accelerator Pedal or Lever Position Sensor 2 Circuit – Voltage Above Normal or Shorted to High Source
1241 Accelerator Pedal or Lever Position Sensor 2 Circuit – Voltage Below Normal or Shorted to Low Source
1242 Accelerator Pedal or Lever Position Sensor 1 and 2 – Data Erratic, Intermittent, or Incorrect

ISL & ISC Codes 1600-1700

1633 Komnet Datalink Cannot Transmit – Data Erratic, Intermittent, or Incorrect
1639 Auxiliary Equipment Sensor Input Number 3 (OEM Switch – Root Cause Not Known
1654 Engine Misfire Cylinder 1 – Condition Exists
1655 Engine Misfire Cylinder 2 – Condition Exists
1656 Engine Misfire Cylinder 3 – Condition Exists
1657 Engine Misfire Cylinder 4 – Condition Exists
1658 Engine Misfire Cylinder 5 – Condition Exists
1659 Engine Misfire Cylinder 6 – Condition Exists
1663 Catalyst Inlet Temperature Sensor Swapped with Outlet – Condition Exists
1664 Catalyst Missing – Condition Exists
1665 Exhaust Gas Temperature 1 Circuit – Voltage Below Normal, or Shorted to Low Source
1666 Exhaust Gas Temperature Circuit 1 – Voltage Above Normal, or Shorted to Low Source
1667 Exhaust Gas Temperature 1 – Data Erratic, Intermittent, or Incorrect
1668 Catalyst Tank Level Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
1669 Catalyst Tank Level Sensor Circuit – Voltage Above Normal, or Shorted to High Source
1671 Catalyst Tank Level – Data Valid but Below Normal Operational Range – Moderately Severe Level.
1673 Catalyst Tank Level – Data Erratic, Intermittent, or Incorrect
1674 Exhaust Gas Temperature 2 Circuit – Voltage Below Normal, or Shorted to Low Source
1675 Exhaust Gas Temperature 2 Circuit – Voltage Above Normal, or Shorted to Low Source
1676 Exhaust Gas Temperature 2 – Data Erratic, Intermittent, or Incorrect
1677 Catalyst Tank Temperature – Voltage Below Normal, or Shorted to Low Source
1678 Catalyst Tank Temperature – Voltage Above Normal, or Shorted to High Source
1679 Catalyst Tank Temperature – Data Erratic, Intermittent, or Incorrect
1681 Dosing Control Unit – Bad Intelligent Device or Component
1682 Catalyst Reagent Dosing Unit Input Lines – Condition Exists
1683 Catalyst Tank Heater Circuit – Voltage Above Normal, or Shorted to High Source
1684 Catalyst Tank Heater Circuit – Voltage Above Normal, or Shorted to High Source
1687 Catalyst Over Temperature – Data Valid but Above Normal Operational Range – Most Severe Level
1689 Real-Time Clock Power Interrupt – Data Erratic, Intermittent or Incorrect
1692 Aftertreatment Outlet NOx Sensor – Voltage Below Normal or Shorted to Low Source
1694 Aftertreatment Outlet NOx Sensor – Data Erratic, Intermittent, or Incorrect
1697 Aftertreatment #1 Air Enable Actuator – Voltage Above Normal, or Shorted to High Source
1698 Aftertreatment #1 Air Enable Actuator – Voltage Below Normal, or Shorted to Low Source
1699 Catalyst Tank Level Sensor – Data Erratic, Intermittent, or Incorrect

ISL & ISC Codes 1700-1800

1711 Dosing Control Unit Datalink – Abnormal Update Rate
1712 Catalyst Tank Heater Circuit – Data Valid But Below Normal Operating Range – Moderately Severe Level
1713 Catalyst Tank Heater Circuit – Data Valid But Above Normal Operating Range – Moderately Severe Level
1716 Auxiliary Temperature Sensor Input 1 Circuit – Root Cause Not Known
1717 Exhaust Gas Temperature 1 – Data Valid but Above Normal Operational Range – Least Severe Level
1718 Engine Misfire for Multiple Cylinders – Condition Exists

ISL & ISC Codes 1800-2000

1848 Intake Manifold 1 Temperature – Abnormal Rate of Change
1849 Exhaust Gas Temperature 1 – Abnormal Rate of Change
1851 Exhaust Gas Temperature 2 – Abnormal Rate of Change
1892 Wheel-Based Vehicle Speed – Data Valid but Below Normal Operational Range – Moderately Severe Level
1911 Injector Metering Rail 1 Pressure – Data Valid but Above Normal Operational Range – Most Severe Level
ISL & ISC Codes 2000-2200 2183 Engine Brake Actuator Driver 1 Circuit – Voltage Below Normal, or Shorted to Low Source
2185 Sensor Supply Voltage 4 Circuit – Voltage Above Normal or Shorted to High Source
2186 Sensor Supply Voltage 4 Circuit – Voltage Below Normal or Shorted to Low Source

ISL & ISC Codes 2200-2300

2215 Fuel Pump Delivery Pressure Low Choice
2215b Fuel Pump Delivery Pressure Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
2215cl Fuel Pump Delivery Pressure Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
2216 Fuel Pump Delivery Pressure High Choice
2216b Fuel Pump Delivery Pressure High – Data Valid but Above Normal Operational Range – Moderately Severe Level
2216cl Fuel Pump Delivery Pressure High – Data Valid but Above Normal Operational Range – Moderately Severe Level
2217 Engine Control Module Calibration Program Memory (RAM Corruption – Condition Exists
2249 Injector Metering Rail 1 Pressure – Data Valid but Below Normal Operational Range – Most Severe Level
2265 Electric Lift Pump for Engine Fuel Supply Circuit – Voltage Above Normal or Shorted to High Source
2266 Electric Lift Pump for Engine Fuel Supply Circuit – Voltage Below Normal or Shorted to Low Source
2271 EGR Valve Position Sensor Circuit – Voltage Above Normal or shorted to High Source
2272 EGR Valve Position Sensor Circuit – Voltage Below normal or Shorted to Low Source
2273 EGR Valve Differential Pressure Sensor Circuit – Shorted High
2274 EGR Valve Differential Pressure Sensor Circuit – Shorted Low
2292 Fuel Inlet Meter Device – Data Valid but Above Normal Operational Range – Moderately Severe Level
2293 Fuel Inlet Meter Device Flow Demand Lower Than Expected – Data Valid but Below Normal Operational Range – Moderately Severe Level

ISL & ISC Codes 2300-2500

2311 Fueling Actuator Number 1 Circuit Error Conditions Exists
2321 Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect
2322 Backup Engine Speed/Position Sensor Number 2 – Data Erratic, Intermittent, or Incorrect
2345 Turbocharger Speed Choice
2345b Turbocharger Speed – Invalid Rate of Change Detected
2345cl Turbocharger Speed Invalid Rate of Change detected – Abnormal Rate of Change
2346 Exhaust Gas Temperature Choice
2346b Exhaust Gas Temperature – Data Above Normal
2346cl Turbocharger Turbine Inlet Temperature (Calculated – Data Valid but Above Normal Operational Range – Least Severe Level
2347 Turbocharger Compressor Outlet Temperature Choice
2347b Turbocharger Compressor Outlet Temperature – Data Above Normal
2347cl Turbocharger Compressor Outlet Air Temperature (Calculated – Data Valid but Above Normal Range
2348 EGR Valve Failed Automatic Calibration Procedure
2349 EGR Valve Control Circuit – Current Below Normal or Open Circuit
2351 EGR Valve Control Circuit – Voltage Below Normal or Shorted to Low Source
2352 EGR Valve Control Circuit – Voltage Above Normal or Shorted to High Source
2353 EGR Valve Control Circuit – Current Above Normal or Grounded Circuit
2357 EGR Valve Control – Mechanical System Not Responding Properly or Out of Adjustment
2359 EGR Differential Pressure Sensor – Data Valid But Above Normal Operating Range – Moderately Severe Level
2362 Engine Brake Actuator Circuit Number 1 – Voltage Below Normal or Shorted to Low Source
2363 Engine Brake Actuator Circuit Number 2 – Voltage Below Normal or Shorted to Low Source
2366 Engine Brake Actuator Circuit Number 1 – Voltage Above Normal or Shorted to High Source
2367 Engine Brake Actuator Circuit Number 2 – Voltage Above Normal or Shorted to High Source
2373 Exhaust Gas Pressure Sensor Circuit – Shorted High
2374 Exhaust Gas Pressure Sensor Circuit – Shorted Low
2375 Exhaust Gas Recirculation (EGR Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source
2376 Recirculation Exhaust Gas Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
2377 Fan Control Circuit – Voltage Above Normal or Shorted to High Source
2381 Turbocharger Position Sensor Circuit – Shorted High
2382 Turbocharger Position Sensor Circuit – Shorted Low
2383 Variable Geometry Turbocharger Actuator Circuit – Current Below Normal, or Open Circuit
2384 VGT Actuator Choice
2384b VGT Actuator – Voltage Below Normal or Shorted to Low Source
2384cl VGT Actuator Driver Circuit – Voltage Below Normal, or Shorted to Low Source
2385 VGT Actuator Choice
2385b VGT Actuator – Voltage Above Normal or Shorted to High Source
2385cl VGT Actuator Driver Circuit – Voltage Above Normal, or Shorted to High Source
2386 Turbocharger Actuator Motor Circuit – Current Above Normal
2387 Turbocharger Actuator Motor – Mechanical System Not Responding Properly
2388 Variable Geometry Turbocharger Actuator Position Failed Automatic Calibration Procedure – Out of Calibration

ISL & ISC Codes 2500-2800

2554 Exhaust Pressure Sensor Circuit – Data Erratic, Intermittent, or Incorrect
2555 Intake Air Heater Number 1 Circuit – Voltage Above Normal or Shorted to High Source
2556 Intake Air Heater Number 1 Circuit – Voltage Below Normal or Shorted to Low Source
2557 Auxiliary PWM Driver Number 1 – Voltage Above Normal or Shorted to High Source
2558 Auxiliary PWM Driver Number 1 – Voltage Below Normal or Shorted to Low Source
2659 Engine Coolant Temperature – Condition Exists
2771 Aftertreatment Outlet NOx Sensor – Abnormal Update Rate
2772 Aftertreatment Outlet NOx – Data Valid but Above Normal Operational Range – Least Severe Level
2773 Aftertreatment Outlet NOx – Data Valid but Above Normal Operational Range – Most Severe Level

ISL & ISC Codes 2800-3000

2961 EGR Temperature – Data Valid But Above Normal Operating Range, Least Severe Level
2962 EGR Temperature – Data Valid But Above Normal Operating Range, Moderately Severe Level
2963 Engine Coolant Temperature High – Data Valid but Above Normal Operational Range – Least Severe Level
2964 Intake Manifold Temperature High – Data Valid but Above Normal Operational Range – Least Severe Level
2973 Intake Manifold Pressure Sensor Circuit – Data Erratic, Intermittent or Incorrect
2976 Dosing Control Unit Temperature – Data Erratic, Intermittent, or Incorrect

ISL & ISC Codes 9000-9122

9121 EGR Valve Actuator Over Temperature (Calculated – Data Above Normal Range
9122 Variable Geometry Turbocharger Actuator Over Temperature

CUMMINS ISM Engine Fault Codes DTC

111 Engine Control Module Critical Internal Failure – Bad Intelligent Device or Component
122 Intake Manifold Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
123 Intake Manifold Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
131 Accelerator Pedal Position Sensor Circuit – Shorted High
132 Accelerator Pedal or Lever Position Sensor Circuit – Voltage Below Normal or Shorted to Low Source
133 Remote Accelerator Pedal or Lever Position Sensor Circuit – Voltage Above Normal, or Shorted to High Source
134 Remote Accelerator Pedal or Lever Position Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
135 Oil Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
141 Oil Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
143 Oil Pressure Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
144 Coolant Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source
145 Coolant Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
151 Coolant Temperature High – Data Valid but Above Normal Operational Range – Most Severe Level
153 Intake Manifold Air Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source
154 Intake Manifold Air Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
155 Intake Manifold Air Temperature High – Data Valid but Above Normal Operational Range – Most Severe Level
187 Sensor Supply Voltage Number 2 Circuit – Voltage Below Normal or Shorted to Low Source
195 Coolant Level Sensor Circuit – Choice
195-2wire Coolant Level Sensor Circuit — Voltage Above Normal or Shorted to High Source
195-3wire Coolant Level Sensor Circuit — Voltage Above Normal or Shorted to High Source
196 Coolant Level Sensor Circuit – Choice
196-2wire Coolant Level Sensor Circuit — Voltage Below Normal or Shorted to Low Source
196-3wire Coolant Level Sensor Circuit — Voltage Below Normal or Shorted to Low Source
197 Coolant Level Low – Data Valid but Below Normal Operational Range – Moderately Severe Level

ISM Codes 200 – 300

212 Oil Temperature Sensor Circuit – Voltage Above Normal, or Shorted to High Source
213 Oil Temperature Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
214 Oil Temperature High – Data Valid but Above Normal Operational Range – Most Severe Level
219 Oil Level Number 2 (Remote Low – Data Valid but Below Normal Operational Range – Least Severe Level
221 Barometric Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
222 Barometric Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
223 Oil Burn Valve Solenoid Circuit – Voltage Below Normal, or Shorted to Low Source
224 Oil Burn Valve Solenoid Circuit – Voltage Above Normal, or Shorted to High Source
227 Sensor Supply Voltage Number 2 Circuit – Voltage Above Normal or Shorted to High Source
234 Engine Speed High – Data Valid but Above Normal Operational Range – Most Severe Level
235 Coolant Level Low – Data Valid but Below Normal Operational Range – Most Severe Level
241 Vehicle Speed Sensor Circuit – Data Erratic, Intermittent, or Incorrect
242 Vehicle Speed Sensor Circuit Tampering Has Been Detected – Abnormal Rate of Change
245 Fan Control Circuit – Voltage Below Normal or Shorted to Low Source
249 Ambient Air Temperature Sensor Circuit – Voltage Above Normal, or Shorted to High Source
254 Fuel Shutoff Valve Circuit – Voltage Below Normal, or Shorted to Low Source
255 Fuel Shutoff Valve Circuit – Voltage Above Normal, or Shorted to High Source
256 Ambient Air Temperature Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
259 Engine Fuel Shutoff Valve Stuck Open – Mechanical System not Responding Properly or Out of Adjustment
285 SAE J1939 Multiplexing PGN Timeout Error – Abnormal Update Rate
286 SAE J1939 Multiplexing Configuration Error – Out of Calibration
287 SAE J1939 Multiplexing Accelerator Pedal or Lever Sensor System Error – Received Network Data Error
288 SAE J1939 Multiplexing Remote Accelerator Pedal or Lever Data Error – Received Network Data Error
295 Barometric Air Pressure Sensor Circuit – Data Erratic, Intermittent, or Incorrect

ISM Codes 300 – 400

311 Injector Solenoid Cylinder Number 1 Circuit – Current Above Normal, or Grounded Circuit
312 Injector Solenoid Cylinder Number 5 Circuit – Current Above Normal, or Grounded Circuit
313 Injector Solenoid Cylinder Number 3 Circuit – Current Above Normal, or Grounded Circuit
314 Injector Solenoid Cylinder Number 6 Circuit – Current Above Normal, or Grounded Circuit
315 Injector Solenoid Cylinder Number 2 Circuit – Current Above Normal, or Grounded Circuit
321 Injector Solenoid Cylinder Number 4 Circuit – Current Above Normal, or Grounded Circuit
322 Injector Solenoid Cylinder Number 1 Circuit – Current Below Normal or Open Circuit
323 Injector Solenoid Cylinder Number 5 Circuit – Current Below Normal or Open Circuit
324 Injector Solenoid Cylinder Number 3 Circuit – Current Below Normal or Open Circuit
325 Injector Solenoid Cylinder Number 6 Circuit – Current Below Normal or Open Circuit
331 Injector Solenoid Cylinder Number 2 Circuit – Current Below Normal or Open Circuit
332 Injector Solenoid Cylinder Number 4 Circuit – Current Below Normal or Open Circuit
338 Idle Shutdown Vehicle Accessories Relay Circuit – Voltage Above Normal, or Shorted to High Source
339 Idle Shutdown Vehicle Accessories Relay Circuit – Voltage Below Normal, or Shorted to Low Source
341 Engine Control Module Data Lost – Data Erratic, Intermittent, or Incorrect
343 Engine Control Module Warning Internal Hardware Failure – Bad Intelligent Device or Component
352 Sensor Supply Voltage Number 1 Circuit – Voltage Below Normal or Shorted to Low Source
386 Sensor Supply Voltage Number 1 Circuit – Voltage Above Normal or Shorted to High Source
387 Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit – Voltage Above Normal or Shorted to High Source

ISM Codes 400 – 500

415 Oil Pressure Low – Data Valid but Below Normal Operational Range – Most Severe Level
418 Water-In-Fuel Indicator High – Data Valid but Above Normal Operational Range – Least Severe Level
428 Water-In-Fuel Sensor Circuit – Voltage Above Normal or Shorted to High Source
429 Water-In-Fuel Sensor Circuit – Voltage Below Normal or Shorted to Low Source
431 Idle Validation Switch Circuit Choice
431iss Idle Validation Switch Circuit – Integrated Switch and Sensor Type
431niss Idle Validation Switch Circuit – Non-Integrated Switch and Sensor Type
431sss Idle Validation Switch Circuit – Solid-State Switch and Sensor Type
432 Accelerator Pedal or Lever Idle Validation Circuit – Out of Calibration
433 Intake Manifold Pressure Sensor Circuit – Data Erratic, Intermittent, or Incorrect
434 Power Lost without Ignition Off – Data Erratic, Intermittent, or Incorrect
435 Oil Pressure Sensor Circuit – Data Erratic, Intermittent, or Incorrect
443 Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit – Voltage Below Normal or Shorted to Low Source

ISM Codes 500 – 600

551 Idle Validation Switch Circuit Choice
551iss Idle Validation Switch Circuit – Integrated Switch and Sensor Type
551niss Idle Validation Switch Circuit – Non-Integrated Switch and Sensor Type
551sss Idle Validation Switch Circuit – Solid-State Switch and Sensor Type
584 Starter Relay Circuit – Voltage Above Normal or Shorted to High Source
585 Starter Relay Circuit – Voltage Below Normal or Shorted to Low Source
595 Turbocharger Number 1 Speed High – Data Valid but Above Normal Operational Range – Moderately Severe Level
596 Electrical Charging System Voltage High – Data Valid but Above Normal Operational Range – Moderately Severe Level
597 Electrical Charging System Voltage Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
598 Electrical Charging System Voltage Low – Data Valid but Below Normal Operational Range – Most Severe Level

ISM Codes 600- 1000

649 Change Lubricating Oil and Filter – Condition Exists
687 Turbocharger Number 1 Speed Low – Data Valid but Below Normal Operational Range – Moderately Severe Level
689 Primary Engine Speed Sensor Error – Data Erratic, Intermittent, or Incorrect
691 Turbocharger Number 1 Compressor Inlet Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source
692 Turbocharger Number 1 Compressor Inlet Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
778 Engine Speed Sensor (Camshaft Error – Data Erratic, Intermittent or Incorrect)
784 Loss of Communication with Adaptive Cruise Control – Data Erratic, Intermittent or Incorrect
951 Cylinder Power Imbalance Between Cylinders – Data Erratic, Intermittent, or Incorrect

ISM Codes 1000 – 9121

1119 Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level
1137 Hall Effect Speed Sensors Connected Incorrectly – Condition Exists
1228 EGR Valve Position Sensor Circuit – Data Erratic, Intermittent, or Incorrect
1943 Ambient Air Density – Data Valid But Below Normal Operational Range – Least Severe Level
2197 (OEM Temperature Sensor Engine Protection Warning – Root Cause Not Known
2271 EGR Valve Position Circuit – Voltage Above Normal, or Shorted to High Source
2272 EGR Valve Position Circuit – Voltage Below Normal, or Shorted to Low Source
2273 EGR Valve Delta Pressure Sensor Circuit – Voltage Above Normal, or Shorted to High Source
2274 EGR Valve Delta Pressure Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
2346 Turbocharger Turbine Inlet Temperature (Calculated – Data Valid but Above Normal Operational Range – Least Severe Level
2347 Turbocharger Compressor Outlet Temperature (Calculated – Data Valid but Above Normal Operational Range – Least Severe Level)
2348 EGR Valve Position Failed Automatic Calibration Procedure – Out of Calibration
2349 EGR Valve Control Circuit – Current Below Normal, or Open Circuit
2351 EGR Valve Control Circuit – Voltage Below Normal, or Shorted to Low Source
2352 EGR Valve Control Circuit – Voltage Above Normal, or Shorted to High Source
2353 EGR Valve Control Circuit – Current Above Normal, or Grounded Circuit
2357 EGR Valve Control – Mechanical System Not Responding Properly, or Out of Adjustment
(105-fc2359 EGR Differential Pressure Sensor – Data Valid but Above Normal Operating Range – Moderately Severe Level)
2362 Engine Brake Actuator Circuit Number 1 – Voltage Below Normal or Shorted to Low Source
2363 Engine Brake Actuator Circuit Number 2 – Voltage Below Normal or Shorted to Low Source
2366 Engine Brake Actuator Circuit Number 1 – Voltage Above Normal or Shorted to High Source
2367 Engine Brake Actuator Circuit Number 2 – Voltage Above Normal or Shorted to High Source
2373 Exhaust Pressure Sensor Circuit – Voltage Above Normal, or Shorted to High Source
2374 Exhaust Pressure Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
2375 EGR Gas Temperature Sensor Circuit – Voltage Above Normal, or Shorted to High Source
2376 EGR Gas Temperature Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
2377 Fan Control Circuit – Voltage Above Normal or Shorted to High Source
2384 VGT Actuator – Voltage Below Normal or Shorted to Low Source
2385 VGT Actuator – Voltage Above Normal or Shorted to High Source
2554 Exhaust Pressure Sensor Circuit – Data Erratic, Intermittent or Incorrect
2961 EGR Temperature – Data Valid but Above Normal Operational Range – Least Severe Level
2962 EGR Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level
2963 Engine Coolant Temperature High – Data Valid but Above Normal Operational Range – Least Severe Level
2964 Intake Manifold Temperature High – Data Valid but Above Normal Operational Range – Least Severe Level
2973 Intake Manifold Pressure Sensor Circuit – Data Erratic, Intermittent or Incorrect
9121 EGR Valve Actuator Over Temperature (Calculated – Data Valid but Above Normal Operational Range – Least Severe Level)

ISX Engine Fault Codes 111-500

111 Electronic Control Module Critical Internal Failure – Bad Intelligent Device or Component
115 Engine Magnetic Speed / Position Lost Both of Two Signals – Data Erratic, Intermittent, or Incorrect
122 Intake Manifold 1 Pressure Sensor Circuit – Voltage Above Normal, or Shorted to High Source
123 Intake Manifold 1 Pressure Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
125 Intake Manifold 1 Pressure – Data Valid but Below Normal Operational Range – Moderately Severe Level
131 Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Above Normal, or Shorted to High Source
132 Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Below Normal or Shorted to Low Source
133 Remote Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Above Normal, or Shorted to High Source
134 Remote Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Below Normal, or Shorted to Low Source
135 Engine Oil Rifle Pressure 1 Sensor Circuit – Voltage Above Normal, or Shorted to High Source
141 Engine Oil Rifle Pressure 1 Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
143 Engine Oil Rifle Pressure – Data Valid but Below Normal Operational Range – Moderately Severe Level
144 Engine Coolant Temperature 1 Sensor Circuit – Voltage Above Normal, or Shorted to High Source
145 Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
146 Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level
151 Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Most Severe Level
153 Intake Manifold 1 Temperature Sensor Circuit – Voltage Above Normal, or Shorted to High Source
154 Intake Manifold 1 Temperature Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
155 Intake Manifold 1 Temperature – Data Valid but Above Normal Operational Range – Most Severe Level
187 Sensor Supply 2 Circuit Choice
187ism Sensor Supply 2 Circuit – Voltage Below Normal, or Shorted to Low Source
187isx Sensor Supply 2 Circuit – Voltage Below Normal, or Shorted to Low Source
195 Coolant Level Sensor 1 Circuit Choice
195-2wire Coolant Level Sensor 1 Circuit – Voltage Above Normal, or Shorted to High Source
195-3wire Coolant Level Sensor 1 Circuit – Voltage Above Normal, or Shorted to High Source
196 Coolant Level Sensor 1 Circuit Choice
196-2wire Coolant Level Sensor 1 Circuit – Voltage Below Normal, or Shorted to Low Source
196-3wire Coolant Level Sensor 1 Circuit – Voltage Below Normal, or Shorted to Low Source
197 Coolant Level – Data Valid but Below Normal Operational Range – Moderately Severe Level
212 Engine Oil Temperature Sensor 1 Circuit – Voltage Above Normal, or Shorted to High Source
213 Engine Oil Temperature Sensor 1 Circuit — Voltage Below Normal, or Shorted to Low Source
214 Engine Oil Temperature High – Data Valid but Above Normal Operational Range – Most Severe Level
221 Barometric Pressure Sensor Circuit – Voltage Above Normal, or Shorted to High Source
222 Barometric Pressure Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
227 Sensor Supply 2 Circuit – Voltage Above Normal, or Shorted to High Source
234 Engine Crankshaft Speed/Position – Data Valid but Above Normal Operational Range – Most Severe Level
238 Sensor Supply 3 Circuit – Voltage Below Normal, or Shorted to Low Source
241 Wheel-Based Vehicle Speed – Data Erratic, Intermittent or Incorrect
242 Wheel-Based Vehicle Speed Sensor Circuit Tampering Has Been Detected – Abnormal Rate of Change
245 Fan Control Circuit – Voltage Below Normal or Shorted to Low Source
249 Ambient Air Temperature Sensor 1 Circuit – Voltage Above Normal, or Shorted to High Source
254 Engine Fuel Shutoff Valve Driver Circuit – Voltage Below Normal, or Shorted to Low Source
255 Engine Fuel Shutoff Valve Driver Circuit – Voltage Above Normal, or Shorted to High Source
256 Ambient Air Temperature Sensor 1 Circuit – Voltage Below Normal, or Shorted to Low Source
257 Engine Fuel shutoff Valve Driver – Mechanical System Not Responding Properly or Out of Adjustment
263 Engine Fuel Temperature Sensor 1 Circuit – Voltage Above Normal, or Shorted to High Source
265 Engine Fuel Temperature Sensor 1 Circuit – Voltage Below Normal, or Shorted to Low Source
285 SAE J1939 Multiplexing PGN Timeout Error – Abnormal Update Rate
286 SAE J1939 Multiplexing Configuration Error – Out of Calibration
287 SAE J1939 Multiplexed Accelerator Pedal or Lever Sensor System – Received Network Data In Error
288 SAE J1939 Multiplexing Remote Accelerator Pedal or Lever Position Sensor System – Received Network Data In Error
295 Barometric Pressure – Data Erratic, Intermittent, or Incorrect
311 Injector Solenoid Driver Cylinder 1 Circuit – Current Above Normal, or Grounded Circuit
312 Injector Solenoid Driver Cylinder 5 Circuit – Current Above Normal, or Grounded Circuit
313 Injector Solenoid Driver Cylinder 3 Circuit – Current Above Normal, or Grounded Circuit
314 Injector Solenoid Driver Cylinder 6 Circuit – Current Above Normal, or Grounded Circuit
315 Injector Solenoid Driver Cylinder 2 Circuit – Current Above Normal, or Grounded Circuit
319 Real Time Clock Power Interrupt – Data Erratic, Intermittent, or Incorrect
321 Injector Solenoid Driver Cylinder 4 Circuit – Current Above Normal, or Grounded Circuit
322 Injector Solenoid Driver Cylinder 1 Circuit – Current Below Normal, or Open Circuit
323 Injector Solenoid Driver Cylinder 5 Circuit – Current Below Normal, or Open Circuit
324 Injector Solenoid Driver Cylinder 3 Circuit – Current Below Normal, or Open Circuit
325 Injector Solenoid Driver Cylinder 6 Circuit – Current Below Normal, or Open Circuit
331 Injector Solenoid Driver Cylinder 2 Circuit – Current Below Normal, or Open Circuit
332 Injector Solenoid Driver Cylinder 4 Circuit – Current Below Normal, or Open Circuit
338 Idle Shutdown Vehicle Accessories Relay Driver Circuit – Voltage Above Normal, or Shorted to High Source
339 Idle Shutdown Vehicle Accessories Relay Driver Circuit – Voltage Below Normal, or Shorted to Low Source
343 Engine Control Module Warning Internal Hardware Failure – Bad Intelligent Device or Component
346 Engine Control Module Calibration Memory Software – Bad Intelligent Device or Component
351 Injector Power Supply – Bad Intelligent Device or Component
352 Sensor Supply 1 Circuit – Voltage Below Normal, or Shorted to Low Source
386 Sensor Supply 1 Circuit – Voltage Above Normal, or Shorted to High Source
415 Engine Oil Rifle Pressure – Data Valid but Below Normal Operational Range – Most Severe Level
418 Water in Fuel Indicator – Data Valid but Above Normal Operational Range – Least Severe Level
427 SAE J1939 Datalink – Abnormal Update Rate
428 Water-in-Fuel Indicator Sensor Circuit – Voltage Above Normal, or Shorted to High Source
429 Water-in-Fuel Indicator Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
435 Engine Oil Rifle Pressure – Data Erratic, Intermittent, or Incorrect
441 Battery 1 Voltage – Data Valid but Below Normal Operational Range – Moderately Severe Level
442 Battery 1 Voltage – Data Valid but Above Normal Operational Range – Moderately Severe Level

ISX Codes 500-1000

546 Fuel Delivery Pressure Sensor Circuit – Voltage Above Normal, or Shorted to High Source
547 Fuel Delivery Pressure Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
555 Crankcase Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level
556 Crankcase Pressure — Data Valid but Above Normal Operational Range — Most Severe Level
584 Starter Relay Driver Circuit – Voltage Above Normal, or Shorted to High Source
585 Starter Relay Driver Circuit – Voltage Below Normal, or Shorted to Low Source
596 Electrical Charging System Voltage – Data Valid but Above Normal Operational Range – Moderately Severe Level
597 Electrical Charging System Voltage – Data Valid but Below Normal Operational Range – Moderately Severe Level
598 Electrical Charging System Voltage – Data Valid but Below Normal Operational Range – Most Severe Level
649 Engine Oil Change Interval – Condition Exists
686 Turbocharger 1 Speed – Data Erratic, Intermittent, or Incorrect
687 Turbocharger 1 Speed – Data Valid but Below Normal Operational Range – Moderately Severe Level
689 Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect
689ism Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect
689isx Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect
691 Turbocharger 1 Compressor Inlet Temperature Sensor Circuit – Voltage Above Normal, or Shorted to High Source
692 Turbocharger 1 Compressor Inlet Temperature Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
697 ECM Internal Temperature Sensor Circuit – Voltage Above Normal, or Shorted to High Source
698 ECM Internal Temperature Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
731 Engine Speed / Position Camshaft and Crankshaft Misalignment – Mechanical System Not Responding Properly or Out of Adjustment
778 Engine Camshaft Speed/Position Sensor Choice
778ism Engine Camshaft Speed/Position Sensor – Data Erratic, Intermittent, or Incorrect
778isx Engine Camshaft Speed/Position Sensor – Data Erratic, Intermittent, or Incorrect
784 Adaptive Cruise Control Mode – Data Erratic, Intermittent, or Incorrect

ISX Codes 1000-1300

1117 Power Supply Lost With Ignition On – Data Erratic, Intermittent, or Incorrect
1239 Accelerator Pedal or Lever Position Sensor 2 Circuit – Voltage Above Normal, or Shorted to High Source
1241 Accelerator Pedal or Lever Position Sensor 2 Circuit – Voltage Below Normal, or Shorted to Low Source
1242 Accelerator Pedal or Lever Position Sensor 1 and 2 – Data Erratic, Intermittent, or Incorrect

ISX Codes 1300-1700

1663 Catalyst Inlet Temperature Sensor Swapped with Outlet – Condition Exists
1664 Catalyst Missing – Condition Exists
1665 Aftertreatment Exhaust Gas Temperature 1 Circuit – Voltage Below Normal, or Shorted to Low Source
1666 Aftertreatment Exhaust Gas Temperature 1 Circuit – Voltage Above Normal, or Shorted to High Source
1667 Aftertreatment Exhaust Gas Temperature 1 – Data Erratic, Intermittent, or Incorrect
1674 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Below Normal, or Shorted to Low Source
1675 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Above Normal, or Shorted to High Source
1676 Aftertreatment Exhaust Gas Temperature 2 – Data Erratic, Intermittent, or Incorrect
1691 Catalyst Efficiency – Out of Calibration
1695 Sensor Supply 5 – Voltage Above Normal, or Shorted to High Source
1696 Sensor Supply 5 – Voltage Below Normal, or Shorted to Low Source

ISX Codes 1700-1900

1843 Crankcase Pressure Circuit – Voltage Above Normal, or Shorted to High Source
1844 Crankcase Pressure Circuit – Voltage Below Normal, or Shorted to Low Source
1866 Exhaust Gas Recirculation Valve Delta Pressure – Data Erratic, Intermittent, or Incorrect
1876 Aftertreatment Exhaust Gas Temperature 3 Circuit – Voltage Above Normal, or Shorted to High Source
1877 Aftertreatment Exhaust Gas Temperature 3 Circuit – Voltage Below Normal, or Shorted to Low Source
1878 Aftertreatment Exhaust Gas Temperature 3 – Data Erratic, Intermittent, or Incorrect
1879 Aftertreatment Particulate Filter Differential Pressure Sensor Circuit – Voltage Above Normal, or Shorted to High Source
1881 Aftertreatment Particulate Filter Differential Pressure Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
1883 Aftertreatment Particulate Filter Differential Pressure Sensor – Data Erratic, Intermittent, or Incorrect
1893 EGR Valve Control Circuit – Abnormal Update Rate
1895 EGR Valve Controller – Bad Intelligent Device or Component
1896 EGR Valve Controller – Out of Calibration
1899 Exhaust Gas Recirculation Valve Delta Pressure – Data Valid but Above Normal Operational Range- Moderately Severe Level

ISX Codes 1900-2000

1921 Aftertreatment Particulate Filter Differential Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level
1922 Aftertreatment Particulate Filter Differential Pressure – Data Valid but Above Normal Operational Range – Most Severe Level
1923 Aftertreatment Fuel shutoff Valve 1 Circuit – Voltage Above Normal, or Shorted to High Source
1924 Aftertreatment Fuel Shutoff Valve 1 Circuit – Voltage Below Normal, or Shorted to Low Source
1925 Aftertreatment Fuel Shutoff Valve 1 – Data Erratic, Intermittent, or Incorrect
1926 Aftertreatment Fuel Pressure Sensor – Data Erratic, Intermittent, or Incorrect
1927 Aftertreatment Fuel Pressure Sensor – Voltage Above Normal, or Shorted to High Source
1928 Aftertreatment Fuel Pressure Sensor – Voltage Below Normal, or Shorted to Low Source
1932 Aftertreatment Fuel Injector 1 – Data Erratic, Intermittent, or Incorrect
1933 ECU Power Output Supply Voltage 2 – Data Valid but Above Normal Operational Range – Moderately Severe Level
1934 ECU Power Output Supply Voltage 2 – Data Valid but Below Normal Operational Range – Moderately Severe Level
1935 EGR Actuator Driver Circuit – Root Cause Not Known
1938 ECU Power Output Supply Voltage 1 – Data Valid but Below Normal Operational Range – Moderately Severe Level
1942 Crankcase Pressure – Data Erratic, Intermittent, or Incorrect
1943 Ambient Air Density – Data Valid but Below Normal Operational Range – Least Severe Level
1961 EGR Valve Control Circuit Calculated Over Temperature – Data Valid but Above Normal Operational Range – Least Severe Level
1962 VGT Actuator Driver Over Temperature (Calculated – Data Valid but Above Normal Operational Range – Least Severe Level
1963 Aftertreatment Fuel Shutoff Valve 1 – Mechanical System Not Responding Properly or Out of Adjustment
1966 Aftertreatment Exhaust Gas Temperature 1 – Data Valid but Above Normal Operational Range – Most Severe Level
1968 Aftertreatment Exhaust Gas Temperature 2 – Data Valid but Above Normal Operational Range – Moderately Severe Level
1969 Aftertreatment Exhaust Gas Temperature 2 – Data Valid but Above Normal Operational Range – Most Severe Level
1972 Aftertreatment Exhaust Gas Temperature 3 – Data Valid but Above Normal Operational Range – Moderately Severe Level
1973 Aftertreatment Exhaust Gas Temperature 3 – Data Valid but Above Normal Operational Range – Most Severe Level
1974 Crankcase Pressure – Data Valid but Above Normal Operational Range – Least Severe Level
1977 Aftertreatment Fuel Injector 1 Circuit – Current Below Normal, or Open Circuit
1981 Aftertreatment Particulate Filter Differential Pressure – Data Valid but Above Normal Operational Range – Least Severe Level
1993 Aftertreatment Particulate Filter Missing – Condition Exists

ISX Codes 2000-2200

2182 Engine Brake Actuator Driver 1 Circuit – Voltage Above Normal, or Shorted to High Source
2183 Engine Brake Actuator Driver 1 Circuit – Voltage Below Normal, or Shorted to Low Source
2185 Sensor Supply 4 Circuit — Voltage Above Normal, or Shorted to High Source
2186 Sensor Supply 4 Circuit – Voltage Below Normal, or Shorted to Low Source
2195 Auxiliary Equipment Sensor Input 3 Engine Protection Critical – Special Instructions
2198 VGT Actuator Driver Circuit – Root Cause Not Known

ISX Codes 2200-2400

2215 Fuel Pump Delivery Pressure — Data Valid but Below Normal Operational Range — Moderately Severe Level
2216 Fuel Pump Delivery Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level
2272 EGR Valve Position Circuit – Voltage Below Normal, or Shorted to Low Source
2273 Exhaust Gas Recirculation Valve Delta Pressure Sensor Circuit – Voltage Above Normal, or Shorted to High Source
2274 Exhaust Gas Recirculation Valve Delta Pressure Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
2288 Turbocharger 1 Speed – Data Valid but Above Normal Operational Range – Least Severe Level
2311 Electronic Fuel Injection Control Valve Circuit — Condition Exists
2312 Timing Actuator Driver Circuit – Condition Exists
2313 Fuel Control Valve Solenoid Driver 2 Circuit – Condition Exists
2314 Engine Timing Actuator Driver 2 Circuit Error – Condition Exists
2321 Engine Crankshaft Speed/Position — Data Erratic, Intermittent, or Incorrect
2322 Engine Camshaft Speed/Position Sensor — Data Erratic, Intermittent, or Incorrect
2345 Turbocharger 1 Speed – Abnormal Rate of Change
2346 Turbocharger Turbine Inlet Temperature (Calculated – Data Valid but Above Normal Operational Range – Least Severe Level)
2347 Turbocharger Compressor Outlet Temperature (Calculated – Data Valid but Above Normal Operational Range – Least Severe Level)
2349 EGR Valve Control Circuit – Current Below Normal, or Open Circuit
2351 EGR Valve Control Circuit – Voltage Below Normal, or Shorted to Low Source
2357 EGR Valve Control Circuit – Mechanical System Not Responding Properly or Out of Adjustment
2359 Exhaust Gas Recirculation Valve Delta Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level
2363 Engine Brake Actuator Driver Output 2 Circuit Choice
2363ism Engine Brake Actuator Driver Output 2 Circuit – Voltage Below Normal, or Shorted to Low Source
2363isx Engine Brake Actuator Driver Output 2 Circuit – Voltage Below Normal, or Shorted to Low Source
2365 Engine Brake Actuator Driver Output 3 Circuit – Voltage Below Normal, or Shorted to Low Source
2367 Engine Brake Actuator Driver Output 2 Circuit Choice
2367ism Engine Brake Actuator Driver Output 2 Circuit – Voltage Above Normal, or Shorted to High Source
2367isx Engine Brake Actuator Driver Output 2 Circuit – Voltage Above Normal, or Shorted to High Source
2368 Engine Brake Actuator Driver Output 3 Circuit – Voltage Above Normal, or Shorted to High Source
2372 Fuel Filter Differential Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level
2373 Exhaust Gas Pressure Sensor Circuit – Voltage Above Normal, or Shorted to High Source
2374 Exhaust Gas Pressure Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
2375 Exhaust Gas Recirculation Temperature Sensor Circuit – Voltage Above Normal, or Shorted to High Source
2376 Exhaust Gas Recirculation Temperature Sensor Circuit – Voltage Below Normal, or Shorted to Low Source
2377 Fan Control Circuit — Voltage Above Normal, or Shorted to High Source
2387 VGT Actuator Driver Circuit (Motor – Mechanical System Not Responding Properly, or Out of Adjustment

ISX Codes 2400-2600

2412 Fan Speed – Data Erratic, Intermittent, or Incorrect
2448 Coolant Level – Data Valid but Below Normal Operational Range – Least Severe Level
2449 VGT Actuator Controller – Out of Calibration
2451 Turbocharger Turbine Inlet Temperature (Calculated – Data Valid but Above Normal Operational Range – Moderately Severe Level
2551 Injector Metering Rail 2 Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level
2552 Injector Metering Rail 1 Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level
2554 Exhaust Gas Pressure – Data Erratic, Intermittent, or Incorrect

ISX Codes 2600-2800

2634 VGT Actuator Controller – Bad Intelligent Device or Component
2635 VGT Actuator Driver Circuit – Condition Exists
2636 VGT Actuator Driver Circuit – Abnormal Update Rate
2637 Catalyst Face Plugged – Root Cause Not Known
2638 Catalyst Efficiency – Out of Calibration
2639 Aftertreatment Particulate Filter Differential Pressure – Data Valid but Above Normal Operational Range – Least Severe Level
2646 Engine Coolant Temperature – Condition Exists
2659 Engine Coolant Temperature – Condition Exists
2728 Aftertreatment Fuel Injector 1 – Data Valid but Above Normal Operational Range – Moderately Severe Level
2732 Aftertreatment Fuel Drain Valve Circuit – Voltage Above Normal or Shorted to High Source
2733 Aftertreatment Fuel Drain Valve Circuit – Voltage Below Normal or Shorted to Low Source
2738 Start Enable Device 1 Circuit (Ether Injection – Voltage Above Normal or Shorted to High Source
2739 Start Enable Device 1 Circuit (Ether Injection – Voltage Below Normal or Shorted to Low Source
2741 Aftertreatment Fuel Shutoff Valve 1 Swapped – Condition Exists
2742 Aftertreatment Exhaust Gas Temperature 2 – Data Valid but Below Normal Operational Range – Least Severe Level
2743 Aftertreatment Exhaust Gas Temperature 2 – Data Valid but Below Normal Operational Range – Moderately Severe Level
2754 Engine Particulate Filter Inlet Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level
2764 Exhaust Gas Pressure – Data Valid but Above Normal Operational Range – Moderately Severe Level
2774 Engine Exhaust Gas Recirculation (EGR System – Condition Exists
2777 Particulate Trap Active Regeneration Inhibited Due to Inhibit Switch – Condition Exists
2789 Engine Coolant Temperature – Data Valid but Below Normal Operational Range – Moderately Severe Level

ISX Codes 2800-3000

2813 EGR Valve Control – Special Instructions
2878 Aftertreatment Fuel Drain Valve – Mechanical System Not Responding Properly or Out of Adjustment
2879 Aftertreatment Fuel Drain Valve – Data Erratic, Intermittent, or Incorrect
2881 Aftertreatment Fuel Pressure Sensor – Data Valid but Below Normal Operational Range – Least Severe Level
2961 Exhaust Gas Recirculation Temperature – Data Valid but Above Normal Operational Range – Least Severe Level
2962 Exhaust Gas Recirculation Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level
2963 Engine Coolant Temperature — Data Valid but Above Normal Operational Range — Least Severe Level
2964 Intake Manifold 1 Temperature — Data Valid but Above Normal Operational Range — Least Severe Level
2973 Intake Manifold 1 Pressure – Data Erratic, Intermittent, or Incorrect