Navistar Diagnostic Trouble Codes List

Service technicians have no problem recognising breakdowns and carrying out machine diagnostics, Navistar Diagnostic Trouble Codes List, plus they are familiar with equipment from a variety of manufacturers.

Navistar International Corporation is an American holding company created in 1986 as the successor to International Harvester. Navistar operates as the owner of International brand of trucks and diesel engines. The company also produces buses under the IC Bus brand. On July 1, 2021, Navistar became a wholly owned subsidiary of Traton, and therefore part of the Volkswagen Group.

Navistar DTC Codes List

DTC	Circuit	Condition Description
111	ECM	No errors detected – flash code only
112	ECM PWR	Electrical system voltage B+ out-of-range high
113	ECM PWR	Electrical system voltage B+ out-of-range low
114	ECT	Engine Coolant Temperature signal out-of-range low
115	ECT	Engine Coolant Temperature signal out-of-range high
121	MAP	Intake Manifold Absolute Pressure signal out-of-range high
122	MAP	Intake Manifold Absolute Pressure signal out-of-range low
123	MAP	Intake Manifold Absolute Pressure signal in-range fault
124	ICP	Injection Control Pressure signal out-of-range low
125	ICP	Injection Control Pressure signal out-of-range high
126	BCP	Engine Brake Control Pressure signal out-of-range low
127	BCP	Engine Brake Control Pressure signal out-of-range high
131	APS/IVS	APS signal out-of-range low
132	APS/IVS	APS signal out-of-range high
133	APS/IVS	APS signal in-range DTC
134	APS/IVS	APS signal and IVS disagree
135	APS/IVS	Idle Validation Switch circuit fault
136	EFP	Engine Fuel Pressure signal out-of-range low
137	EFP	Engine Fuel Pressure signal out-of-range high
141	VVS	Vehicle Speed Sensor signal out-of-range low
142	VVS	Vehicle Speed Sensor signal out-of-range high
143	CMP	Incorrect CMP signal signature
145	CMP	CMP signal inactive
146	CKP	CKP signal inactive
147	CKP	Incorrect CKP signal signature
151	BAP	Barometric Absolute Pressure signal out-of-range high
152	BAP	Barometric Absolute Pressure signal out-of-range low
153	WIF	Barometric Absolute Pressure signal out-of-range low
154	IAT	Inlet Air temperature signal out-of-range low
155	IAT	Inlet Air temperature signal out-of-range high
161	MAT	Manifold Air Temperature Signal out-of-range low
162	MAT	Manifold Air Temperature Signal out-of-range high
163	EGR	Exhaust Gas Recirculation Valve Position Signal out-of-range low
211	EOP	Engine Oil Pressure signal out-of-range low
212	EOP	Engine Oil Pressure signal out-of-range high
215	VSS	Vehicle Speed Sensor signal frequency out-of-range high
225	EOP	EOP sensor signal in-range fault
231	ATA	ATA data communication link error
236	ELC	ECL switch circuit fault
241	IPR	Injection Control Pressure regulator OCC self test failed
246	EFAN	Engine Fan – OCC self test fault
247	BSV	Engine Brake enable OCC self test failed
251	IAH	Inlet Air Heater OCC self test failed
256	RSE	Variable Geometry Turbo control OCC self test failed
267	ECI	Engine Crank Inhibit OCC self test failed
311	EOT	Engine Oil Temperature signal out-of-range low
312	EOT	Engine Oil Temperature signal out-of-range high
313	EWPS	Engine Oil Pressure below warning level
314	EWPS	Engine Oil Pressure below critical level
315	EWPS	Engine speed above warning level
316	EWPS	Engine Coolant Temperature unable to reach commanded set point
321	EWPS	Engine Coolant Temperature above warning level
322	EWPS	Engine Coolant Temperature above critical level
323	EWPS	Engine Coolant Level below warning/critical level
324	IST	Idle Shutdown Timer enabled engine shutdown
325	EWPS	Power reduced, matched to cooling system performance
331	ICP SYS	Injection Control Pressure above system working range
332	ICP	Injection Control Pressure above spec. with engine not running
333	ICP SYS	Injection Control Pressure above/below desired level
334	ICP SYS	ICP unable to achieve setpoint in time (poor performance)
335	ICP SYS	ICP unable to build pressure during cranking
341	EBP	Exhaust Back Pressure signal out-of-range low
342	EBP	Exhaust Back Pressure signal out-of-range high
343	AMS	Excessive exhaust back pressure (gauge)
344	EBP	Exhaust back pressure above spec. when engine off
345	AMS	Faults detected during VGT portion of the AMS Test
346	AMS	Faults detected during EGR portion of the AMS Test
351	AMS	Change in exhaust back pressure did not occur when expected
353	AMS	Variable Geometry Turbo control over duty cycle
354	AMS	Variable Geometry Turbo control under duty cycle
355	AMS	Variable Geometry Turbo overspeed
361	AMS	VGT control input (MAP/EBP) above/below desired level
365	AMS	EGR Valve Position above/below desired level
368	AMS	EGR driver module/ECM2 communication fault
371	EFP	Engine Fuel Pressure is above normal operating range
372	EFP	Engine Fuel Pressure is below normal operating range
421 – 426	INJ	High side to low side open (cylinder number indicated)
431 – 436	INJ	High side shorted to low side (cylinder number indicated)
451 – 456	INJ	High side short to ground or V BAT (cylinder number indicated)
523	IDM	IDM V IGN voltage low
525	IDM	IDM fault
533	IDM	IDM relay voltage high
534	IDM	IDM relay voltage low
543	ECM/IDM	ECM/IDM communications fault
546	ECM/IDM	Engine Brake Control Pressure is below expected range
547	ECM/IDM	Engine Brake Control Pressure is above expected range
551	ECM/IDM	IDM/CMPO signal inactive
552	ECM/IDM	IDM incorrect CMPO signal signature
553	ECM/IDM	IDM CKPO signal inactive
554	ECM/IDM	IDM incorrect CKPO signal signature
613	ECM	ECM/IDM software not compatible
614	ECM	EFRC/ECM configuration mismatch
621	ECM	Engine using mfg. default rating
622	ECM	Engine using field default rating
623	ECM	Invalid Engine Family Rating Code (EFRC)
624	ECM	Field default active
626	ECM/PWR	Unexpected reset fault
631	ECM	Read Only Memory (ROM) self test fault
632	ECM	Random Access Memory (RAM) – CPU self test fault
655	ECM	Programmable parameter list level incompatible
661	ECM	RAM programmable parameter list corrupt
664	ECM	Calibration level incompatible
665	ECM	Programmable parameter memory content corrupt

The diagnosis tool Navistar Diagnostic Trouble Codes List for trucks provides different possibilities such as information on the use and location of the connectors, detection and description of errors, activation of the fan, compression test and other components, system data information and more.