Diagnostic Trouble Code Definitions

NOTE: Diagnostic Trouble Codes (DTC) retrieved from PCM may be either engine or transmission related. Only engine-related DTCs are covered in this article. For transmission-related DTCs, see appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.

The DTCs indicate failure of a specific sensor and/or circuit. Sensor/circuit diagnosis may indicate replacement of PCM.
If PCM is replaced at any point during diagnostic testing and if condition is still not corrected after replacing PCM, the following may be the cause:
- An incorrect PCM may cause a malfunction, which may or may not set a DTC.
- The PCM connector may be the problem. Connector terminals may have to be removed from connector to be properly checked.
- Replacement PCM may be faulty.
- Intermittent problem. Make a careful physical inspection of affected sensor/circuit.
- A shorted solenoid, coil relay, or harness may be the cause of PCM failure. Use Short Circuit Tester (J-34636) to check for short circuits.

DTC IDENTIFICATION

DTC	Description	Type
P0112	IAT Sensor Circuit Low Voltage	B
P0113	IAT Sensor Circuit High Voltage	B
P0117	ECT Sensor Circuit Low Voltage	B
P0118	ECT Sensor Circuit High Voltage	B
P0121	APP Sensor 1 Circuit Performance	C
P0122	APP Sensor 1 Circuit Low Voltage	C
P0123	APP Sensor 1 Circuit High Voltage	C
P0126	Insufficient ECT For Stable Operation	B
P0182	Fuel Temperature Sensor Circuit Low Voltage	B
P0183	Fuel Temperature Sensor Circuit High Voltage	B
P0215	Engine Shutoff Solenoid Control Circuit	C*
P0216	Injection Timing Control System	B
P0219	Engine Overspeed Condition	C*
P0220	APP Sensor 2 Circuit	C
P0221	APP Sensor 2 Circuit Performance	C
P0222	APP Sensor 2 Circuit Low Voltage	C
P0223	APP Sensor 2 Circuit High Voltage	C
P0225	APP Sensor 3 Circuit	C
P0226	APP Sensor 3 Circuit Performance	C
P0227	APP Sensor 3 Circuit Low Voltage	C
P0228	APP Sensor 3 Circuit High Voltage	C
P0231	Fuel/Lift Pump Feedback Circuit Low Voltage	B
P0236	Turbocharger Boost System	B
P0237	Turbocharger Boost Sensor Circuit Low Voltage	B
P0238	Turbocharger Boost Sensor Circuit High Voltage	B
P0251	Injection Pump Cam System	A
P0263	Cylinder No. 1 Balance System	C*
P0266	Cylinder No. 2 Balance System	C*
P0269	Cylinder No. 3 Balance System	C*
P0272	Cylinder No. 4 Balance System	C*
P0275	Cylinder No. 5 Balance System	C*
P0278	Cylinder No. 6 Balance System	C*
P0281	Cylinder No. 7 Balance System	C*
P0284	Cylinder No. 8 Balance System	C*
P0300	Engine Misfire Detected	B
P0301	Cylinder No. 1 Misfire Detected	B
P0302	Cylinder No. 2 Misfire Detected	B
P0303	Cylinder No. 3 Misfire Detected	B
P0304	Cylinder No. 4 Misfire Detected	B
P0305	Cylinder No. 5 Misfire Detected	B
P0306	Cylinder No. 6 Misfire Detected	B
P0307	Cylinder No. 7 Misfire Detected	B
P0308	Cylinder No. 8 Misfire Detected	B
P0335	CKP Sensor Circuit Performance	A
P0370	Timing Reference High Resolution	A
P0380	Glow Plug Circuit Performance	B
P0501	Vehicle Speed Sensor Circuit	C*
P0567	Cruise Resume Circuit	C*
P0568	Cruise Set Circuit	C*
P0571	Cruise Brake Switch Circuit	C*
P0601	PCM Memory	A
P0602	PCM Not Programmed	C*
P0604	Control Module Random Access Memory	C*
P0606	PCM Internal Communication Interrupted	A
P1125	APP System	C
P1214	Injection Pump Timing Offset Error	B
P1216	Fuel Solenoid Response Time Too Short	C
P1217	Fuel Solenoid Response Time Too Long	C
P1218	Injection Pump Calibration Circuit	B
P1621	EEPROM Write	C*
P1626	VTD Controller Serial Data Circuit	C*
P1627	A/D Performance	B
P1630	Theft Deterrent PCM In Learn Mode	B
P1631	Theft Deterrent Password Incorrect	C*
P1635	PCM 5-Volt Reference Low	C
P1641	MIL Control Circuit	C*
P1643	WAIT TO START Light Control Circuit	B
P1654	SERVICE THROTTLE SOON Light Control Circuit	C*
P1656	Wastegate Solenoid Control Circuit	B