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Engine Controls - Self-Diagnostics Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Test Equipment Summary Diagnostic Trouble Code Definitions Diagnostic Tests Notes DTC P0010: Variable Valve Timing System, Camshaft Position Actuator Circuit DTC P0011: Variable Valve Timing System, Camshaft Position Timing Over-Advanced DTC P0012: Variable Valve Timing System, Camshaft Position Timing Over-Retarded DTC P0031: Front Ho2S Heater Circuit Low DTC P0032: Front Ho2S Heater Circuit High DTC P0037: Rear Ho2S Heater Circuit Low DTC P0038: Rear Ho2S Heater Circuit High DTC P0102: Mass Airflow (MAF) Sensor Circuit, Low Input DTC P0103: Mass Airflow (MAF) Sensor Circuit, High Input DTC P0106: BARO Circuit, Performance Problem DTC P0107: BARO Circuit, Low Input DTC P0108: BARO Circuit, High Input DTC P0111: Intake Air Temperature (IAT) Sensor Circuit, Performance Problem DTC P0112: Intake Air Temperature (IAT) Sensor Circuit, Low Input DTC P0113: Intake Air Temperature (IAT) Sensor Circuit, High Input DTC P0116: Engine Coolant Temperature (ECT) Sensor Circuit, Range/Performance Problem DTC P0117: Engine Coolant Temperature (ECT) Sensor Circuit, Low Input DTC P0118: Engine Coolant Temperature (ECT) Sensor Circuit, High Input DTC P0122: Throttle Position (TP) Sensor Circuit, Low Input DTC P0123: Throttle Position (TP) Sensor Circuit, High Input DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control DTC P0126: Insufficient Coolant Temperature For Stable Operation DTC P0128: Coolant Temperature Less Than Thermostat REGUALTING Temperature DTC P0130: Front Ho2S Circuit Malfunction DTC P0134: Front Ho2S Circuit, No Activity Detected DTC P0138: Rear Ho2S Circuit, High Input DTC P0140: Rear Ho2S Circuit, No Activity Detected DTC P0171: Fuel Trim Too Lean DTC P0172: Fuel Trim Too Rich DTC P0300: Random Misfire Detected DTC P0300, P0301, P0302, P0303 Or P0304: Misfire Detection Monitor DTC P0327: Knock Sensor (KS) Circuit, Low Input DTC P0328: Knock Sensor (KS) Circuit, High Input DTC P0335: Crankshaft Position (CKP) Sensor Circuit Malfunction DTC P0340: Camshaft Position (CMP) Sensor Circuit Malfunction DTC P0401: EGR System, Insufficient Flow DTC P0402: EGR System, Excessive Flow DTC P0420: Catalyst System Efficiency Below Threshold DTC P0442: EVAP Control System, Small Leak Detected DTC P0443: EVAP Control System Purge Control Valve, Circuit Malfunction DTC P0451: Fuel Tank Pressure Sensor, Performance Problem DTC P0452: EVAP Control System Pressure Sensor, Low Input DTC P0453: EVAP Control System Pressure Sensor, High Input DTC P0455: EVAP Control System Malfunction, Excessive Leak Detected DTC P0461: Fuel Gauge Sending Unit Circuit, Range/Performance Problem DTC P0462: Fuel Gauge Sending Unit Circuit, Low Input DTC P0463: Fuel Gauge Sending Unit Circuit, High Input DTC P0464: Fuel Gauge Sending Unit Circuit, Slosh Check DTC P0480: Cooling Fan Relay Circuit DTC P0500: Vehicle Speed Sensor Malfunction DTC P0506: Idle Control System, Rpm Less Than Expected DTC P0507: Idle Control System, Rpm Greater Than Expected DTC P0550: Power Steering Pressure Switch Circuit Malfunction DTC P0605: Internal Control Module Read Only Memory (ROM) Error DTC P0703: Brake Switch Input Circuit Malfunction DTC P0704: Clutch Switch Input Circuit Malfunction DTC P0705: Neutral Switch Input Circuit Malfunction DTC P1102: Mass Airflow (MAF) Sensor Inconsistent With Throttle Position Sensor, Less Than Expected DTC P1103: Mass Airflow (MAF) Sensor Inconsistent With Rpm, Greater Than Expected DTC P1122: Throttle Position Stuck Closed, Low Input DTC P1123: Throttle Position Stuck Open, High Input DTC P1170: Front Ho2S, No Inversion DTC P1345: Camshaft Position (CMP) Sensor Circuit Malfunction DTC P1449: Canister Drain Cut Valve (CDCV), Open Or Short DTC P1450: EVAP Control System Malfunction, Excessive Vacuum DTC P1487: EGR Boost Sensor Solenoid Valve Circuit Malfunction DTC P1496: EGR Valve Solenoid Coil No. 1, Open Or Short DTC P1497: EGR Valve Solenoid Coil No. 2, Open Or Short DTC P1498: EGR Valve Solenoid Coil No. 3, Open Or Short DTC P1499: EGR Valve Solenoid Coil No. 4, Open Or Short DTC P1504: Idle Air Control (IAC) Valve Circuit Malfunction DTC P1512: Variable Tumble Control System (VTCS), Stuck Closed DTC P1518: Variable Tumble Control System (VTCS), Stuck Open DTC P1562: Pcm +BB Voltage Low DTC P1569: Variable Tumble Control System (VTCS) Solenoid Valve Circuit, Low Input DTC P1570: Variable Tumble Control System (VTCS) Solenoid Valve Circuit, High Input DTC P1601: Pcm-TCM Communication Line Error DTC P1602: Immobilizer Unit-Pcm Communication Line Error DTC P1603: Key Id Number Unregistered In Pcm DTC P1604: Code Word Unregistered In Pcm DTC P1608: Pcm Internal Circuit Malfunction DTC P1621: Code Word Mismatch After Engine Cranking DTC P1622: Key Id Number Mismatch DTC P1623: Code Word Or Key Id Number Read/Write Error In Pcm DTC P1624: Immobilizer System Communication Counter = Zero DTC P1631: Generator Output Voltage Signal, No Electricity DTC P1633: Battery Overcharge DTC P1634: Generator Terminal "B" Circuit Open Reference Voltage Test