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Engine Control System Self-Diagnostics Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Programming Scan Tool Problems Summary Diagnostic Trouble Code Definitions Diagnostic Tests Notes DTC P0100: Mass Airflow Meter Circuit DTC P0101: Mass Airflow Meter Circuit Range/Performance DTC P0110: Intake Air Temperature Sensor Circuit DTC P0115: Engine Coolant Temperature Sensor Circuit DTC P0116: Engine Coolant Temperature Sensor Circuit Range/Performance DTC P0120: Throttle Position Sensor Circuit DTC P0121: Throttle Position Sensor Circuit Range/Performance DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control DTC P0128: Thermostat Malfunction DTC P0136: Heated Oxygen Sensor Circuit DTC P0141: Heated Oxygen Sensor Heater Circuit DTC P0171: System Too Lean, Or DTC P0172: System Too Rich DTC P0300: Random/Multiple Cylinder Misfire Detected DTC P0301: Cylinder No. 1 Misfire Detected, DTC P0302: Cylinder No. 2 Misfire Detected, DTC P0303: Cylinder No. 3 Misfire Detected, DTC P0304: Cylinder No. 4 Misfire Detected, DTC P0305: Cylinder No. 5 Misfire Detected, DTC P0306: Cylinder No. 6 Misfire Detected, DTC P0325: Knock Sensor No. 1 Circuit DTC P0330: Knock Sensor No. 2 Circuit DTC P0335 Or P1335: Crankshaft Position Sensor Circuit DTC P0340: Camshaft Position Sensor Circuit DTC P0420: Catalyst System Efficiency Below Threshold DTC P0440: Evaporative Emission Control System, Or DTC P0442: EVAP Leak Detected DTC P0441: Incorrect EVAP Purge Flow, Or DTC P0446: EVAP Vent Control Malfunction DTC P0442: EVAP Leak Detected DTC P0446: EVAP Vent Control Malfunction DTC P0450: EVAP Pressure Sensor Circuit, Or DTC P0451: EVAP Pressure Sensor Range/Performance DTC P0500: Vehicle Speed Sensor Circuit DTC P0505: Idle Control System Malfunction DTC P1120: Accelerator Pedal Position Sensor Circuit DTC P1121: Accelerator Pedal Position Sensor Range/Performance DTC P1125: Throttle Control Motor Circuit DTC P1126: Magnetic Clutch Circuit DTC P1127: Electronic Throttle Control System Actuator Power Source Circuit DTC P1128: Throttle Control Motor Lock Malfunction DTC P1129: Electronic Throttle Control System Malfunction DTC P1130: Air/Fuel Sensor Circuit Range/Performance DTC P1133: Air/Fuel Sensor Circuit Response Malfunction DTC P1135: Air/Fuel Sensor Heater Circuit Malfunction DTC P1300: IGNITOR Circuit DTC P1335: Crankshaft Position Sensor Circuit DTC P1520: Stoplight Switch Signal Circuit DTC P1600: Engine Control Module Batt Circuit DTC P1633: ECM Malfunction (Electronic Throttle Control System Circuit) DTC P1780: Park/Neutral Position Switch Circuit