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Engine Controls - Self-Diagnostics Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Scan Tool Problems Summary Diagnostic Tests Notes DTC P0100: Mass Airflow (MAF) Sensor Circuit DTC P0101: Mass Airflow (MAF) Sensor Circuit Range/Performance Fault DTC P0110: Intake Air Temperature (IAT) Sensor Circuit DTC P0115: Engine Coolant Temperature (ECT) Sensor Circuit DTC P0116: Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance Fault DTC P0120: Throttle Position (TP) Sensor Circuit Malfunction DTC P0121: Throttle Position (TP) Sensor "A" Circuit Range/Performance Fault DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control DTC P0128: Thermostat Fault DTC P0130 Or DTC P0150: Heated Oxygen Sensor Circuit Malfunction DTC P0133 Or DTC P0153: Heated Oxygen Sensor Circuit Slow Response DTC P0135, DTC P0155, DTC P0141 Or DTC P0161 DTC P0136 Or DTC P0156: Heated Oxygen Sensor Circuit Malfunction DTC P0171, DTC P0172, DTC P0174 Or DTC P0175 DTC P0300: Random Cylinder Misfire Detected DTC P0301, DTC P0302, DTC P0303, DTC P0304, DTC P0305, DTC P0306, DTC P0307 Or DTC P0308, DTC P0325 Or P0330: Knock Sensor Circuit Malfunction DTC P0335 Or P1335: Crankshaft Position (CKP) Sensor DTC P0340: Camshaft Position (CMP) Sensor Circuit DTC P0420 Or P0430: Catalyst System Efficiency Below Threshold DTC P0440 Or DTC P0442 DTC P0441 Or DTC P0446 DTC P0450 Or DTC P0451 DTC P0500: Vehicle Speed Sensor (VSS) Malfunction DTC P0505: Idle Control System Malfunction DTC P1120: Accelerator Pedal Position Sensor Circuit Malfunction DTC P1121: Accelerator Pedal Position Sensor Circuit Malfunction DTC P1125: Throttle Control Motor Circuit Malfunction DTC P1127: Electronic Throttle Control System (ETCS) Actuator Power Source Circuit Malfunction DTC P1128: Throttle Control Motor Lock Malfunction DTC P1129: Electronic Throttle Control System (ETCS) Malfunction DTC P1300, DTC P1305, DTC P1310, DTC P1315, DTC P1320, DTC P1325, DTC P1330 Or DTC P1340 DTC P1335: Crankshaft Position (CKP) Sensor Malfunction (While Running) DTC P1345 Or P1350: Variable Valve Timing (VVT) Sensor Circuit Malfunction DTC P1346 Or P1351: Variable Valve Timing (VVT) DTC P1349 Or P1354: Variable Valve Timing (VVT) DTC P1520: Stoplight Switch Signal Malfunction DTC P1600: ECM Batt Malfunction DTC P1633: Electronic Throttle Control System (ETCS) Circuit ECM Malfunction DTC P1645: Body Ecu Malfunction DTC P1656 Or P1663: Oil Control Valve (OCV) DTC P1780: Park/Neutral Position Switch Malfunction