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Engine Controls - Tests W/Codes Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Scan Tool Problems Circuit Tests Notes DTC P0100 - Mass Airflow (MAF) Sensor Circuit DTC P0101 - Mass Airflow (MAF) Sensor Circuit Range/Performance Problem 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 Problem DTC P0120 - Throttle Position (TP) Sensor Circuit Malfunction DTC P0121 - Throttle Position (TP) Sensor Circuit Range/Performance Problem DTC P0125 - Insufficient Coolant Temperature For Closed Loop Fuel Control DTC P0130, P0150 - Oxygen Sensor Related DTC P0133, O0153 - Oxygen Sensor Related DTC P0135, P0141, P0155, P0161 - Oxygen Sensor Related DTC P0136, P0156 - Oxygen Sensor Related DTC P0141 - Oxygen Sensor Related DTC P0150 - Oxygen Sensor Related DTC P0153 - Oxygen Sensor Related DTC P0155 - Oxygen Sensor Related DTC P0156 - Oxygen Sensor Related DTC P0161 - Oxygen Sensor Related DTC P0171, P0172 - Oxygen Sensor Related DTC P0300 - Random Misfire Detected DTCS P0301, P0308 - Cylinders No. 1-8 Misfire Detected DTC P0325, P0330 - Knock Sensor No. 1 & 2. DTC P0335, P1335 - Crankshaft Position (CKP) Sensor Circuit DTC P0340 - Camshaft Position (CMP) Sensor Circuit DTC P0401 - Insufficient Exhaust Gas RECIRCULATION (EGR) Flow Detected DTC P0402 - Excessive EGR Flow Detected DTC P0403 - EGR Circuit Malfunction DTC P0420, P0430 - Catalyst System Efficiency Below Threshold DTC P0440 - EVAP System Malfunction DTC P0441 - Incorrect EVAP Purge Flow DTC P0446 - Vent Control Malfunction DTC P0450 - Oxygen Sensor Related EVAP Pressure Sensor Malfunction DTC P0500 - Vehicle Speed Sensor (VSS) Malfunction DTC P0505 - Idle Control System Malfunction DTC P0510 - Closed Throttle Position (CTP) Switch Malfunction DTC P1100 - Barometric Pressure (BARO) Sensor Circuit Malfunction DTC P1200 - Fuel Pump Relay Circuit Malfunction DTC P1300, P1305 - IGNITOR Circuit Malfunction DTC P1335 - Crankshaft Position (CKP) Sensor Circuit DTC P1400 - Sub-Throttle Position (Sub-TP) Sensor Malfunction DTC P1401 - Sub-Throttle Position (Sub-TP) Sensor Circuit Range/Performance Problem DTC P1520 - Stoplight Switch Signal Malfunction DTC P1600 - ECM Batt Malfunction DTC P1605 - Knock Control ECM Malfunction DTC P1780 - Park/Neutral Position Switch Malfunction Summary