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Engine Controls - Self-Diagnostics Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Summary DTC Definition System Tests Diagnostic Tests DTC P0101: Mass Air Flow (MAF) Sensor Circuit Performance Problem DTC P0102: Mass Air Flow (MAF) Sensor Circuit, Low Input DTC P0103: Mass Air Flow (MAF) Sensor Circuit, High Input DTC P0111: Intake Air Temperature (IAT) Sensor Circuit Range/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 P0121: Throttle Position (TP) Sensor Circuit Performance Problem 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 Operation DTC P0131: Ho2S No. 1 Circuit, Low Input, Or DTC P0132: Ho2S No. 1 Circuit, High Input DTC P0133: Ho2S No. 1 Circuit, Slow Response DTC P0134: Ho2S No. 1 Circuit, No Activity Detected DTC P0135: Ho2S No. 1 Heater Circuit Malfunction DTC P0136: Ho2S No. 2 Circuit Malfunction DTC P0141: Ho2S No. 2 Heater Circuit Malfunction DTC P0171: Total Fuel Trim Is Greater Than Allowed Specification, Or DTC P0172: Total Fuel Trim Is Less Than Allowed Specification DTC P0300: Random Misfire, Or DTC P0301, P0302, P0303 Or P0304: Cylinders No. 1-4 Misfire DTC P0327: Knock Sensor Circuit, Low Input, Or DTC P0328: Knock Sensor Circuit, High Input DTC P0335: Crankshaft Position (CKP) Sensor Circuit Malfunction DTC P0340: Camshaft Position (CMP) Sensor Circuit Malfunction DTC P0400: EGR Flow Malfunction DTC P0403: EGR Flow Malfunction DTC P0420: Catalyst System Low Efficiency DTC P0440: EVAP Circuit, Malfunction, Or DTC P0455: EVAP Circuit, Large Leak Detected DTC P0443: EVAP Circuit, Purge Control Valve Circuit Malfunction DTC P0450: EVAP Circuit, Pressure Sensor Malfunction DTC P0451: EVAP Circuit, Pressure Sensor Range/Performance Problem DTC P0461: Fuel Level Sensor Circuit Performance Problem DTC P0463: Fuel Level Sensor Circuit, High Input DTC P0500: Vehicle Speed Sensor (VSS) Malfunction DTC P0505: Idle Air Control (IAC) System Malfunction DTC P0601: Internal Control Module Memory Check Sum Error DTC P1408: Manifold Absolute Pressure (Map) Sensor Circuit Malfunction DTC P1410: Fuel Tank Pressure Circuit Malfunction DTC P1450: Barometric Pressure Sensor Circuit Malfunction, Or DTC P1451: Barometric Pressure Sensor Performance Problem DTC P1500: Starter Signal Circuit Malfunction DTC P1510: Pcm Back-Up Power Supply Malfunction