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Engine Controls - Self-Diagnostics Expand All (for easy ctrl-f) Collapse All Introduction General Description Self-Diagnostic System Engine Control Module Programming Monitors Summary Diagnostic Trouble Code Definitions Component Locations ECM Connector Identification System Tests Diagnostic Tests Notes DTCS P0031 Or P0032: Ho2S Bank 1, Sensor 1 - Heater Circuit Low/High DTCS P0037 Or P0038: Ho2S Bank 1, Sensor 2 Heater Circuit Low/High DTCS P0051 Or P0052: Ho2S Bank 2, Sensor 1 Heater Circuit Low/High DTCS P0057 Or P0058: Ho2S Bank 2, Sensor 2 Heater Circuit Low/High DTC P0101: Mass Air Flow Sensor - Performance Problem DTC P0102: Mass Air Flow Sensor Circuit - Low Voltage DTC P0103: Mass Air Flow Sensor Circuit - High Voltage DTCS P0107 Or P0108: Map Sensor CIRCIUT - Low Input/High Input DTC P0111: Intake Air Temperature Sensor Circuit - Range/Performance Problem DTC P0112: Intake Air Temperature Sensor Circuit - Low Input DTC P0113: Intake Air Temperature Sensor Circuit - High Input DTC P0116: Engine Coolant Temperature Sensor Circuit - Range/Performance Problem DTC P0117: Engine Coolant Temperature Sensor Circuit - Low Input DTC P0118: Engine Coolant Temperature Sensor Circuit - High Input DTC P0121: Throttle Position Sensor Circuit - Range/Performance Problem DTC P0122: Throttle Position Sensor Circuit - Low Input DTC P0123: Throttle Position Sensor Circuit - High Input DTC P0125: Insufficient Coolant Temperature For Closed Loop Operation DTC P0128: Coolant Thermostat Malfunction DTCS P0131 Or P0132: Ho2S Bank 1, Sensor 1 Circuit Low Voltage/High Voltage DTC P0133: Bank 1 Ho2S No. 1 Circuit - Slow Response Time DTC P0134: Bank 1 Ho2S No. 1 Circuit - No Activity Detected DTC P0137: Bank 1 Ho2S No. 2 - Low Voltage DTC P0138 Or P0140: Ho2S Bank 1, Sensor 2 - High Circuit Voltage Or No Activity DTCS P0151 Or P0152: Ho2S Bank 2, Sensor 1 - Low Voltage/High Voltage DTC P0153: Bank 2 Ho2S No. 1 Circuit - Slow Response - 2.5L DTC P0153: Bank 2 Ho2S No. 1 Circuit - Slow Response - 2.7L DTC P0154: Bank 2 Ho2S No. 1 Circuit - No Activity Detected DTC P0157: Bank 2 Ho2S No. 2 - Low Voltage DTCS P0158 Or P0160: Ho2S Bank 2, Sensor 2 - High Circuit Voltage Or No Activity DTCS P0171 Or P0172: Bank 1 Fuel System - Too Lean/Too Rich DTCS P0174 Or P0175: Bank 2 Fuel System - Too Lean/Too Rich DTCS P0300, P0301, P0302, P0303, P0304, P0305 Or P0306: Misfire Detected DTCS P0327 Or P0328: Knock Sensor Circuit - Low/High DTC P0335: Crankshaft Position Sensor - Circuit Malfunction DTC P0340: Camshaft Position Sensor - Circuit Malfunction DTC P0401 Or P0402: EGR Flow - Insufficient/Excessive DTC P0403: EGR Flow Circuit Malfunction DTC P0420: Bank 1 Catalyst System - Low Efficiency DTC P0430: Bank 2 Catalyst System - Low Efficiency DTC P0441: EVAP Control System - Incorrect Purge Flow DTCS P0442 Or P0455: EVAP System Leak - Small Leak/Gross Leak DTC P0443: EVAP Control System - Purge Control Valve Circuit Malfunction DTC P0446: EVAP Control System - Vent Valve Control Circuit Malfunction DTC P0449: EVAP Control System Vent Valve - Solenoid Circuit Malfunction DTC P0451: EVAP System Pressure Sensor - Range/Performance DTCS P0452 Or P0453: EVAP System Pressure Sensor - Low/High DTC P0456: EVAP System Leak - Very Small Leak DTC P0461: Fuel Level Sensor Circuit - Performance Problem DTC P0463: Fuel Level Sensor Circuit - High Input DTC P0464: Fuel Level Sensor Circuit - Intermittent Problem DTC P0496: EVAP System - Flow During Non-Purge DTC P0500: Vehicle Speed Sensor Malfunction DTCS P0506 Or P0507: Idle Air Control System - Rpm Too Low/Rpm Too High DTC P0601: Internal Control Module Memory Check Sum Error DTC P0616: Starter Signal Circuit - Low DTC P0617: Starter Signal Circuit - High DTC P1510: Engine Control Module Back-Up Power Supply Malfunction DTC P2025: EVAP Fuel Vapor Temperature Sensor - Performance DTC P2026: EVAP Fuel Vapor Temperature Sensor - Low Voltage DTC P2027: EVAP Fuel Vapor Temperature Sensor - High Voltage DTCS P2227, P2228 Or P2229: Barometric Pressure Circuit - Performance/Low/High