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Engine Controls - Self-Diagnostics Expand All (for easy ctrl-f) Collapse All Model Identification Introduction Self-Diagnostic System Programming Inspection/Maintenance Procedures Summary Diagnostic Trouble Code Definition System Tests Diagnostic Tests Notes DTC P0030: Ho2S Heater Circuit - Bank 1, Sensor 1 DTC P0031: Ho2S Heater Circuit - Low Voltage - Bank 1, Sensor 1 DTC P0032: Ho2S Heater Circuit - High Voltage - Bank 1, Sensor 1 DTC P0036: Ho2S Heater Circuit - Bank 1, Sensor 2 DTC P0037: Ho2S Heater Circuit - Low Voltage - Bank 1, Sensor 2 DTC P0038: Ho2S Heater Circuit - High Voltage - Bank 1, Sensor 2 DTC P0050: Ho2S Heater Circuit - Bank 2, Sensor 1 DTC P0051: Ho2S Heater Circuit - Low Voltage - Bank 2, Sensor 1 DTC P0052: Ho2S Heater Circuit - High Voltage - Bank 2, Sensor 1 DTC P0056: Ho2S Heater Circuit - Bank 2, Sensor 2 DTC P0057: Ho2S Heater Circuit - Low Voltage - Bank 2, Sensor 2 DTC P0058: Ho2S Heater Circuit - High Voltage - Bank 2, Sensor 2 DTC P0101: MAF System Performance DTC P0102: MAF Sensor Circuit - Low Signal/Frequency DTC P0103: MAF Sensor Circuit - High Signal/Frequency DTC P0107: Map Sensor Circuit - Low Voltage DTC P0108: Map Sensor Circuit - High Voltage DTC P0112: IAT Sensor Circuit - Low Voltage/High Temperature DTC P0115: ECT Sensor Circuit DTC P0116: ECT Sensor Circuit Performance DTC P0117: ECT Sensor Circuit - Low Voltage/High Temperature DTC P0118: ECT Sensor Circuit - High Voltage/Low Temperature DTC P0121: TP Sensor No. 1 Circuit Performance DTC P0122: TP Sensor No. 1 Circuit - Low Voltage DTC P0123: TP Sensor No. 1 Circuit - High Voltage DTC P0130: Ho2S Circuit - Bank 1, Sensor 1 DTC P0131: Ho2S Circuit - Low Voltage - Bank 1, Sensor 1 DTC P0132: Ho2S Circuit - High Voltage - Bank 1, Sensor 1 DTC P0134: Ho2S Circuit - Insufficient Activity - Bank 1, Sensor 1 DTC P0135: Ho2S Heater Circuit Performance - Bank 1, Sensor 1 DTC P0136: Ho2S Circuit - Bank 1, Sensor 2 DTC P0138: Ho2S Circuit - High Voltage - Bank 1, Sensor 2 DTC P0139: Ho2S Circuit - Slow Response - Bank 1, Sensor 2 DTC P0140: Ho2S Circuit - Insufficient Activity - Bank 1, Sensor 2 DTC P0141: Ho2S Heater Circuit Performance - Bank 1, Sensor 2 DTC P0150: Ho2S Circuit - Bank 2, Sensor 1 DTC P0151: Ho2S Circuit - Low Voltage - Bank 2, Sensor 1 DTC P0152: Ho2S Circuit - High Voltage - Bank 2, Sensor 1 DTC P0154: Ho2S Circuit - Insufficient Activity - Bank 2, Sensor 1 DTC P0155: Ho2S Heater Circuit Performance - Bank 2, Sensor 1 DTC P0156: Ho2S Circuit - Bank 2, Sensor 2 DTC P0158: Ho2S Circuit - High Voltage - Bank 2, Sensor 2 DTC P0159: Ho2S Circuit - Slow Response - Bank 2, Sensor 2 DTC P0160: Ho2S Circuit - Insufficient Activity - Bank 2, Sensor 2 DTC P0161: Ho2S Heater Circuit Performance - Bank 2, Sensor 2 DTC P0171: Fuel Trim System Lean - Bank 1 DTC P0172: Fuel Trim System Rich - Bank 1 DTC P0174: Fuel Trim System Lean - Bank 2 DTC P0175: Fuel Trim System Rich - Bank 2 DTC P0201: Injector No. 1 Control Circuit DTC P0202: Injector No. 2 Control Circuit DTC P0203: Injector No. 3 Control Circuit DTC P0204: Injector No. 4 Control Circuit DTC P0205: Injector No. 5 Control Circuit DTC P0206: Injector No. 6 Control Circuit DTC P0221: TP Sensor No. 2 Circuit Performance DTC P0222: TP Sensor No. 2 Circuit - Low Voltage DTC P0223: TP Sensor No. 2 Circuit - High Voltage DTC P0230: Fuel Pump Relay Control Circuit DTC P0231: Fuel Pump Relay Control Circuit - Low Voltage DTC P0232: Fuel Pump Relay Control Circuit - High Voltage DTC P0261: Injector No. 1 Control Circuit - Low Voltage DTC P0262: Injector No. 1 Control Circuit - High Voltage DTC P0264: Injector No. 2 Control Circuit - Low Voltage DTC P0265: Injector No. 2 Control Circuit - High Voltage DTC P0267: Injector No. 3 Control Circuit - Low Voltage DTC P0268: Injector No. 3 Control Circuit - High Voltage DTC P0270: Injector No. 4 Control Circuit - Low Voltage DTC P0271: Injector No. 4 Control Circuit - High Voltage DTC P0273: Injector No. 5 Control Circuit - Low Voltage DTC P0274: Injector No. 5 Control Circuit - High Voltage DTC P0276: Injector No. 6 Control Circuit - Low Voltage DTC P0277: Injector No. 6 Control Circuit - High Voltage DTC P0300: Engine Misfire Detected DTC P0301-P0306: Specific Cylinder Misfire Detected DTC P0313: Misfire Detected With Low Fuel DTC P0324: Knock Sensor Module Circuit DTC P0327: Knock Sensor No. 1 Circuit - Low Input DTC P0328: Knock Sensor No. 1 Circuit - High Input DTC P0332: Knock Sensor No. 2 Circuit - Low Input DTC P0333: Knock Sensor No. 2 Circuit - High Input DTC P0335: Crankshaft Position Sensor Circuit DTC P0341: Camshaft Position Sensor Circuit Performance DTC P0342: Camshaft Position Sensor Circuit - Low Voltage DTC P0343: Camshaft Position Sensor Circuit - High Voltage DTC P0401: EGR Flow Insufficient DTC P0402: EGR Flow Excessive DTC P0403: EGR Solenoid Control Circuit DTC P0405: EGR Position Sensor CIRCIUT - Low Voltage DTC P0406: EGR Position Sensor Circuit - High Voltage DTC P0421 & P0422: Warm-Up Catalyst - Low Efficiency - Bank 1 DTC P0431 & P0432: Warm-Up Catalyst - Low Efficiency - Bank 2 DTC P0440: Evaporative Emission System DTC P0442: EVAP System - Small Leak Detected DTC P0443: EVAP Purge Solenoid Control Circuit - Low Voltage DTC P0444: EVAP Purge Solenoid Control Circuit DTC P0445: EVAP Purge Solenoid Control - High Voltage DTC P0447: EVAP Vent Solenoid Control Circuit DTC P0448: EVAP Vent Solenoid Control Circuit - High Voltage DTC P0449: EVAP Vent Solenoid Control Circuit - Low Voltage DTC P0451: EVAP Fuel Tank Pressure Sensor Circuit Performance DTC P0452: EVAP Fuel Tank Pressure Sensor Circuit - Low Voltage DTC P0453: EVAP Fuel Tank Pressure Sensor Circuit - High Voltage DTC P0455: EVAP System Gross Leak Detected DTC P0461: Fuel Level Sensor Circuit Performance DTC P0462: Fuel Level Sensor Circuit - Low Voltage DTC P0463: Fuel Level Sensor Circuit - High Voltage DTC P0480: Cooling Fan Control Relay Circuit No. 1 DTC P0481: Cooling Fan Control Relay No. 2 Circuit DTC P0500: OSS Circuit Low Input (With Abs) DTC P0500: OSS Circuit Low Input (Without Abs) DTC P0506: Idle Speed Low DTC P0507: Idle Speed High DTC P0532: A/C Refrigerant Pressure Sensor Circuit - Low Voltage DTC P0533: A/C Refrigerant Pressure Sensor Circuit - High Voltage DTC P0560: System Voltage DTC P0562: System Voltage Low DTC P0563: System Voltage High DTC P0571: Cruise/Brake Switch Circuit DTC P0601: ECM Memory DTC P0602: ECM Not Programmed DTC P0603: ECM Memory Reset DTC P0604: ECM Ram DTC P0606: ECM Internal Performance DTC P0621: Generator "L" Terminal Circuit DTC P0645: A/C Clutch Relay Circuit Open DTC P0646: A/C Clutch Relay Circuit - Low Voltage DTC P0647: A/C Clutch Relay Circuit - High Voltage DTC P0705: Transmission Range Switch Circuit DTC P0719: Brake Switch Circuit Low Voltage DTC P0724: Brake Switch Circuit High Voltage DTC P1245: Intake Plenum Switchover Valve DTC P1271: App Sensors No. 1 & 2 Circuit Performance DTC P1277: App Sensor No. 1 Circuit - Low Voltage DTC P1278: App Sensor No. 1 Circuit - High Voltage DTC P1282: App Sensor No. 2 Circuit - Low Voltage DTC P1283: App Sensor No. 2 Circuit - High Voltage DTC P1403: EGR Position Circuit - Low Voltage DTC P1405: EGR Position Circuit - High Voltage DTC P1406: EGR Pintle Position Error DTC P1441: EVAP System Flow During Non-Purge DTC P1510: Throttle Control System - In Limitation DTC P1511: Throttle Control System - Limp Home System Performance DTC P1516: Command Vs. Actual Throttle Position Correlation Error DTC P1519: Throttle Actuator Control (TAC) Module DTC P1523: Throttle Return Performance DTC P1526: TP Sensor Learn Not Done After Reprogramming DTC P1530: Throttle Control System - Amplifier Adjustment DTC P1602: Knock Sensor Control Module Circuit DTC P1630: Theft Deterrent System - ECM In Learn Mode DTC P1631: Theft Deterrent System - Password Incorrect DTC P1632: Theft Deterrent System - Fuel Disabled DTC P1637: Generator "L" Terminal Circuit - Low Input DTC P1669: Abs Unit Expected DTC P1780: Mil External Request By TCM DTC P1845: Torque Limit Management