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Engine Controls - Self-Diagnostics Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Test Equipment Summary Diagnostic Trouble Code Definitions Diagnostic Tests Notes DTC P0031: Ho2S Heater (Front) Circuit Low DTC P0032: Ho2S Heater (Front) Circuit High DTC P0037: Ho2S Heater (Rear) Circuit Low DTC P0038: Rear Ho2S Heater Circuit High DTC P0101: Mass Airflow Sensor Circuit Range/Performance Problem DTC P0102: Mass Airflow Sensor Circuit, Low Input DTC P0103: Mass Airflow Sensor Circuit, High Input DTC P0106: BARO Circuit, Performance Problem DTC P0107: BARO Circuit, Low Input DTC P0108: BARO Circuit, High Input DTC P0111: Intake Air Temperature Sensor Circuit, Performance Problem DTC P0112: Intake Air Temperature Sensor Circuit, Low Input DTC P0113: Intake Air Temperature Sensor Circuit, High Input 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 Fuel Control DTC P0126: Coolant Thermostat Stuck Open DTC P0128: Coolant Thermostat Stuck Open DTC P0131: Ho2S (Front) No Inversion, Low Voltage Stuck DTC P0132: Ho2S (Front) No Inversion, High Voltage Stuck DTC P0133: Ho2S (Front) Circuit, Slow Response DTC P0134: Ho2S (Front) Circuit, No Activity Detected DTC P0138: Ho2S (Rear) Circuit, High Input DTC P0140: Ho2S (Rear) Circuit, No Activity Detected DTC P0171: Fuel Trim, Too Lean DTC P0172: Fuel Trim, Too Rich DTC P0300: Random Misfire Detected DTC P0301-P0304: Cylinders No. 1-4 Misfire Detected DTC P0325: Knock Sensor Circuit Malfunction DTC P0335: Crankshaft Position Sensor Circuit Malfunction DTC P0340: Camshaft Position Sensor Circuit Malfunction DTC P0401: EGR System, Insufficient Flow DTC P0402: EGR System, Excessive Flow DTC P0421: Catalyst System, Efficiency Below Threshold DTC P0442: EVAP Control System, Small Leak Detected DTC P0443: EVAP Control System Purge Control Valve, Circuit Malfunction DTC P0451: Fuel Tank Pressure Sensor, Performance Problem DTC P0452: EVAP Control System Pressure Sensor, Low Input DTC P0453: EVAP Control System Pressure Sensor, High Input DTC P0455: EVAP Control System Leak Detected, Blockage Or Large Leak DTC P0456: EVAP Control System Leak Detected, Very Small Leak DTC P0461: Fuel Gauge Sending Unit Circuit, Range/Performance Problem DTC P0462: Fuel Gauge Sending Unit Circuit, Low Input DTC P0463: Fuel Gauge Sending Unit Circuit, High Input DTC P0464: Fuel Gauge Sending Unit Circuit, Slosh Check DTC P0480: Cooling Fan Relay Circuit DTC P0500: Vehicle Speed Sensor Malfunction DTC P0505: Idle Air Control Valve Circuit Malfunction DTC P0506: Idle Control System, Rpm Less Than Expected DTC P0507: Idle Control System, Rpm Greater Than Expected DTC P0550: Power Steering Pressure Switch Circuit Malfunction DTC P0660: Variable Inertia Charging System Solenoid Valve Circuit Malfunction DTC P0703: Brake Switch Input Circuit Malfunction DTC P0704: Clutch Switch Input Circuit Malfunction DTC P0705: Neutral Switch Input Circuit Malfunction DTC P1250: Pressure Regulator Control Solenoid Valve Malfunction DTC P1449: Canister Drain Cut Valve Open Or Short DTC P1450: EVAP Control System Malfunction, Excessive Vacuum DTC P1487: EGR Boost Sensor Solenoid Valve Circuit Malfunction DTC P1496: EGR Valve Solenoid Coil No. 1 Open Or Short DTC P1497: EGR Valve Solenoid Coil No. 2 Open Or Short DTC P1498: EGR Valve Solenoid Coil No. 3 Open Or Short DTC P1499: EGR Valve Solenoid Coil No. 4 Open Or Short DTC P1512: Variable Tumble Control System Stuck Closed DTC P1562: Pcm +BB Voltage Low DTC P1569: Variable Tumble Control System Solenoid Valve Circuit, Low Input DTC P1570: Variable Tumble Control System Solenoid Valve Circuit, High Input DTC P1631: Generator Output Voltage Signal, No Electricity DTC P1632: Battery Voltage Circuit Malfunction DTC P1633: Battery Overcharge DTC P1634: Generator Terminal "B" Circuit Open Reference Voltage Test