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General Motors Fault Codes

23 General Motors generator fault/alarm codes with symptom, cause and remedy — compiled from General Motors service and controller documentation.

Fault / alarm codes

23
CodeMeaning / symptomCauseRemedy Models affected
12Diagnostic Trouble Code (DTC) system operatingGeneral Motors 8.1 L Engines
DTC 13Oxygen (02) Sensor 1 Circuit InactiveGeneral Motors 8.1 L Engines
DTC 14Engine Coolant Temperature (ECT) Sensor Circuit. Low Temperature Indicated.General Motors 8.1 L Engines
DTC 15Engine Coolant Temperature (ECT) Sensor Circuit. High Temperature Indicated.General Motors 8.1 L Engines
DTC 21Throttle Position (TP) Sensor Circuit. High Signal Voltage Indicated.General Motors 8.1 L Engines
DTC 22Throttle Position (TP) Sensor Circuit. Low Signal Voltage Indicated.General Motors 8.1 L Engines
DTC 23Intake Air Temperature (IAT) Sensor Circuit. Low Temperature Indicated.General Motors 8.1 L Engines
DTC 24Vehicle Speed Sensor (VSS) Circuit Inactive.General Motors 8.1 L Engines
DTC 25Intake Air Temperature (IAT) Sensor Circuit. High Temperature Indicated.General Motors 8.1 L Engines
DTC 31Governor System InactiveGeneral Motors 8.1 L Engines
DTC 32Exhaust Gas Recirculation (EGR) Valve Circuit Inactive.General Motors 8.1 L Engines
DTC 33Manifold Absolute Pressure (MAP) Sensor Circuit. High Signal Voltage Indicated.General Motors 8.1 L Engines
DTC 34Manifold Absolute Pressure (MAP) Sensor Circuit. Low Signal Voltage Indicated.General Motors 8.1 L Engines
DTC 41Ignition Control (IC) H Fault.Test for open in IC timing control circuit, check connections, replace components as necessary.General Motors 4.3/5.0/5.7 L Engines, General Motors 8.1 L Engines
DTC 44Knock Sensor (KS) 1 Circuit Inactive.General Motors 8.1 L Engines
DTC 51Calibration Checksum Failure.General Motors 8.1 L Engines
DTC 54Oxygen (02) Sensor 1 Low Voltage. Lean Exhaust Indicated.General Motors 8.1 L Engines
DTC 55Oxygen (02) Sensor 1 Low Voltage. Rich Exhaust Indicated.General Motors 8.1 L Engines
DTC 61High Fuel Pressure Indicated.General Motors 8.1 L Engines
DTC 62Low Fuel Pressure Indicated.General Motors 8.1 L Engines
DTC 63High Fuel Temperature Indicated.General Motors 8.1 L Engines
DTC 64Low Fuel Temperature Indicated.General Motors 8.1 L Engines
DTC 81Crankshaft Position (CKP) Sensor Circuit Fault.General Motors 4.3/5.0/5.7 L Engines, General Motors 8.1 L Engines

Compiled from General Motors service manuals and controller documentation. Cause/remedy shown where extracted; always verify against the manual for your exact model.

Common questions

What does General Motors fault code DTC 41 mean?

Ignition Control (IC) H Fault.. Remedy: Test for open in IC timing control circuit, check connections, replace components as necessary..