GMC fault codes
402 GMC OBD-II fault codes: what each one means, and how to track it down.
How to read a code
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 4
- AreaAuxiliary emission controls
- 20
- FaultThe specific fault in that area
Read the code
Note every stored and pending code your scanner shows, such as P0420.
Find it
Search by code or by words. For a manufacturer code (P1, B1, C1, U1) pick your make: its meaning differs by make.
Open the code
Its page explains the symptoms, likely causes, the checks to run and the fixes.
- P1873GMC · PowertrainTCC Stator Temp Switch Circuit Low
- P1874GMC · PowertrainTCC Stator Temp Switch Circuit High
- P1875GMC · Powertrain4WD Low Switch Circuit
- P1884GMC · PowertrainTCC Enable Shift Light Circuit
- P1886GMC · PowertrainShift Timing Solenoid
- P1887GMC · PowertrainTCC Release Switch Circuit
- P1890GMC · PowertrainECM Data Input Circuit
- P1891GMC · PowertrainThrottle Position Sensor PWM Signal Low
- P1892GMC · PowertrainThrottle Position Sensor PWM Signal High
- P1893GMC · PowertrainEngine Torque Signal Low Voltage
- P1894GMC · PowertrainEngine Torque Signal High Voltage
- P1895GMC · PowertrainTCM To ECM Torque Reduction Circuit