Buick fault codes
403 Buick 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.
- P1871Buick · PowertrainUndefined Gear Ratio
- P1873Buick · PowertrainTCC Stator Temp. Switch Circuit Low
- P1874Buick · PowertrainTCC Stator Temp. Switch Circuit High
- P1875Buick · Powertrain4WD Low Switch Circuit
- P1884Buick · PowertrainTCC Enable/Shift Light Circuit
- P1886Buick · PowertrainShift Timing Solenoid
- P1887Buick · PowertrainTCC Release Switch Circuit
- P1890Buick · PowertrainECM Data Input Circuit
- P1891Buick · PowertrainThrottle Position Sensor PWM Signal Low
- P1892Buick · PowertrainThrottle Position Sensor PWM Signal High
- P1893Buick · PowertrainEngine Torque Signal Low Voltage
- P1894Buick · PowertrainEngine Torque Signal High Voltage
- P1895Buick · PowertrainTCM To ECM Torque Reduction Circuit