Powertrain fault codes
14821 Powertrain 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.
- P1844GMC · PowertrainTorque Reduction Signal Circuit Desired By TCM
- P1844Oldsmobile · PowertrainTorque Reduction Signal Circuit Desired By TCM
- P1844Other · PowertrainTransmission Transfer Case Differential Lock-Up Feedback Switch Short Circuit To Battery
- P1844Saturn · PowertrainTorque Reduction Signal Circuit Desired By TCM
- P1844Volkswagen · PowertrainCheck DTC Memory Of Central Electronic Control ECU
- P1845Buick · PowertrainTransmission Gear Ratio Output Circuit
- P1845Cadillac · PowertrainTransmission Gear Ratio Output Circuit
- P1845Chevrolet · PowertrainTransmission Gear Ratio Output Circuit
- P1845GM · PowertrainTransmission Gear Ratio Output Circuit
- P1845GMC · PowertrainTransmission Gear Ratio Output Circuit
- P1845Oldsmobile · PowertrainTransmission Gear Ratio Output Circuit
- P1845Other · PowertrainTransmission Transfer Case Differential Lock-Up Feedback Switch Short Circuit To Ground
- P1845Saturn · PowertrainTransmission Gear Ratio Output Circuit
- P1846Ford · PowertrainTransmission Transfer Case Contact Plate A Circuit Failure
- P1846Lincoln · PowertrainTransmission Transfer Case Contact Plate A Circuit Failure
- P1846Mercury · PowertrainTransmission Transfer Case Contact Plate A Circuit Failure
- P1846Other · PowertrainTransmission Transfer Case Contact Plate 'A' Circuit Failure
- P1847Buick · Powertrain2-3 Shift Solenoid Circuit High Voltage
- P1847Cadillac · Powertrain2-3 Shift Solenoid Circuit High Voltage
- P1847Chevrolet · Powertrain2-3 Shift Solenoid Circuit High Voltage
- P1847GM · Powertrain2 3 Shift Solenoid Circuit High Voltage
- P1847GMC · Powertrain2 3 Shift Solenoid Circuit High Voltage
- P1847Oldsmobile · Powertrain2-3 Shift Solenoid Circuit High Voltage
- P1847Other · PowertrainTransmission Transfer Case Contact Plate 'A' Open Circuit
- P1847Saturn · Powertrain2-3 Shift Solenoid Circuit High Voltage
- P1847Volkswagen · PowertrainCheck DTC Memory Of Brake System ECU
- P1848Other · PowertrainTransmission Transfer Case Contact Plate 'A' Short Circuit To Battery
- P1848Volkswagen · PowertrainCheck DTC Memory Of Engine ECU
- P1849Other · PowertrainTransmission Transfer Case Contact Plate 'A' Short Circuit To Ground
- P1849Volkswagen · PowertrainCheck DTC Memory Of Transmission ECU