DTC codes
Look up an OBD-II fault code: what it means on every car or on your make, 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.
- P1825Volkswagen · PowertrainPressure Control Solenoid 3 Short To B+
- P1826Buick · PowertrainInternal Mode Switch Circuit C High
- P1826Cadillac · PowertrainInternal Mode Switch Circuit C High
- P1826Chevrolet · PowertrainInternal Mode Switch Circuit C High
- P1826Ford · PowertrainTransmission 4-Wheel Drive Low Clutch Relay Circuit To Battery
- P1826GM · PowertrainInternal Mode Switch Circuit C High
- P1826GMC · PowertrainInternal Mode Switch Circuit C High
- P1826Lincoln · PowertrainTransmission 4-Wheel Drive Low Clutch Relay Circuit To Battery
- P1826Mercury · PowertrainTransmission 4-Wheel Drive Low Clutch Relay Circuit To Battery
- P1826Oldsmobile · PowertrainInternal Mode Switch Circuit C High
- P1826Other · PowertrainTransmission 4-Wheel Drive Low Clutch Relay Circuit To Battery
- P1826Saturn · PowertrainInternal Mode Switch Circuit C High
- P1827Other · PowertrainTransmission 4-Wheel Drive Low Clutch Relay Circuit To Ground
- P1828Ford · PowertrainTransmission Transfer Case Counter Clockwise Shift Relay Coil Circuit Failure
- P1828Lincoln · PowertrainTransmission Transfer Case Counter Clockwise Shift Relay Coil Circuit Failure
- P1828Mercury · PowertrainTransmission Transfer Case Counter Clockwise Shift Relay Coil Circuit Failure
- P1828Other · PowertrainTransmission Transfer Case Counter Clockwise Shift Relay Coil Circuit Failure
- P1828Volkswagen · PowertrainPressure Control Solenoid 4 Electrical
- P1829Other · PowertrainTransmission Transfer Case Counter Clockwise Shift Relay Coil Open Circuit
- P1829Volkswagen · PowertrainPressure Control Solenoid 4 Open Short To Ground
- P1830Chrysler · PowertrainOpen Or Shorted Condition Detected In The Clutch Pedal Switch Override Relay Control
- P1830Dodge · PowertrainOpen Or Shorted Condition Detected In The Clutch Pedal Switch Override Relay Control
- P1830Ford · PowertrainTransmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To Battery
- P1830Jeep · PowertrainOpen Or Shorted Condition Detected In The Clutch Pedal Switch Over-Ride Relay Control
- P1830Lincoln · PowertrainTransmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To Battery
- P1830Mercury · PowertrainTransmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To Battery
- P1830Other · PowertrainTransmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To Battery
- P1830Plymouth · PowertrainOpen Or Shorted Condition Detected In The Clutch Pedal Switch Over-Ride Relay Control
- P1830Pontiac · PowertrainOpen Or Shorted Condition Detected In The Clutch Pedal Switch Over-Ride Relay Control
- P1830Volkswagen · PowertrainPressure Control Solenoid 4 Short To B+