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.
- P1807Other · PowertrainTransmission 4-Wheel Drive High Indicator Short Circuit To Ground
- P1808Other · PowertrainTransmission 4-Wheel Drive Low Indicator Circuit Failure
- P1809Other · PowertrainTransmission 4-Wheel Drive Low Indicator Open Circuit
- P1810Other · PowertrainTFP Valve Position Switch Circuit/ Transmission 4-Wheel Drive Low Indicator Short Circuit To Battery
- P1811Other · PowertrainTransmission 4-Wheel Drive Low Indicator Short Circuit To Ground
- P1812Other · PowertrainTransmission 4-Wheel Drive Mode Select Circuit Failure
- P1813Other · PowertrainTransmission 4-Wheel Drive Mode Select Open Circuit
- P1814Other · PowertrainTransmission 4-Wheel Drive Mode Select Short Circuit To Battery
- P1815Other · PowertrainTransmission 4-Wheel Drive Mode Select Short Circuit To Ground
- P1816Other · PowertrainTransmission Neutral Safety Switch Circuit Failure
- P1817Other · PowertrainTransmission Neutral Safety Switch Open Circuit
- P1818Other · PowertrainTransmission Neutral Safety Switch Short Circuit To Battery
- P1819Other · PowertrainTransmission Neutral Safety Switch Short Circuit To Ground
- P1820Other · PowertrainTransmission Transfer Case Clockwise Shift Relay Coil Circuit Failure
- P1821Other · PowertrainTransmission Transfer Case Clockwise Shift Relay Coil Open Circuit
- P1822Other · PowertrainTransmission Transfer Case Clockwise Shift Relay Coil Short Circuit To Battery
- P1823Other · PowertrainTransmission Transfer Case Clockwise Shift Relay Coil Short Circuit To Ground
- P1824Other · PowertrainTransmission 4-Wheel Drive Clutch Relay Circuit Failure
- P1825Other · PowertrainTransmission 4-Wheel Drive Clutch Relay Open Circuit
- P1826Other · PowertrainTransmission 4-Wheel Drive Low Clutch Relay Circuit To Battery
- P1827Other · PowertrainTransmission 4-Wheel Drive Low Clutch Relay Circuit To Ground
- P1828Other · PowertrainTransmission Transfer Case Counter Clockwise Shift Relay Coil Circuit Failure
- P1829Other · PowertrainTransmission Transfer Case Counter Clockwise Shift Relay Coil Open Circuit
- P1830Other · PowertrainTransmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To Battery
- P1831Other · PowertrainTransmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To Ground
- P1832Other · PowertrainTransmission Transfer Case Differential Lock-Up Solenoid Circuit Failure
- P1833Other · PowertrainTransmission Transfer Case Differential Lock-Up Solenoid Open Circuit
- P1834Other · PowertrainTransmission Transfer Case Differential Lock-Up Solenoid Short Circuit To Battery
- P1835Other · PowertrainTransmission Transfer Case Differential Lock-Up Solenoid Short Circuit To Ground
- P1836Other · PowertrainTransmission Transfer Case Front Shaft Speed Sensor Circuit Failure