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.
- P1603GM · PowertrainLoss Of SDM Serial Data
- P1603GMC · PowertrainLoss Of SDM Serial Data
- P1603Jaguar · PowertrainEEPROM Malfunction
- P1603Mazda · PowertrainImmobilizer System Fault
- P1603Oldsmobile · PowertrainLoss Of SDM Serial Data
- P1603Other · PowertrainEEPROM Malfunction
- P1603Saturn · PowertrainLoss Of SDM Serial Data
- P1603Volkswagen · PowertrainInternal Control Module Self Check
- P1604BMW · PowertrainControl Module Self Test Speed Monitoring
- P1604Buick · PowertrainLoss Of IPC Serial Data
- P1604Cadillac · PowertrainLoss Of IPC Serial Data
- P1604Chevrolet · PowertrainLoss Of IPC Serial Data
- P1604GM · PowertrainLoss Of IPC Serial Data
- P1604GMC · PowertrainLoss Of IPC Serial Data
- P1604Mazda · PowertrainImmobilizer System Fault
- P1604Oldsmobile · PowertrainLoss Of IPC Serial Data
- P1604Other · PowertrainCode Word Unregestered
- P1604Saturn · PowertrainLoss Of IPC Serial Data
- P1604Volkswagen · PowertrainInternal Control Module Driver Error
- P1605Buick · PowertrainLoss OF HVAX Serial Data
- P1605Cadillac · PowertrainLoss Of HVAX Serial Data
- P1605Chevrolet · PowertrainLoss Of HVAX Serial Data
- P1605Ford · PowertrainPCM Keep Alive Memory Test Error
- P1605GM · PowertrainLoss Of HVAX Serial Data
- P1605GMC · PowertrainLoss Of HVAX Serial Data
- P1605Jaguar · PowertrainKeep Alive Memory Test Failure
- P1605Lexus · PowertrainKnock Control CPU Malfunction
- P1605Lincoln · PowertrainPCM Keep Alive Memory Test Error
- P1605Mazda · PowertrainPowertrain Control Module Keep Alive Memory Test Error
- P1605Mercury · PowertrainPCM Keep Alive Memory Test Error