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.
- P1386Volkswagen · PowertrainInternal Control Module Knock Control Error
- P1387Acura · PowertrainCYP Sensor B No Signal
- P1387Honda · PowertrainCYP Sensor B No Signal
- P1387Infiniti · PowertrainCYP Sensor B No Signal
- P1387Mazda · PowertrainCamshaft Position Timing Solenoid 2 Circuit
- P1387Other · PowertrainVariable Cam Timing Solenoid #2 Circuit Malfunction
- P1387Volkswagen · PowertrainControl Unit Internal Altitude Sensor
- P1388Dodge · PowertrainAuto Shutdown (ASD) Relay Control Circuit Open Or Shorted
- P1388Ford · PowertrainVariable Cam Timing Overretarded Bank 2
- P1388Jeep · PowertrainAuto Shutdown (ASD) Relay Control Circuit Open Or Shorted
- P1388Lincoln · PowertrainVariable Cam Timing Overretarded Bank 2
- P1388Mercury · PowertrainVariable Cam Timing Overretarded Bank 2
- P1388Other · PowertrainVariable Cam Timing Overretarded (Bank #2)
- P1388Plymouth · PowertrainAuto Shutdown ASD Relay Control Circuit Open Or Shorted
- P1388Pontiac · PowertrainAuto Shutdown ASD Relay Control Circuit Open Or Shorted
- P1388Volkswagen · PowertrainControl Unit Internal Throttle Control
- P1389Dodge · PowertrainNo Auto Shutdown (ASD) Relay Output Voltage At PCM
- P1389Ford · PowertrainGlow Plug Circuit High Side Low Input
- P1389Jeep · PowertrainNo Auto Shutdown (ASD) Relay Output Voltage At PCM
- P1389Lincoln · PowertrainGlow Plug Circuit High Side Low Input
- P1389Mercury · PowertrainGlow Plug Circuit High Side Low Input
- P1389Other · PowertrainGlow Plug Circuit High Side Low Input
- P1389Plymouth · PowertrainNo Auto Shutdown ASD Relay Output Voltage At PCM
- P1389Pontiac · PowertrainNo Auto Shutdown ASD Relay Output Voltage At PCM
- P1390Buick · PowertrainWheel Speed Sensor 1, G-Sensor Circuit
- P1390Cadillac · PowertrainWheel Speed Sensor 1, G-Sensor Circuit
- P1390Chevrolet · PowertrainWheel Speed Sensor 1, G-Sensor Circuit
- P1390Chrysler · PowertrainWheel Speed Sensor 1, G-Sensor Circuit
- P1390Dodge · PowertrainTiming Belt Skipped One Tooth Or More
- P1390Ford · PowertrainOctane Adjust Out of Self-Test Range