OBD fault code library
Look up any P or U code to see what it means, what causes it, the parts involved and how it gets fixed.
Free on OBD DashX
Looking for real-world repair data?
OBD DashX shows which problems come with each code, how often they show up in other vehicles, and how to fix them — step by step.
- Real-world fix data
- How often it happens
- Step-by-step repairs
Fault codes
P1491
EVAP Canister Purge Regulator Valve 2 Open Circuit
BMW
Auxiliary Emissions Control
Low severity
P1001
Key On/Engine Running Not Able To Complete
Chevrolet
Vehicle Speed and Idle Control System
High severity
P1002
Ignition Key Off Timer Performance Too Slow
Chevrolet
Vehicle Speed and Idle Control System
High severity
Scan your own car
Read and clear fault codes, live data and service resets with the CaRPM app.