Manufacturer-specific OBD-II codes
A manufacturer-specific code is defined by the car maker. It usually has 1 as the second character (P1xxx, B1xxx, C1xxx, U1xxx), and the same code can mean different things on different makes.
How to find the meaning of a maker code
- Use a scanner that supports your make: many show the maker's own description next to the code.
- Check the factory service manual or ask a dealer service desk for your exact model and engine.
- Look for technical service bulletins (TSBs) and recalls with your VIN: check your VIN.