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
P1841
Communication error between ECM and Transmission Control module
Audi
Computer Output Circuit
High severity
P1844
Internal malfunction detected in Central electronics control module
Audi
Computer Output Circuit
High severity
P1849
Internal malfunction detected in Transmission control module
Audi
Computer Output Circuit
High severity
P1853
Internal malfunction detected in Brakes control module
Audi
Computer Output Circuit
High severity
Scan your own car
Read and clear fault codes, live data and service resets with the CaRPM app.