Car with CAN bus failure codes
Every module blamed the engine ECU. The ECU was fine.
Job from November 2016
Job sheet Diagnostics
- Vehicle
- Car with CAN bus failure codes
- Came in with
- Other control units were reporting a CAN failure of the engine ECU.
- What we found
- Checking the CAN bus signals showed the engine ECU was working. The fault was in the wiring to the body control module.
- What we did
- Repaired the wiring. A reminder not to believe everything the diagnostic machine says.
Rewritten from PK’s original post of November 2016. Old address: /blog/wiring-fault-fault-code/ (now redirects here).