Medium Speed CAN Communication Bus (-) Low
The CAN-Low signal of the medium-speed bus is shorted to ground. Comfort and body modules can no longer exchange messages and trigger several user-visible faults at once (windows, locking, lighting).
Affected components
- Can low wire
- Body control module
Common causes
- High likelihood: CAN-Low shorted to ground
- Medium likelihood: Water ingress in door connector
- Low likelihood: Gateway module routing CAN messages incorrectly
Possible symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.