OBD-II code · Network
U0013 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).
Is it safe to drive with U0013?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyCAN-Low shorted to ground
- PossibleWater ingress in door connector
- Less likelyGateway module routing CAN messages incorrectly
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
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Can Low Wire, Body Control Module
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.