OBD-II code · Network
U0016 Medium Speed CAN Communication Bus Off
A controller on the medium-speed comfort bus has shut its transceiver off after too many consecutive transmit errors. Comfort and body functions stop responding until the bus recovers or is repaired.
Is it safe to drive with U0016?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyWiring short forces bus-off state
- PossibleOne failing node corrupts traffic
- 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
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Body Control Module, Can Bus Wiring
Related codes
- U0013Medium Speed CAN Communication Bus (-) Low
- U0014Medium Speed CAN Communication Bus (-) High
- U0015Medium Speed CAN Communication Bus (-) Shorted to Bus (+)
- U0017Medium Speed CAN Communication Bus (+) Open
- U0018Medium Speed CAN Communication Bus (+) Low
- U0019Medium Speed CAN Communication Bus (+) High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.