OBD-II code · Network
U0075 Control Module Communication Bus "B" Performance
Bus B is operational but performance is degraded — error frames or out-of-spec timing. Modules on this bus may behave erratically.
Is it safe to drive with U0075?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyCorrosion or poor contact in connectors
- PossibleOne module sending malformed frames
- 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
- 1–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Can Bus Wiring, Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.