OBD-II code · Network
U0143 Lost Communication with Body Control Module C
A third body control module (BCM "C") has dropped off the bus. Comfort, lighting or door functions on the affected zone stop working.
Is it safe to drive with U0143?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyBCM C unpowered
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
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
- 0.5–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Body Control Module, Can Bus Wiring
Related codes
- U0141Lost Communication with Body Control Module A
- U0142Lost Communication with Body Control Module B
- U0140Lost Communication with Body Control Module
- U0144Lost Communication with Personalization Module "B"
- U0145Lost Communication with Restraints Control Module Auxiliary
- U0146Lost Communication with Gateway "A"
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.