OBD-II code · Network
U0142 Lost Communication with Body Control Module B
The Body Control Module B has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. A second body controller is silent; lighting, locks, or comfort functions can fail. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
Is it safe to drive with U0142?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySecondary BCM unpowered
- PossibleWater ingress into rear BCM
- 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
- Body Control Module, Can Bus Wiring
Related codes
- U0141Lost Communication with Body Control Module A
- U0143Lost Communication with Body Control Module C
- U013FLost Communication With Pedestrian Alert Control Module
- U0140Lost Communication with Body Control Module
- U0144Lost Communication with Personalization Module "B"
- U0145Lost Communication with Restraints Control Module Auxiliary
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.