Network
generic / SAE
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.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number1 / 42
Possible causes
- Secondary BCM unpowered high
- Water ingress into rear BCM medium
- Gateway module routing CAN messages incorrectly low
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 100–1800 €
- Estimated time: 1–6 h
- Component: body control module
- Component: can bus wiring
- MIL / check engine light
Sources
References
sae:J2012