Uxxxx · Network
U0140
Lost Communication with Body Control Module
ModerateNetwork ECU
What it means
A module reports it can no longer see the BCM on the network. Often appears together with B-codes from the BCM itself.
Common causes
Listed in rough order of frequency. Verify with vehicle-specific service info before parts replacement.
- 01BCM unpowered (fuse, relay, harness)
- 02BCM internal failure
- 03CAN bus fault to the BCM segment
- 04Recent BCM swap without proper coding
Affected systems
ECUs and subsystems that report or are affected by this code.
Body Control ModuleCAN bus
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