Network & communication
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Lights the check engine lamp
U0143: Lost Communication with Body Control Module C
Standardized SAE J2012 code · U01xx — Lost communication with modules
What does U0143 mean?
A third body control module (BCM "C") has dropped off the bus. Comfort, lighting or door functions on the affected zone stop working.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
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
Common causes
- High BCM C unpowered
- Low Gateway module routing CAN messages incorrectly
- Low CAN terminating resistor (120 Ω) drifted out of spec
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of U0143 on the same make and model first.
U0143 in the community
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