Lost Communication With Body Control Module B
What does U0142 mean?
The U0142 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Body Control Module B. This is a moderate severity code.
Common Symptoms
- Secondary body electrical malfunctions
- Rear lighting issues
- Rear power accessories inoperative
- Trailer interface not working
Probable Causes (Ranked by Likelihood)
- Failed body control module B Very High
- CAN bus wiring fault to BCM B High
- BCM B connector corrosion Moderate
- BCM B power supply failure Low
Step-by-Step Diagnostic Procedure
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Check BCM B power and ground circuits
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Inspect BCM B connector -- often located at rear of vehicle
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Verify CAN bus wiring to BCM B
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Check for water intrusion in BCM B area
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Replace BCM B if communication lost
Frequently Asked Questions
Can I drive with code U0142?
Drive short distances only. Lost communication codes indicate a module has stopped communicating on the vehicle network. The affected system may not function correctly.
What causes U0142?
The most common cause is a failed module or a wiring issue in the CAN bus network. Failed body control module B is the most likely cause. Power supply, ground, and connector issues should be checked before replacing any module.
Is U0142 expensive to fix?
Repair costs range from $200 - $800 (parts and labor). Wiring repairs are on the lower end, while module replacement is on the higher end. The module may also need to be programmed after replacement.