Lost Communication With Body Control Module B
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.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $200 - $800 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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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
-
Check BCM B power and ground circuits
-
Inspect BCM B connector -- often located at rear of vehicle
-
Verify CAN bus wiring to BCM B
-
Check for water intrusion in BCM B area
-
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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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