Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test C : U0142:87: Notes
U0142:87
Refer to Module Communications Network for schematic and connector information.
Normal Operation and Fault Conditions
The Auxiliary Lighting Control Module (ALCM) will show as the BCMB on the scan tool. REFER to: Communications Network - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0142:87 | Lost Communication With Body Control Module "B": Missing Message | A continuous memory DTC that sets in the BCM if data messages from the BCMB through the GWM are missing. |
Possible Sources
- Communication network concern
- Battery voltage concern
- GWM concern
- Auxiliary Lighting Control Module (ALCM) (BCMB)
- BCM
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.