Body Control Module (BCM) Communication Error
There’s a communication issue with the Body Control Module.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The Body Control Module isn't talking properly with the other systems in the vehicle, which can mess things up like lights and locks.
What the computer is actually seeing
The computer detects abnormal voltage levels or missing signals between the BCM and connected components during its communication checks.
What a healthy reading looks like
Expected communication voltage should be between 0.5V and 5V. Look for a stable signal pulse when activating involved circuits.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connectors for the Body Control Module. Look for corrosion or loose connections.
- 22. Use a multimeter to check the voltage on the communication lines; you should see between 0.5V and 5V when signals are sent.
- 33. Check other modules in the network (like the ignition control module) for similar fault codes. If found, this module might be causing the communication issue.
- 44. If previous steps are clear, replace the Body Control Module and re-test.
Common causes
- Loose or corroded connectors at the BCM
- Shorted wiring harness or damaged wire insulation
- Faulty Body Control Module itself
- Other modules in the communication network having issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s drivable, but electrical systems might not function correctly, which could be a safety issue.
Will this code come back after clearing?
If the underlying issue isn't fixed, it will likely return.
Why does it pair with other codes?
Multiple codes often relate to the communication network; issues in one module can affect others.
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