Body Control Module (BCM) Loss of Communication
The BCM is not able to communicate with other modules.
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)
Inside the vehicle, the Body Control Module (BCM) runs the electrical systems like lights and locks. If it stops talking to other parts, they won't work properly, and you'll see issues with those systems.
What the computer is actually seeing
The BCM tries to send messages over the network but receives no response, indicated by lost communication signals which may involve checking voltage levels (typically around 2.5V to 5V for data lines).
What a healthy reading looks like
Data lines should show a fluctuating voltage near 2.5V when idle and between 2V to 3V when communicating.
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.
- 1Check the vehicle battery voltage; should be above 12.4 volts. If low, charge and retest.
- 2Inspect wiring and connectors leading to the BCM for damage or corrosion. Repair if found.
- 3Use a scan tool to check for other related codes. If additional codes exist, address them first.
- 4Confirm that the BCM is receiving proper power and ground. Power supply should be 12V and ground should show continuity to battery ground.
Common causes
- Faulty Body Control Module
- Wiring issues like short circuits or open circuits in the CAN bus
- Bad connectors or corroded pins
- Low battery voltage or poor ground connections
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive, but electrical features may not work reliably, so proceed with caution.
Will the code come back after clearing it?
If the root issue isn’t fixed, yes, it’s likely to return.
Why does this code appear with other codes?
Communication issues often affect multiple modules, causing them to throw related codes.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →