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 is having trouble talking to other systems, making functions like lights and locks unreliable.
What the computer is actually seeing
The BCM expects regular data signals about system status every 100 milliseconds. If it doesn't see the right signals, it sets this code.
What a healthy reading looks like
BCM communication should register a signal voltage between 0.5 to 5 volts with a response time under 100 ms.
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 wiring and connectors for any damage or corrosion - they should be intact and making a good connection.
- 2Verify that the BCM is receiving power and ground (should see 12V on battery feed, and ground should be close to 0V). If power or ground is missing, trace back to find the fault.
- 3Check the communication lines for shorts or opens using a multimeter - resistance should be low (near 0 ohms) if the circuit is intact.
- 4If wiring and connectors are good, use a scan tool to verify communication with other modules. If other modules are unresponsive, focus on the network issues rather than the BCM itself.
- 5If everything checks out but the code persists, consider replacing the BCM.
Common causes
- Faulty wiring or connectors to the BCM
- Bad BCM unit
- Faulty control modules that the BCM communicates with
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's usually drivable, but expect erratic behavior in features like lights and locks.
Will this code come back after resetting?
If the underlying issue isn't fixed, it'll likely return.
Why does this code pair with other codes?
This code often appears with others reflecting issues in systems that depend on the BCM for operation.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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