Lost Communication with Body Control Module (BCM)
The engine control module isn't communicating 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)
Inside the vehicle, different control modules need to talk to each other. If the engine control module (ECM) can't get data from the body control module (BCM), you see this code. It’s like a phone call dropping; the ECM can’t hear what the BCM is saying.
What the computer is actually seeing
The ECM expects a response from the BCM within a certain time frame (typically less than 200 milliseconds). If no response is received, it triggers this code.
What a healthy reading looks like
BCM response expected within 200 milliseconds; check voltage levels at the BCM (should be between 10-14 volts).
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 battery voltage at the BCM — should be between 10-14 volts.
- 2Inspect wiring and connectors to the BCM for damage or corrosion. Repair as needed.
- 3Verify communication lines for continuity — less than 5 ohms resistance reconnecting both modules.
- 4Check for other fault codes that may indicate a higher-level issue. If other codes exist, address those first.
Common causes
- Faulty body control module (BCM)
- Damaged wiring or connectors between ECM and BCM
- Corroded connectors
- Software issues in either module
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe if no other symptoms are present, but you may lose some electrical features (like interior lights or power windows). Fix soon.
Will this code come back after clearing?
If the underlying issue is not fixed, yes. It will typically return after a few driving cycles.
Does this code pair with any other issues?
Yes, if there's a BCM issue, you might also see codes related to lights, locks, or other body functions.
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