Lost Communication with Body Control Module (BCM)
The engine control module can't communicate 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 computer that runs the engine doesn't get signals from the body control module, which handles things like lights and doors, leading to possible issues in operation.
What the computer is actually seeing
The ECM (engine control module) is not receiving data from the BCM, which affects various vehicle functions like locking/unlocking doors and lighting systems.
What a healthy reading looks like
BCM should respond with a communication message in under 300 milliseconds when queried by the ECM.
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 between the BCM and ECM; repair any visible damage.
- 22. Check for common issues like blown fuses related to the BCM circuit.
- 33. Use a scan tool to read all codes; confirm that U0144 is present and not being masked by other codes.
- 44. Clear the DTCs and perform a key cycle; check for code return.
- 55. If the code returns, attempt to establish communication with the BCM using the scan tool; if no communication, proceed to the next step.
- 66. Test the voltage at the BCM connector with the ignition on; you should see around 12V on the power circuits. If absent, trace power supply issues.
- 77. If voltage is present but communication fails, consider replacing the BCM.
Common causes
- Loose or corroded connectors at the BCM or ECM
- Wiring harness damage between BCM and ECM
- Faulty body control module
- Failed engine control module
- Controller communication error due to ignition issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but monitor for any significant electrical issues or problems with lighting.
Will this code come back if I clear it?
Yes, if the underlying issue isn't fixed, the code will likely come back.
Why might it pair with other communication codes?
Multiple communication failures can happen if there's an issue with the CAN bus or if there's brittleness in the wiring harness.
Working a real vehicle right now?
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