Lost Communication with Battery Energy Control Module 'A'
The vehicle has lost communication with the Battery Energy Control Module (BECM).
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What it means (plain English)
The car's computer can't talk to the battery control module which manages energy use and storage, causing potential electrical issues.
What the computer is actually seeing
The main control module detects that it can no longer communicate with the BECM over the CAN bus, signaling a communication error.
What a healthy reading looks like
Normally, the BECM should respond to requests within 20 milliseconds; a delay beyond that indicates a problem.
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. Check battery voltage; it should be between 12.4V to 12.7V. If low, recharge or replace the battery.
- 22. Visually inspect the wiring and connectors to the BECM for damage or corrosion. Repair any issues found.
- 33. Use a scan tool to check for additional codes related to the BECM. If present, troubleshoot those codes first.
- 44. Measure the resistance of the CAN bus wiring; it should be around 60 ohms. Any significant deviation indicates a wiring problem.
- 55. If the above checks are good, test or replace the BECM and recheck for communication.
Common causes
- Faulty BECM
- Wiring issues in the CAN bus
- Corroded connectors
- Low battery voltage
- Faulty main control module
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive if this code is active?
It's best not to drive because you may lose power to essential systems.
Will this code come back after clearing it?
If the underlying issue isn't fixed, the code will likely reappear after a short time.
What happens if I ignore this code?
Ignoring it could lead to electrical system failures, affecting drivability.
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