Body Control Module - Voltage Supply Circuit Low
The body control module is detecting low voltage in its power supply circuit.
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What it means (plain English)
The body control module, which controls various electrical systems in the vehicle, is getting less voltage than it needs to work correctly.
What the computer is actually seeing
The Body Control Module (BCM) expects around 12V from its power circuit. When the voltage drops below approximately 10.5V, it triggers this code.
What a healthy reading looks like
Expected voltage at BCM power supply is between 12V and 14.5V when the engine is running and accessories are off.
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 the battery voltage with a multimeter. It should be between 12.4V to 12.6V for a fully charged battery.
- 22. Inspect the wiring and connectors leading to the body control module for signs of corrosion or damage. Repair as needed.
- 33. With the engine running, measure the voltage at the BCM power supply terminal; it should be between 12V and 14.5V. If it's low, check the alternator output and battery condition.
- 44. If all checks are good but the code persists, consider testing or replacing the body control module.
Common causes
- Corroded or damaged wiring in the power supply circuit
- Faulty body control module
- Weak battery or charging system issues
- Connector issues at BCM or battery terminals
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but you may experience electrical issues like non-functioning lights or windows.
Will this code come back after clearing?
It may return if the underlying issue isn't fixed, like a bad connection or faulty BCM.
Why does this code appear alongside other BCM-related codes?
Multiple codes can indicate issues with the BCM or shared wiring faults that affect its operation.
Working a real vehicle right now?
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