Body Control Module (BCM) Supply Voltage Circuit Low
The BCM has detected low voltage in its supply circuit.
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 needs a certain voltage to work right. If the voltage drops below about 9 volts, it can't do its job properly – this can happen if there's a bad connection or a weak battery.
What the computer is actually seeing
The BCM expects a supply voltage between 9 to 16 volts for proper operation. If the voltage drops below 9 volts, it triggers this fault code.
What a healthy reading looks like
BCM supply voltage should be 12-14 volts when the engine is running; an acceptable value is not lower than 9 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.
- 11. Check battery voltage; it should be 12.6 volts or higher when the engine is off.
- 22. Inspect battery terminals and connections for corrosion or looseness; clean and tighten as necessary.
- 33. Test the voltage at the BCM connector (typically a grey or black connector) with the ignition on; should be between 11-14 volts.
- 44. If voltage is low at the connector, trace wiring back to the battery ensuring no shorts or damage.
- 55. If all wiring is good and voltage is normal, consider the BCM as a potential failure point.
Common causes
- Weak battery or loose connections
- Corroded connectors or damaged wiring
- Faulty BCM or internal failure
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderately safe, but you could experience electrical issues and loss of important functions.
Will this code come back after clearing it?
Possibly, especially if there's an underlying issue like bad connections or a failing BCM.
Why did this code happen after a battery replacement?
A loose connection or insufficient charging may have triggered the low voltage condition.
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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