Body Control Module - Battery Voltage Low
The battery voltage supply to the body control module is below acceptable levels.
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 (BCM) isn't getting enough power from the vehicle's battery, which could be due to a weak battery, bad connections, or a faulty BCM itself.
What the computer is actually seeing
The BCM monitors battery voltage and will trigger a fault code if it drops below 9 volts for more than 5 seconds while the vehicle is running.
What a healthy reading looks like
Expected battery voltage should be between 12.6 and 14.7 volts when the engine is running.
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 the battery voltage using a multimeter; it should be above 12.6 volts. If it's below, recharge or replace the battery.
- 2Inspect the battery terminals for corrosion or loose connections. Clean and tighten as necessary.
- 3Check the wiring and connectors going to the body control module for any signs of damage or poor connections.
- 4If battery and connections are good, use a scan tool to verify if the BCM is functioning correctly. If it’s not, consider replacing the BCM.
Common causes
- Weak or dead battery
- Corroded battery terminals
- Faulty wiring or connectors to the BCM
- Defective body control module
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive the vehicle?
Yes, but do it at your own risk; electrical systems may malfunction, affecting lights, windows, or locks.
Will this code come back?
It can come back if the underlying issue with the battery or connections isn't resolved.
Why do I see this with other codes?
BCM issues often present alongside low voltage codes due to shared circuitry and power supply faults.
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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