Battery Voltage Input Signal High
The body control module detects a high voltage from the battery input signal.
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What it means (plain English)
The body control module thinks the battery voltage is too high, which usually means there's a problem with the battery or the electrical connections.
What the computer is actually seeing
The body control module is monitoring the battery voltage input, expecting a range between 12.0V and 14.5V while the engine is running. Anything above 15V triggers this code.
What a healthy reading looks like
Normal battery voltage should be between 12.0V (off) and 14.5V (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.
- 11. Check battery voltage with a multimeter. Should read between 12.0V (off) and 14.5V (running). If above 15V, suspect overcharging.
- 22. Inspect battery terminals and cables for corrosion or loose connections. Repair or clean as necessary.
- 33. Test the alternator output. Should not exceed 14.5V at idle. If above, the alternator may be overcharging.
- 44. Check for any electrical shorts in the wiring harness related to the battery and body control connections.
- 55. If all previous checks are normal, consider testing or replacing the body control module.
Common causes
- Faulty battery
- Overcharging alternator
- Bad ground connection
- Damaged wiring harness
- Faulty body control module
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate risk; if the battery is overcharging, it can damage electrical components, so fix it soon.
Will this code come back after clearing?
If the underlying issue isn't resolved, the code will likely return.
Why does this code pair with other codes?
Often, related codes indicate multiple faults in the battery or charging system that can overlap.
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