Battery Voltage Signal Invalid
The body control module (BCM) has detected an issue with the battery voltage signal.
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 car's computer isn't getting a proper voltage reading from the battery, which can be caused by weak connections or a dying battery.
What the computer is actually seeing
The BCM expects a stable voltage between 12.5 to 14.5 volts when the vehicle is running. When it sees out-of-range values, it triggers this code.
What a healthy reading looks like
Battery voltage should be 12.5V to 14.5V with the engine running, and above 12V when 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 battery connections for tightness and corrosion. Repair any issues found. Decision: If fixed, clear codes and retest; if not, proceed to step 2.
- 22. Measure battery voltage at rest (engine off). You should see at least 12V. Decision: If below 12V, replace the battery; if okay, go to step 3.
- 33. Start the engine and measure voltage at the battery terminals; it should be between 13.5V to 14.5V. Decision: If not, check the alternator output; if okay, go to step 4.
- 44. Inspect wiring and connectors between the battery and BCM for damage. Repair as necessary. Decision: If repaired, clear codes and retest; if all good, consider BCM replacement.
Common causes
- Weak battery connections
- Faulty battery
- Damaged wiring or connectors
- Faulty BCM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe, but you may experience electrical issues or a dead battery if not addressed.
Will this code come back?
If the underlying issue isn't fixed (like a bad battery), yes, it will likely return.
Why does this code appear with other electrical codes?
This code can appear with electrical issues due to a failing battery or poor connections affecting multiple systems.
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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