Battery Voltage High - Battery Control Module (BCM)
High voltage detected by the Battery Control Module.
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 Battery Control Module is seeing more voltage than it should, which can be due to a faulty battery or the charging system overcharging.
What the computer is actually seeing
The BCM monitors battery voltage and expects a normal range of 12.6V to 14.4V while running. If it sees voltages over 15.0V, it triggers this code.
What a healthy reading looks like
Battery voltage should be between 12.6V (off) and 14.4V (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. Is it over 15.0V? If yes, proceed to step 2. If no, check BCM operation for faults.
- 22. Inspect the alternator. Is it outputting over 14.4V when running? If yes, replace or repair the alternator. If no, continue to step 3.
- 33. Examine battery condition. Is the battery swollen or leaking? If yes, replace the battery. If no, inspect wiring and connectors for corrosion or damage.
- 44. Check for voltage drops across connections. Use the multimeter to check for significant resistance in wiring (more than 0.1 ohms is suspect). If found, repair or replace wiring.
Common causes
- Faulty battery
- Overcharging by the alternator
- Bad wiring or connectors
- Faulty Battery Control Module (BCM)
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Can I drive with this code?
Yes, but be cautious. If the voltage is truly high, it can damage electronics over time.
Will this code come back after clearing?
If the underlying issue isn't fixed, and the voltage spikes again, it will come back.
Why would this pair with other battery codes?
Often, overvoltage issues will trigger multiple codes related to battery performance and the charging system.
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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