Body Control Module (BCM) High Voltage Circuit
The BCM has detected a high voltage condition in its 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 (BCM) is seeing voltage levels that are too high, which could cause it to malfunction or damage other components.
What the computer is actually seeing
The BCM is reading a voltage signal greater than its operating range, typically above 16 volts, when it should be around 12 to 14 volts in normal operation.
What a healthy reading looks like
Normal voltage at the BCM should be between 12V and 14V; anything above 15V can trigger this code.
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 the battery voltage with a multimeter. It should read between 12.0V and 14.0V. If higher, check the alternator.
- 22. Inspect wiring and connectors between the battery, alternator, and the BCM. Look for damage, corrosion, or loose connections.
- 33. With the vehicle running, check the alternator output voltage; it should not exceed 14.5V under load.
- 44. If the voltages are within range, test the BCM for faults using a professional scan tool. Look for software updates or known issues.
- 55. If a high voltage issue persists, consider replacing the alternator or the BCM based on test results.
Common causes
- Faulty alternator overcharging
- Short circuit in wiring harness
- Corroded connectors
- Faulty BCM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It depends on the voltage levels; if it exceeds 15V, it may not be safe. Get it checked soon.
Will this code come back after clearing?
If the underlying issue isn't fixed, it will likely return shortly after clearing.
Why does this code sometimes pair with other codes?
Other codes may indicate faults in related systems like the charging system, which can also contribute to high voltage levels.
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