Body Control Module (BCM) Internal Fault
The Body Control Module has detected an internal malfunction.
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)
Inside the Body Control Module (BCM), a self-check found that something isn't working right with the internal circuits or software. This could be due to a bad connection, corrosion, or an internal failure of the module itself.
What the computer is actually seeing
The BCM checks various internal components and systems. When it detects an anomaly in its own operation, such as unexpected voltage levels or failed self-tests, it triggers a fault code for diagnostics.
What a healthy reading looks like
BCM internal circuit voltages are typically around 5V for logic levels and should pass self-checks during initialization without failures.
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. Inspect the wiring and connectors leading to the BCM for signs of damage, corrosion, or looseness. Fix any issues found.
- 22. Check the power and ground connections to the BCM. Ensure power supply is around 12V with the ignition on. Ground should be near 0V.
- 33. Perform a scan with a compatible diagnostic tool to check for any additional codes that may point to other related systems or faults.
- 44. If no other codes are present, attempt a reset of the BCM. If the code returns immediately, proceed to the next step.
- 55. Replace the Body Control Module if the code persists after resetting. Confirm through testing that the module is indeed faulty before replacing.
Common causes
- Faulty Body Control Module
- Wiring issues causing short circuits or open circuits
- Corrosion on connectors or pins
- Software corruption or updates needed
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive my vehicle with this code present?
It's generally safe to drive, but you may experience issues with lights, locks, or other electronics. Address soon.
Will this code come back after I clear it?
If the underlying issue isn't resolved, yes, it likely will.
Why does this code show up with other BCM codes?
The BCM controls multiple functions. If one part fails, it can lead to a chain reaction of 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.
Start guided diagnostic →