Body Control Module (BCM) Communication Fault
Indicates a communication issue with the Body 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 Body Control Module isn't talking properly to other modules in the vehicle, which can affect things like door locks or lights.
What the computer is actually seeing
The BCM expects a signal from other modules every 50 milliseconds, and when it doesn't receive it or gets an error signal, it sets this code.
What a healthy reading looks like
BCM communication should show clear responses within 50 ms; if not, there's a fault.
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 all wiring and connectors leading to the BCM for damage or corrosion. Repair as needed. Decision Point: If damage is found, fix it and retest. If no damage is found, proceed to step 2.
- 22. Verify the integrity of the power and ground to the BCM. Power supply should read 12V-14V; ground should be less than 0.5 ohms to chassis ground. Decision Point: If voltage is outside expected range, investigate power supply issues. If voltage checks okay, move to step 3.
- 33. Use a scan tool to check for other communication codes or issues with other modules. If other modules show faults, troubleshoot those first. Decision Point: If other module codes are present, solve those issues. If only B1995 is present, continue to step 4.
- 44. Perform a BCM reset and recheck for codes. If B1995 returns, replace the BCM. Decision Point: If code comes back, consider BCM replacement.
Common causes
- Loose or damaged wiring harnesses connecting the BCM
- Faulty BCM itself
- Water ingress or corrosion in connectors
- Aftermarket modifications disrupting communication
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but you might lose functions like power locks or lights until repaired.
Will this code come back after resetting?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code pair with other codes?
If other modules are having communication errors, they can trigger this code as they rely on the BCM for signals.
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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