Body Control Module - Hard Fault
A hard fault is detected in 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 (BCM) is like the vehicle’s brain for functions like lights and door locks. A hard fault means it’s having trouble communicating or is malfunctioning, which can affect those systems.
What the computer is actually seeing
The BCM is struggling to send or receive proper signals due to internal issues or corrupt data, leading to errors in controlling various body functions.
What a healthy reading looks like
BCM should maintain communication at less than 5 volts on the CAN network. If signals stay above that or are intermittent, there's a problem.
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.
- 1Check for blown fuses related to BCM. If any fuses are blown, replace and retest.
- 2Inspect connectors for corrosion or poor fit; clean and reconnect if necessary.
- 3Measure battery voltage; should be 12.6V or more. If below, charge or replace battery.
- 4Use a scan tool to check for additional codes related to the BCM. Address other codes first.
- 5If all other checks are good, consider replacing the BCM.
Common causes
- Faulty body control module
- Corroded connectors
- Wiring issues
- Battery voltage drop
- Faulty power supply to the BCM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but could affect comfort features like power windows or lighting; fix soon.
Will this fault come back after fixing?
If the root cause is repaired properly, this code shouldn't return.
Why does it sometimes pair with another code?
Multiple codes often indicate related issues, such as wiring problems 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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