CAN Communication Fault (Body Control Module)
This code indicates a communication failure with the Body Control Module (BCM).
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 with other modules in the vehicle, which could affect things like lights and locks.
What the computer is actually seeing
The BCM fails to respond to CAN requests from other modules within a specified time frame (usually over 100 ms).
What a healthy reading looks like
BCM response expected within 100 ms; voltage on CAN bus should be around 2.5V to 3.5V while communicating.
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 CAN bus wiring and connectors for damage or loose connections. Fix any issues found. Decision: If repaired, clear codes and retest. If no issue, proceed to step 2.
- 22. Check for continuity on the CAN bus wires between the BCM and other modules. Expected: should be below 5 ohms. Decision: If there's an open circuit, repair wiring. If good, go to step 3.
- 33. Inspect for corrosion and ensure good grounding on the BCM. Clean connectors if necessary. Decision: If cleaned and grounding is good, clear codes and retest. If issue persists, continue to step 4.
- 44. Swap the Body Control Module with a known good unit. Decision: If the code clears, you need a new BCM. If it doesn't clear, there may be a deeper issue with the CAN network.
Common causes
- Damaged wiring or connectors for the CAN bus
- Faulty Body Control Module
- Corrosion or poor grounding
- Interference from aftermarket devices
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's driveable, but expect issues with lights, locks, and other accessories controlled by the BCM.
Will the code come back?
It can come back if the underlying issue isn't resolved, like wiring or module faults.
Why did this code pair with other codes?
Intermittent communication issues can affect multiple modules, causing related codes to trigger.
Working a real vehicle right now?
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