CAN Communication Fault - Body Control Module
Indicates a communication issue 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 BCM can't talk properly with other computer modules in the vehicle, which can cause various electrical issues. This could be a wiring problem or the BCM itself is malfunctioning.
What the computer is actually seeing
The BCM isn't receiving or sending a signal within the expected range over the Controller Area Network (CAN) bus. It tries sending a data packet every 50 milliseconds but isn't receiving a response.
What a healthy reading looks like
The BCM should send/receive signals at around 2.5 volts for high and 0.5 volts for low. If these levels are out of range or missing, it triggers this fault 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.
- 1Check the battery voltage; should be 12.6 volts or higher. If below, recharge or replace the battery.
- 2Inspect the wiring and connectors related to the BCM for any visible damage or corrosion; repair as needed.
- 3Use a scan tool to check for other related codes in the system that may suggest further problems—if found, address them first.
- 4Check the specific voltage levels on the CAN bus wires with a multimeter while the vehicle is on; look for expected high (2.5V) and low (0.5V) signals.
- 5If all tests pass but the code persists, consider replacing the Body Control Module and rechecking connections.
Common causes
- Damaged wiring or connectors in the CAN bus system
- Faulty Body Control Module
- Corrosion at electrical connections
- Weak battery causing communication errors
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
Yes, but expect erratic electrical functions. It’s best to fix it soon to avoid bigger issues.
Will the code come back after clearing?
If the underlying issue isn’t resolved, it’s likely to return after clearing.
Why does this code appear with other codes?
Multiple codes can be related to a broader CAN communication issue affecting multiple modules.
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