Chassis Control Module (CCM) Communication Fault
CCM is having trouble communicating 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 chassis control module isn't able to talk to the body control module, which means some functions like windows or locks may not work right.
What the computer is actually seeing
The Chassis Control Module (CCM) reports no response from the Body Control Module (BCM) on the CAN bus within a specified period, typically around 10 milliseconds.
What a healthy reading looks like
Expected communication signals on the CAN bus should range from 2.5V to 3.5V for the data lines during active communication.
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 wiring and connectors between CCM and BCM for physical damage or corrosion. Repair if needed.
- 2Measure voltage on CAN bus lines; you should see between 2.5V and 3.5V. If not, further investigate the CAN bus.
- 3Ensure battery voltage is above 12.5V and check for blown fuses related to CCM and BCM.
- 4Swap BCM with a known good unit to test if the fault is with the BCM; if code clears, replace BCM.
- 5If the issue remains, swap the CCM with a known good unit; if code clears, replace CCM.
Common causes
- Damaged wiring or connections between CCM and BCM
- Faulty Body Control Module (BCM)
- Failed Chassis Control Module (CCM)
- Issues with the CAN bus network
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but functions like power windows and locks may not operate properly. Monitor vehicle functions until repairs are made.
Will this code come back?
If the underlying issue isn't fixed, it will likely return after clearing the code.
Why does this code pair with other communication issues?
These codes often share wiring or bus issues; eliminating one problem may resolve others.
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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