Brake Control Module (BCM) Communication Loss
Lost communication with the brake 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 car's computer can't talk to the brake control module, which controls systems like ABS or traction control.
What the computer is actually seeing
The brake control module isn't responding to requests from the main control unit for status updates or inputs.
What a healthy reading looks like
Expected communication signals should be present on the CAN bus with voltages around 2.5V to 5V, usually pulsing at regular intervals depending on vehicle speed and braking input.
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.
- 1Inspect wiring and connectors to the brake control module for damage or corrosion. Repair as needed.
- 2Check the brake control module for proper function and possible fault codes using a scan tool. Note any additional codes present.
- 3If wiring and connectors are fine, swap the brake control module with a known good unit and retest communication. If communication is restored, replace the faulty module.
Common causes
- Faulty brake control module
- Damaged wiring to the brake control module
- Corroded or loose connector at the brake control module
- Issues with the CAN bus network
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive the vehicle, but be aware that ABS and traction control may not function correctly, which could affect stability.
Will this code come back after clearing?
If the underlying issue isn't resolved, yes, the code will return.
Why does this code show up with C0570?
C0570 often indicates a specific fault in communication, and both codes can point to similar wiring or module issues.
Working a real vehicle right now?
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