Control Module Fault
Fault detected in the control module's internal communication.
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 control module is not communicating properly either internally or with other parts of the system.
What the computer is actually seeing
The control module identifies a communication loss or internal error state that affects functions it manages.
What a healthy reading looks like
Expected communication stability with no internal error signals detected during self-checks.
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. Verify all power and ground connections to the control module; look for steady voltage (typically 12V) and good grounds.
- 22. Inspect wiring and connectors for damage or corrosion; repair as necessary.
- 33. Use a scan tool to check for additional codes; consider that related codes could indicate multiple faults.
- 44. Clear the fault codes and test drive the vehicle to see if the code returns; if it does, proceed to step 5.
- 55. Check for software updates or reprogramming for the control module; this can sometimes resolve internal faults.
- 66. If the issue persists, you may need to replace the control module and then re-test the system.
Common causes
- Failed control module
- Wiring harness issues
- Faulty connectors
- Corrosion in connectors or pins
- Software glitches
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderately; however, expect potential issues with the systems controlled by the affected module.
Will this issue come back after clearing the codes?
Yes, if the underlying cause isn't fixed, it will likely return.
What if I find another code related to this one?
Investigate all related codes; they often indicate interconnected issues that need to be resolved.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →