CAN Communication Fault - Motor Control Module
There's a communication issue between the motor control module and the vehicle's CAN bus.
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 vehicle's computer can't talk to the motor control module due to a glitch or faulty wiring in the communication line. It's like a dropped call on a phone between two important components.
What the computer is actually seeing
The computer sees a lack of data packets from the motor control module over the CAN network. Typically, it will be looking for a specific round-trip response time of under 100 milliseconds.
What a healthy reading looks like
A normal CAN message should show data transfer rates over 50 kbps, with response time under 100 milliseconds.
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. Check the vehicle's battery voltage. It should be between 12.2 to 12.8 volts when the vehicle is off.
- 22. Inspect the wiring and connectors on the motor control module and CAN bus for any obvious damage or corrosion.
- 33. Test continuity of the CAN bus wires between the motor control module and the main harness. Resistance should be less than 5 ohms.
- 44. Use a scan tool to check for other related codes that might indicate additional faults in the system.
- 55. If no visual issues are found, use a professional scanner to monitor the CAN communication live; check for response times. Replace the motor control module if it does not respond. If it responds but other codes are present, address those accordingly.
Common causes
- Damaged wiring or connectors in the CAN bus circuit
- Faulty motor control module
- Weak battery or poor ground connections
- Interference from aftermarket equipment
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but you may experience issues like traction control or ABS malfunctions.
Will this code come back after clearing it?
If the cause isn't fixed, yes, the code will likely return.
What could happen if I ignore this code?
You could lose functionality in motor control features, which might affect vehicle stability and safety.
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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