C0411moderate severityChassis
ACC Radar Module Communication Fault
on 2011 Lincoln MKX 3.7L V6 · AWD
What this code means
Loss of CAN bus communication with the ACC radar module.
Symptoms
- ACC disabled
- Multiple driver assist warnings
- Forward collision alert unavailable
Common causes
- CAN wiring fault to radar module
- Module connector disconnected
- Radar module power loss
- CAN bus termination issue at module
Diagnostic steps
- Check CAN communication to radar module
- Inspect module connector
- Verify power and ground at module
- Check CAN bus wiring continuity
- Look for U-codes related to radar module
Repair notes
Repair CAN bus wiring or connector. Replace module if communication chip has failed.
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