C0411moderate severityChassis
ACC Radar Module Communication Fault
on 2017 Mazda Mazda3 2.0L I4 · FWD
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.
Other Chassis codes on this vehicle
C0021
LF Wheel Speed Sensor Range/Performance
C0022
RF Wheel Speed Sensor Range/Performance
C0023
LR Wheel Speed Sensor Range/Performance
C0024
RR Wheel Speed Sensor Range/Performance
C0025
LF Wheel Speed Sensor Circuit Intermittent
C0026
RF Wheel Speed Sensor Circuit Intermittent
C0027
LR Wheel Speed Sensor Circuit Intermittent
C0028
RR Wheel Speed Sensor Circuit Intermittent
C0035
Left Front Wheel Speed Sensor Circuit
C0036
Left Front Wheel Speed Signal Erratic