C0430moderate severityChassis
Lane Departure Warning System Fault
on 2021 Mazda Mazda3 2.5L I4 · FWD
What this code means
General malfunction in the lane departure warning or lane keeping assist system.
Symptoms
- LDW/LKA warning light
- Lane departure alerts not functioning
- Lane keeping assist not available
- Driver assist message on dash
Common causes
- Forward camera malfunction
- Camera calibration lost
- Windshield dirty in camera area
- Lane markings not detected
- EPS fault preventing lane keep steering
Diagnostic steps
- Clean windshield in camera area
- Check forward camera module codes
- Verify camera calibration
- Test on road with clear lane markings
- Check for EPS codes that disable LKA
Repair notes
Clean camera area. Recalibrate camera. Verify EPS is functional for lane keeping assist.
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