C0525moderate severityChassis
Front Differential Lock Actuator Circuit
on 1998 Mazda B2500 2.5L I4 · FWD
What this code means
Malfunction in the front differential lock actuator used in part-time 4WD systems.
Symptoms
- 4WD light flashing
- Front axle not engaging
- Grinding during engagement
- Service 4WD message
Common causes
- Lock actuator motor failure
- Actuator shift fork worn
- Wiring damage
- Differential synchronizer ring worn
Diagnostic steps
- Command actuator engagement with scan tool
- Listen for actuator operation
- Check actuator wiring
- Inspect actuator for physical damage
- Test actuator motor
Repair notes
Replace front differential actuator. Check synchronizer condition.
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C0021
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C0022
RF Wheel Speed Sensor Range/Performance
C0023
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C0024
RR Wheel Speed Sensor Range/Performance
C0025
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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
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