C0025moderate severityChassis
LF Wheel Speed Sensor Circuit Intermittent
on 2002 GMC Envoy 4.2L I6 · 4WD
What this code means
The left front wheel speed sensor signal drops out intermittently during driving.
Symptoms
- ABS light on intermittently
- Sporadic traction control activation
- ABS works sometimes but not always
Common causes
- Damaged wiring at flex point near suspension
- Corroded connector pins
- Intermittent sensor internal fault
- Loose sensor mounting
Diagnostic steps
- Wiggle-test wiring harness while monitoring sensor signal
- Inspect connector for corrosion or backed-out pins
- Check sensor mounting bolt torque
- Road test while monitoring live data
- Inspect wiring routing near suspension components
Repair notes
Repair wiring at chafe point or replace connector. Re-secure sensor.
Other Chassis codes on this vehicle
C0021
LF Wheel Speed Sensor Range/Performance
C0021
LF Wheel Speed Sensor Range/Performance
C0022
RF Wheel Speed Sensor Range/Performance
C0022
RF Wheel Speed Sensor Range/Performance
C0023
LR Wheel Speed Sensor Range/Performance
C0023
LR Wheel Speed Sensor Range/Performance
C0024
RR Wheel Speed Sensor Range/Performance
C0024
RR Wheel Speed Sensor Range/Performance
C0026
RF Wheel Speed Sensor Circuit Intermittent
C0026
RF Wheel Speed Sensor Circuit Intermittent