C0027moderate severityChassis
LR Wheel Speed Sensor Circuit Intermittent
on 2015 Cadillac ATS 2.5L I4 · RWD
What this code means
The left rear wheel speed sensor signal is intermittent.
Symptoms
- Intermittent ABS warning
- Rear ABS function inconsistent
- Stability control intermittent fault
Common causes
- Wiring damaged along rear axle
- Connector exposed to road spray
- Sensor loose in mounting boss
- Broken wire inside insulation
Diagnostic steps
- Monitor rear sensor signals during road test
- Inspect wiring along rear axle or trailing arm
- Check connector seals and pins
- Verify sensor retention
- Perform wiggle test
Repair notes
Repair damaged wiring. Replace connector seals. Re-secure sensor.
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
C0028
RR Wheel Speed Sensor Circuit Intermittent
C0035
Left Front Wheel Speed Sensor Circuit
C0036
Left Front Wheel Speed Signal Erratic
C0040
Right Front Wheel Speed Sensor Circuit