C1027 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C1027 – Left Rear Wheel Speed Sensor Signal Erratic Performance


C1027 Possible Symptoms


Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)


C1027 Possible Causes


Tire air pressure mismatch,Faulty Left Rear Wheel Speed Sensor,Left Rear Wheel Speed Sensor harness is open or shorted,Left Rear Wheel Speed Sensor circuit poor electrical connection,Faulty Anti-Lock Brake System (ABS) Module


C1027 Description


The Anti-Lock Brake System (ABS) Module monitors the Left Rear Wheel Speed Sensor. The ABS Module sets the OBDII code when the Left Rear Wheel Speed Sensor (WSS) Signal is intermittently missing while vehicle speed is above 25 mph (40 km/h) or erratic wheel speed signal during acceleration or sensed wheel speed is different from other wheels.