C1227 Code: Meaning, Causes, and Symptoms | OBD2 Codes
C1227 – Left Rear Excessive Wheel Speed Variation
C1227 Possible Symptoms
Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)
C1227 Possible Causes
Faulty Hub Assembly (Left Rear Wheel Speed Sensor is part of hub assembly),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
As the wheel spins, the wheel speed sensor produces an AC signal. The Electronic Brake Control Module (EBCM) uses the frequency of the AC signal to calculate the wheel speed. The EBCM will set the OBDII code when the sensor is not to factory specifications.