C1223 BUICK, CADILLAC, CHEVROLET, GMC, PONTIAC: LEFT REAR WHEEL SPEED SENSOR INPUT SIGNAL IS ZERO
POST UPDATED IN February, 2023
C1223 BUICK, CADILLAC, CHEVROLET, GMC, PONTIAC: LEFT REAR WHEEL SPEED SENSOR INPUT SIGNAL IS ZERO
The EBCM (Electronic Brake Control Module) sends an ignition signal to the wheel speed sensors. This kind of sensor tells the controller at what speed the corresponding wheel rotates through a square wave signal. To carry out its performance, each Wheel Speed Sensor has a reluctor ring. When this ring moves, it interrupts a magnetic field. With each interruption, some pulses are produced. These pulses are sent to the EBCM and the controller that needs them to calculate the speed at which the wheel is rotating.
The diagnostic code C1223 OBDII is set when the EBCM detects a malfunction in the Left Rear Wheel Speed Sensor. This condition is detected because there is no signal from the left rear wheel speed sensor or the signal is zero.
Reasons to store the C1223 OBD2 fault code C1223:
To troubleshoot DTC C1223 OBDII, try this: