Possible causes
– Faulty Rear Speed Sensor
– Rear Speed Sensor harness is open or shorted
– Rear Speed Sensor circuit poor electrical connection
– Faulty EBCM
– Rear Speed Sensor harness is open or shorted
– Rear Speed Sensor circuit poor electrical connection
– Faulty EBCM
Symptoms
– ABS Warning Light ON
C0236 GMC Description
As the wheel spins, the wheel speed sensor produces an Alternating Current (AC) signal. The Electronic Brake Control Module (EBCM) uses the frequency of the AC signal to calculate the wheel speed.
GMC Technical Service Bulletins for C0236 code
1998 GMC SAFARI SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT
1998 GMC SAFARI SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT
1998 GMC SAVANA SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT
1999 GMC SAFARI SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT
1999 GMC SAFARI SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT
1999 GMC SAVANA SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT
2000 GMC SAFARI SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT
2000 GMC SAFARI SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT
2000 GMC SAVANA SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT
2001 GMC SAFARI SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT