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
C0237 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 C0237 code
2001 GMC SIERRA ELECTRICAL SYSTEM
2002 GMC SIERRA ELECTRICAL SYSTEM
2003 GMC SIERRA ELECTRICAL SYSTEM
2004 GMC SIERRA ELECTRICAL SYSTEM
2000 GMC S PICKUP SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT
2000 GMC T PICKUP SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT
2000 GMC S PICKUP SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT
2000 GMC S SERIES SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT
2000 GMC T PICKUP SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT
2000 GMC T SERIES SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT