C0236 GMC Code - Missing Rear Speed Sensor Signal

C0236 indicates that the vehicle's control module has detected a missing or irregular signal from the rear wheel speed sensor.

Common symptoms include an illuminated ABS or traction control light, reduced braking performance, and possible activation of fail-safe or limp mode.

Possible causes include a faulty rear wheel speed sensor, damaged wiring or connectors, a malfunctioning ABS module, or debris obstructing the sensor.

While the vehicle may still be drivable, it is not recommended as safety features like ABS and traction control may be compromised.

Start by inspecting the rear wheel speed sensor and its wiring for damage or corrosion. Use a scan tool to monitor sensor readings and confirm the fault.

Repairs may include replacing the rear wheel speed sensor, repairing damaged wiring, cleaning the sensor and tone ring, or replacing the ABS module if necessary.

Repair costs vary, but replacing a wheel speed sensor typically costs $100-$300, including parts and labor. Wiring repairs or ABS module replacement can cost more.

Yes, dirt, debris, or rust on the tone ring can interfere with the speed sensor signal and trigger the C0236 code.

Resetting the code may temporarily clear the warning, but the underlying issue must be addressed to prevent the code from returning.

Regularly inspect and clean wheel speed sensors and tone rings, avoid driving through deep water or mud, and address any ABS-related warnings promptly.