C0040

Possible causes
- Faulty Left Front Wheel Speed Sensor
- Left Front Wheel Speed Sensor harness is open or shorted
- Left Front Wheel Speed Sensor circuit poor electrical connection

 
Possible symptoms
- Antilock Brake System (ABS) warning light ON

C0040 Chevrolet Description

The wheel speed sensor (WSS) receives ignition voltage from the Electronic Brake Control Module (EBCM) and provides a DC square wave signal back to the module. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed.