GM Genuine Part ABS Wheel Speed Sensors are designed, engineered, and tested to rigorous standards, and are backed by General Motors. The wheel speed sensors are located at each wheel, monitoring the rotation of each wheel. The sensor provides this speed information to the antilock brake control module for the antilock braking function. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).