GM Genuine Parts Suspension Position Sensors are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These sensors measure the distance between your vehicle's chassis and body. These measurements help automatically adjust your vehicle's suspension so the headlamps are properly directed for optimum visibility. 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).