GM Genuine Parts Acceleration Sensors are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These acceleration sensors measure the vibration, or acceleration of motion, of your vehicle. These measurements are calculated from varied force placed upon a spring within the sensor and data is then sent to your vehicle's electronic control unit (ECU). 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).