The ACDelco GM Original Equipment Parking/Neutral Position and Backup Lamp Switch is a GM-recommended replacement for your vehicle's original component. It is mounted on the transmission and allows your vehicle to start only in the park or neutral position. It also serves as the switch for your vehicle's backup lamps, turning them on when the car is placed into reverse. This original equipment parking/neutral position and backup lamp switch has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.