An ACDelco GM Original Equipment Idle Speed Control Power Steering Pressure Switch is a GM-recommended replacement for your vehicle's original component. It senses hydraulic pressure in the power steering system. When pressure is high, such as when turning the steering wheel at a standstill, the switch closes. This signals your vehicle's engine control module to increase idle speed and maintain idle quality. This original equipment idle speed control power steering pressure switch has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.