The 2008 Chevrolet HHR Engine Computer ECM PCM ECU OEM 12618031 is a car part made of aluminum with a bolt-on mounting style. It is an Engine Control Module (ECM) that requires programming and has a pin terminal type. This part is specifically designed for the front placement on the vehicle and is a genuine Chevrolet product manufactured in the United States. It is an easy-to-install part that is compatible with various interchange part numbers and features a supply voltage and ground input connection.