An ACDelco GM Original Equipment Used Engine Control Module is the high quality replacement ideal for your GM vehicle. It regulates various parts of your vehicle s engine by recording input from sensors and other modules and referencing that information back to additional sensors modules and other areas of the vehicle. Refurbishing GM Original Equipment Engine Control Modules involves returning the failed part to a factory certified repair facility for cleaning inspection and diagnosis. Any faulty components are identified and replaced when necessary and the repaired unit is tested again to ensure it functions to ACDelco specifications. In addition refurbishing also benefits the environment by returning components back into service rather than processing as scrap or simply disposing of them.