An engine computer from a low mileage 2001 SILVERADO. Fine print or Auto Parts Only. Compatibility: Whenever a part number is supplied you must match the part number to yours.Just because your vehicle is listed does not mean this part will fit your vehicle. Car manufactures do vary design and function within the same production year. Are in working order, and tested before being offered for sale when possible. They may need additional cleaning. I always have tons of pictures to show condition.