GM# 12612397, AC Delco # 216-140 , Engine Control Module. New, bought and never used. Programming is required in order to be used. No warranty available as a private sale.
AI Overview-
GM part #12612397 is an engine control module (ECM) used in various vehicles across the General Motors lineup, including Chevrolet, Buick, GMC, Pontiac, and Saturn models, primarily from 2007 to 2012. The ECU is compatible with specific engines and years for each model listed. 
Buick:
Lucerne: 2009–2011, with 3.9L V6 engines. 
Chevrolet:
Cobalt: 2007–2010, with 2.2L or 2.4L engines.Express 1500: 2008–2009, with 4.3L V6 engines.HHR: 2007–2011, with 2.2L or 2.4L engines.Impala: 2010–2011, with 3.5L or 3.9L V6 engines.Malibu: 2007–2012, with 2.2L, 2.4L, or 3.5L engines.Silverado 1500: 2007–2009, with 4.3L V6 engines. GMCSavana 1500: 2008–2009, with 4.3L V6 engines.Sierra 1500: 2007–2009, with 4.3L V6 engines. 
Pontiac;
G5: 2007–2009, with 2.2L or 2.4L engines.G6: 2008–2010, with 2.4L, 3.5L, or 3.9L engines.Solstice: 2008–2010, with 2.4L engines. 
Saturn:
Aura: 2008–2009, with 2.4L engines.Sky: 2008–2010, with 2.4L engines.Vue: 2008–2010, with 2.4L engines. 
Important considerations:This ECU almost always requires programming with the correct Vehicle Identification Number (VIN) to function in a new vehicle.Some models may use different ECMs depending on the trim and engine configuration, even within the same model year. Always verify compatibility with your specific vehicle's engine and existing part number.