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An ACDelco GM Original Equipment Ignition Coil is a GM-recommended replacement for your vehicle’s original component, and undergoes more stringent testing than aftermarket products. It increases electrical system voltage to help ignite the air/fuel mixture as the starting and charging system starts the engine, maintains the battery's charge, and provides power to the electrical accessories while the engine is running. An ACDelco GM OE Ignition Coil uses pure copper windings to improve durability and provide higher resistance to internal shorts and dielectric breakdown. Because the number and shape of the laminations determine the output characteristics of an ignition coil, ACDelco ensures that the silicone steel plates surrounding the coil correctly match the original part size and number. Since steel laminations work best when they are new, shiny, and clean, ACDelco laminations are coated to hinder corrosion and many feature molded plastic protection to help ensure that nothing is exposed. This original equipment ignition coil has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors. Popular Fitments: 2008 Buick Allure,LaCrosse, 2005-2007 Buick Rainier 4.2L 5.3L Popular Fitments: 2011-2014 Cadillac Escalade,Escalade ESV, 2011-2013 Cadillac Escalade EXT, 2009-2013 Cadillac Escalade, 2007-2010 Cadillac Escalade,Escalade ESV,Escalade EXT, 2006-2007 Cadillac CTS V6 V8 Popular Fitments: 2014-2016 Chevrolet SS, 2012-2016 Chevrolet Caprice, 2008-2016 Chevrolet Express 2500,Express 3500, 2008-2016 Chevrolet Express 2500,Express 3500,Silverado 2500 HD 6.0L 6.6L, 2007-2016 Chevrolet Silverado 3500 HD 6.0L 6.6L Popular Fitments: 2008-2016 GMC Savana 2500,Savana 3500, 2008-2016 GMC Savana 2500,Savana 3500,Sierra 2500 HD 6.0L 6.6L, 2007-2016 GMC Sierra 3500 HD 6.0L 6.6L, 2008-2014 GMC Savana 1500 V6 V8, 2007-2014 GMC Yukon,Yukon XL 1500 5.3L 6.2L Popular Fitments: 2009-2010 Hummer H3T 3.7L 5.3L, 2008-2010 Hummer H3 V8, 2008 Hummer H2 Popular Fitments: 2005-2006 Isuzu Ascender 4.2L 5.3L Popular Fitments: 2009 Pontiac G8, 2005-2008 Pontiac Grand Prix V6 V8, 2005-2006 Pontiac GTO