The throttle body regulates the proper volume of airflow into the engine which is essential to the mixture of fuel and air in the engine. If you are experiencing engine stalling, failing to start, electronic throttle warning light came on, hesitation or power surging on acceleration on your Escalade, Express, SSR, Suburban, Yukon XL then you may have a problem with your vehicle's throttle body. Fits the following vehicles: 2005-2007 Rainer 5.3L 2007-2008 Escalade, ESV, EXT 2007-2008 Avalanche 2008 Express 1500 5.3L 2008 Express 2500, 3500 4.8L, 6.0L 2005-2006 SSR 2007-2008 Silverado 1500 4.8L, 5.3L, 6.0L 2007-2008 Silverado 2500 HD, 3500 HD 6.0L 2007-2008 Suburban 1500, 2500 2007-2008 Tahoe 2006-2008 Trailblazer 5.3L, 6.0L 2005-2006 Trailblazer EXT 5.3L 2005-2008 Envoy 5.3L 2005-2006 Envoy XL 5.3L 2005 Envoy XUV 5.3L 2008 Savana 1500 5.3L 2008 Savana 2500, 3500 4.8L, 6.0L 2007-2008 Sierra 1500 4.8L, 5.3L, 6.0L, 6.2L 2007-2008 Sierra 2500 HD, 3500 HD 6.0L 2007-2008 Yukon, Yukon XL 1500, XL 2500 2008 H2 2008 H3 5.3L 2005-2006 Ascender 5.3L 2005-2007 9-7x 5.3L 2008 9-7x 5.3L, 6.0L Replaces part numbers: 217-2422, 12679524, 12580760, 2172422 This is a compatible replacement part manufactured by AA Ignition. This throttle body is NOT a genuine OEM part. Vehicle makes and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this throttle body fits.