The knock sensor wire harness connects to the knock sensors on your engine and receives signals from both sensors. These signals taken from both knock sensor position in the ECU are sent through the wire harness so the vehicle's engine computer can properly monitor the engine and adjust ignition timing. Replace Your Faulty Knock Sensor Wire Harness Get rid of the fault codes & CEL (Check Engine Light) on your vehicle This knock sensor wiring harness is constructed from durable, high temperature wire to avoid melting, chaffing, and breaking. Factory style connectors allow the wire harness to be installed in a matter of minutes with NO cutting or splicing. Replaces Part Numbers: 12601822 917-033 317 033 Dorman 917033 Fits the Following Vehicles: 2004-2005 Buick Rainier, Cadillac CTS 2002-2005 Cadillac Escalade, Escalade EXT 2003-2005 Cadillac Escalade ESV 2005 Cadillac STS, Chevrolet SSR, GMC Envoy 2007 Chevrolet Avalanche 2002-2006 Chevrolet Avalanche 1500, 2500 2001-2002 Chevrolet C3500 HD 1999-2002 Chevrolet Camaro, Corvette 2003-2007 Chevrolet Express 1500, 2500, 3500 1999-2006 Chevrolet Silverado 1500 2007 Chevrolet Silverado 1500 Classic, 1500 HD Classic, 2500 HD Classic, 3500 Classic 2001-2006 Chevrolet Silverado 1500 HD, 3500 1999-2004 Chevrolet Silverado 2500 2001-2004 Chevrolet Silverado 2500 HD 2000-2005 Chevrolet Suburban 1500 2000-2007 Chevrolet Suburban 2500, Tahoe 2004-2005 Chevrolet Trailblazer, Trailblazer EXT 2001-2002 GMC C3500HD 2003-2005 GMC Envoy XL, Envoy XUV, Savana 1500 2003-2007 GMC Savana 2500, 3500 1999-2006 GMC Sierra 1500 2007 GMC Sierra 1500 Classic, 1500 HD Classic, 2500 HD Classic, 3500 Classic 2001-2006 GMC Sierra 1500 HD, 2500 HD, 3500 1999-2004 GMC Sierra 2500 2000-2007 GMC Yukon, XL 1500, XL 2500 2005-2007 Hummer H2 2003-2004 Isuzu Ascender 2004 Pontiac GTO 1999-2002 Pontiac Firebird 2005 Saab 9-7x