{"product_id":"ignition-lock-cylinder-switch-housing-for-chevy-silverado-gmc-sierra-03-to-07","title":"Ignition Lock Cylinder Switch Housing For Chevy Silverado GMC Sierra 03 To 07","description":"\u003cstrong\u003eThis Ignition Lock Cylinder Switch \u0026amp; Housing is a complete key cylinder and ignition switch assembly compatible with 2003-2007 Chevy Silverado and GMC Sierra models and matches OEM Part# US-578L.\u003c\/strong\u003e \u003ch2\u003eProduct Overview\u003c\/h2\u003e This ignition lock cylinder switch and housing assembly restores reliable vehicle starting and security for your Chevy Silverado or GMC Sierra. It combines the mechanical key tumbler with the integrated electrical switch that controls ignition, accessory, and start circuits in one ready-to-install unit. Designed for 2003-2007 model year trucks, this ignition lock cylinder switch and housing replaces a worn or failed original to eliminate no-start conditions, key sticking, and intermittent power loss without reprogramming. \u003ch3\u003eKey Features \u0026amp; Performance\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eComplete assembly includes lock cylinder, ignition switch, and housing — no separate component sourcing required\u003c\/li\u003e \u003cli\u003ePre-coded key tumbler matched to new keys for plug-and-play installation on most compatible models\u003c\/li\u003e \u003cli\u003eHeavy-duty electrical contacts resist pitting and carbon buildup that cause intermittent starting issues\u003c\/li\u003e \u003cli\u003eDie-cast metal housing with anti-tamper collar replicates factory security and mounting fit\u003c\/li\u003e \u003cli\u003ePrecision-machined cylinder bore reduces key binding and ensures smooth rotation through all ignition positions\u003c\/li\u003e \u003cli\u003eFactory-style connector plug mates directly with existing wiring harness without splicing or adapters\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eFitment \u0026amp; Compatibility\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e2003 Chevrolet Silverado 1500 \/ 2500 \/ 3500\u003c\/li\u003e \u003cli\u003e2004 Chevrolet Silverado 1500 \/ 2500 \/ 3500\u003c\/li\u003e \u003cli\u003e2005 Chevrolet Silverado 1500 \/ 2500 \/ 3500\u003c\/li\u003e \u003cli\u003e2006 Chevrolet Silverado 1500 \/ 2500 \/ 3500\u003c\/li\u003e \u003cli\u003e2007 Chevrolet Silverado 1500 \/ 2500 \/ 3500 (Classic Body)\u003c\/li\u003e \u003cli\u003e2003 GMC Sierra 1500 \/ 2500 \/ 3500\u003c\/li\u003e \u003cli\u003e2004 GMC Sierra 1500 \/ 2500 \/ 3500\u003c\/li\u003e \u003cli\u003e2005 GMC Sierra 1500 \/ 2500 \/ 3500\u003c\/li\u003e \u003cli\u003e2006 GMC Sierra 1500 \/ 2500 \/ 3500\u003c\/li\u003e \u003cli\u003e2007 GMC Sierra 1500 \/ 2500 \/ 3500 (Classic Body)\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eCommon Uses\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eReplacing an ignition lock cylinder with a broken or stuck key that won't turn\u003c\/li\u003e \u003cli\u003eFixing no-crank or intermittent start issues caused by a failed ignition switch\u003c\/li\u003e \u003cli\u003eRestoring full electrical accessory power when the switch contacts wear out\u003c\/li\u003e \u003cli\u003eAddressing security system lockouts linked to a damaged key tumbler or housing sensor\u003c\/li\u003e \u003cli\u003eFleet and work truck maintenance where same-key convenience is not required\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eTechnical Specifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number(s):\u003c\/strong\u003e US-578L\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIgnition Positions:\u003c\/strong\u003e Off, Accessory, On, Start\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHousing Material:\u003c\/strong\u003e Die-Cast Zinc Alloy with Steel Collar\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eConnector Type:\u003c\/strong\u003e Direct-Fit OEM-Style Plug\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eKeys Included:\u003c\/strong\u003e 2\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e \u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does this ignition lock cylinder and switch assembly come with new keys? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, this assembly includes two pre-cut keys matched to the cylinder, so it is ready to install and operate immediately on compatible models.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Will I need to reprogram my vehicle’s security system after installing this ignition switch housing? \u003cstrong\u003eA:\u003c\/strong\u003e On most 2003-2007 Silverado and Sierra trucks without advanced transponder systems, no reprogramming is required. If your vehicle uses a specific anti-theft key with a chip, a relearn procedure may be needed based on your serial number.\u003c\/p\u003e \u003cp\u003e\u003cem\u003eProduct appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.\u003c\/em\u003e\u003c\/p\u003e","brand":"DURAFORCE","offers":[{"title":"Default Title","offer_id":53679693725969,"sku":"ZZ3A01234","price":171.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0250\/2446\/2929\/files\/57_b27f975a-2c11-4d25-a2d2-9cd08b4948fd.jpg?v=1781653394","url":"https:\/\/www.duraforce.com\/products\/ignition-lock-cylinder-switch-housing-for-chevy-silverado-gmc-sierra-03-to-07","provider":"DURAFORCE","version":"1.0","type":"link"}