{"product_id":"2025-gmc-sierra-3500-hd-service-repair-manual","title":"2025 GMC Sierra 3500 HD Service and Repair Manual","description":"\u003cp\u003eBuilt for the heaviest towing in GMC's pickup range, the 2025 Sierra 3500 HD comes in Pro, SLE, SLT, AT4, Denali and Denali Ultimate trims, with single or dual rear wheels and cab-and-chassis versions for upfitters. Power comes from a 6.6L gasoline V8, flex-fuel capable, or the 6.6L Duramax turbodiesel V8, both driving through an Allison ten-speed automatic, with the Denali Ultimate diesel-only. Axle ratings, brakes and suspension vary with configuration, so this service and repair manual lays out procedures, specifications, torque values, wiring diagrams, diagnostics and maintenance schedules for each engine and chassis.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEngines covered\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e6.6L V8 — OHV, naturally aspirated, gasoline\u003c\/li\u003e\n\u003cli\u003e6.6L V8 — OHV, naturally aspirated, flex-fuel\u003c\/li\u003e\n\u003cli\u003e6.6L V8 — OHV, turbocharged, diesel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eBody styles covered\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e4-door crew cab pickup\u003c\/li\u003e\n\u003cli\u003e2-door cab \u0026amp; chassis\u003c\/li\u003e\n\u003cli\u003e4-door cab \u0026amp; chassis\u003c\/li\u003e\n\u003cli\u003e4-door extended cab pickup\u003c\/li\u003e\n\u003cli\u003e2-door standard cab pickup\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTrims covered\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAT4\u003c\/li\u003e\n\u003cli\u003eDenali\u003c\/li\u003e\n\u003cli\u003eDenali Ultimate\u003c\/li\u003e\n\u003cli\u003ePro\u003c\/li\u003e\n\u003cli\u003eSLE\u003c\/li\u003e\n\u003cli\u003eSLT\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eKnown issues on the 2025 Sierra 3500 HD.\u003c\/strong\u003e One recall is on federal record: on gasoline models with dual fuel tanks, the rear fuel pump may fail to move enough fuel to the front tank, and the engine can stall as a result. No owner complaints are recorded. The fuel delivery section of this manual gives the pump, transfer and diagnostic procedures along with wiring diagrams for the pump control module.\u003c\/p\u003e","brand":"FactoryManual","offers":[{"title":"Default Title","offer_id":49115160674526,"sku":"GMCSIERRA3500HD2025SRM","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0774\/4113\/8910\/files\/2025-gmc-sierra-3500-hd-service-repair-manual.png?v=1790458514","url":"https:\/\/factorymanual.com\/products\/2025-gmc-sierra-3500-hd-service-repair-manual","provider":"FactoryManual","version":"1.0","type":"link"}