2008 GMC Sierra 3500 HD Service and Repair Manual

This factory service and repair manual for the 2008 GMC Sierra 3500 HD documents a one-ton truck whose engine bay held either a 403-cubic-inch 6.6L turbocharged diesel V8 or a 364-cubic-inch 6.0L gasoline V8, both overhead-valve. Body work spans five shapes — crew cab and extended cab pickups, a standard cab pickup, and cab and chassis units with two or four doors — while the model line stayed simple at three trims, SLE, SLT and WT. Procedures and specifications are organized by system across all of them.

Engines covered

• 6.6L V8 (403 cu in) — OHV, turbocharged, diesel
• 6.0L V8 (364 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 4-door crew cab pickup
• 4-door cab & chassis
• 2-door cab & chassis
• 4-door extended cab pickup
• 2-door standard cab pickup

Trims covered

• SLE
• SLT
• WT

Known issues on the 2008 Sierra 3500 HD. Two recalls are on the federal record, and both trace to the heated washer fluid system: a short circuit on the heater's circuit board that can bring odor, smoke and other faults, and a follow-up action for a heater module able to ignite outright. Owner complaints run to 471 for this year, dominated by air bags, with the electrical system and structure next. Wiring diagrams covering the washer heater circuit, restraint diagnostics and body procedures are the sections that answer those reports.