2005 GMC C6500 Topkick Service and Repair Manual

This factory service and repair manual for the 2005 GMC C6500 Topkick spans three trim codes and three body configurations: a cab and chassis cutaway, a 2-door conventional cab and chassis and a crew cab and chassis. Under the hood sits one of three engines — the turbocharged 7.2L inline-six diesel at 441 cubic inches, the naturally aspirated 8.1L overhead-valve gasoline V8 at 496 cubic inches, or the turbocharged 7.8L inline-six diesel at 475 cubic inches. Specifications, procedures, torque values, wiring diagrams and diagnostics follow by system.

Engines covered

• 7.2L inline-six (441 cu in) — turbocharged, diesel
• 8.1L V8 (496 cu in) — OHV, naturally aspirated, gasoline
• 7.8L inline-six (475 cu in) — turbocharged, diesel

Body styles covered

• Cab & chassis, cutaway
• 2-door cab & chassis, conventional
• Cab & chassis, crew cab

Trims covered

• C6C042
• C6E042
• C6V042

Known issues on the 2005 C6500 Topkick. The truck was sold in three configurations with three engines, and the manual gets used to keep it in service. Engine specifications and procedures are given for both turbocharged diesel sixes and for the gasoline V8, with torque values, wiring diagrams and diagnostics for the chassis they share.