2024 GMC Sierra 2500 HD Service and Repair Manual

This factory service and repair manual for the 2024 GMC Sierra 2500 HD covers the broadest range in the run, seven trims in all: AT4, AT4X, Denali, Denali Ultimate, Pro, SLE and SLT, on a 4-door crew cab pickup, a 4-door extended cab pickup or a 2-door standard cab pickup. Three entries appear on its engine list, the 6.6L turbocharged diesel V8 of 403 cubic inches, the 6.6L gasoline or flex-fuel V8 of 401 cubic inches, and one that the record leaves unnamed. Procedures, specifications, torque values, wiring diagrams and diagnostics are set out per system.

Engines covered

• 6.6L V8 (403 cu in) — OHV, turbocharged, diesel
• 6.6L V8 (401 cu in) — OHV, naturally aspirated, gasoline or flex-fuel

Body styles covered

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

Trims covered

• AT4
• AT4X
• Denali
• Denali Ultimate
• Pro
• SLE
• SLT

Known issues on the 2024 Sierra 2500 HD. A single owner complaint is logged with NHTSA on this model year, and it concerns the engine. That is the part of the truck this manual treats at the greatest length, with separate coverage for the turbocharged diesel V8 and the gasoline and flex-fuel V8: fuel delivery, air intake and charging, cooling, lubrication, control modules and the sensors that feed them, each with its own specifications, torque values, wiring diagrams and diagnostic routines. The chassis, brake, steering and body sections behind them are organized the same way, by system rather than by trim.