2022 GMC Sierra 3500 HD Service and Repair Manual

This factory service and repair manual for the 2022 GMC Sierra 3500 HD carries five trims: AT4, Denali, Pro, SLE and SLT. The truck is covered as a crew cab or extended cab pickup, as a standard cab pickup, and as a cab and chassis with four or two doors. Both engines are 6.6-liter overhead-valve V8s — the 403-cubic-inch turbocharged diesel and the 401-cubic-inch naturally aspirated gasoline or flex-fuel unit — and each has its own torque values, wiring diagrams and diagnostic procedures in this manual.

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

Trims covered

• AT4
• Denali
• Pro
• SLE
• SLT

Known issues on the 2022 Sierra 3500 HD. Three recalls reach this model year. The first involves the bolts holding the brake pressure modulator valve, which if under-tightened let water into the assembly and can short it into a fire. The second is a tailgate release switch that shorts after water intrusion and can unlatch the gate while the truck is moving. The third is a transmission control valve failure that locks the rear wheels. Thirty-one complaints spread across power train, the electrical system and tires, and the brake, transmission and body sections here cover that ground.