2021 Chevrolet Silverado 6500 HD Service and Repair Manual
This factory service and repair manual for the 2021 Chevrolet Silverado 6500 HD has a narrow subject and a heavy one. Narrow, because a single turbocharged 6.6L OHV V8 of 403 cubic inches on diesel powers every truck, and a single Base specification covers both the four-door crew cab and chassis and the conventional cab and chassis. Heavy, because a chassis in this class needs published figures for its brake hydraulics, driveline and electrical system, and those figures sit here alongside the procedures and diagnostics that use them.
Engines covered
- 6.6L V8 (403 cu in) — OHV, turbocharged, diesel
Body styles covered
- 4-door cab & chassis, crew cab
- Cab & chassis, conventional
Trims covered
- Base
Known issues on the 2021 Silverado 6500 HD. One recall sits on the federal record. Brake fluid can seep past the pressure sensor assembly and into the brake pressure switch, where it shorts the circuit; the short can overheat the wiring and start a fire whether the truck is moving or parked. Owner complaints number two, one on the service brakes and one on exterior lighting. Both the sensor circuit and the lighting circuits are traced in the wiring diagrams here, and the hydraulic brake section carries the fluid, bleeding and pressure specifications behind them.
