GMC Sierra 2500HD Road Test

Model Year Summary
The Sierra HD and its twin, the Chevrolet Silverado HD, are designed for heavy towing and hauling. The 6.0-liter V8 and 6.6-liter turbodiesel are both mated to a six-speed automatic. The latter employs a heavy-duty transmission made by Allison. A natural gas version of the 6.0-liter V8 is also available. The optional off-road suspension package makes the ride stiffer. Other options include a snow-plow preparation kit and a frame-mounted hitch for fifth-wheel towing. The cab offers a lot of storage space and can easily serve as a mobile office. The top-trim Denali has a luxurious interior. Android Auto and Apple CarPlay capabilities are now part of the easy-to-use infotainment system.


All cars come with basic warranty coverage, also known as a bumper-to-bumper warranty. This protects consumers against unexpected problems with non-wear items. Powertrain warranty protects against engine and transmission troubles. Rust through, or corrosion warranty, covers rust to non-damaged components. Roadside aid provides on-location assistance in case of a breakdown and may include limited towing services.

Extended warranties provide peace of mind. Owners of models known to have worse-than-average predicted reliability can mitigate risks with an extended warranty. Generally, we recommend buying a model with better-than-average reliability and skipping this expensive add on. If you do buy an extended warranty, it is key to read the small print to understand what is covered and where you can bring the car for repairs.

Basic (years/miles)

Powertrain (years/miles)

Rust through (years/miles)

Roadside aid (years/miles)