A review of the 2025 GMC Sierra HD is available, including its specs, pricing, and warranty. Other vehicles, including the GMC Sierra 1500, GMC Sierra EV, GMC Hummer EV, GMC Canyon, and GMC Yukon, as well as the Ram HD and 2026 Chevrolet Silverado HD, are also being reviewed. The model year of the GMC Sierra HD being reviewed is uncertain, with some outlets referencing 2025 and another referencing 2026.