New 2026 GMC Sierra 3500HD Denali

* Based on opinions and should be considered as general guidance only.

• Reliability (4)
  4 out of 5 stars
  GMC trucks generally have a strong reputation for reliability, and the Sierra HD line is no exception. Long-term durability is a hallmark, though some complex electronic systems can occasionally present minor glitches.
• Maintenance (3)
  3 out of 5 stars
  As expected with a heavy-duty truck, maintenance can be more expensive and involved than a standard pickup. Larger components and specialized fluids contribute to higher costs, though routine maintenance intervals are reasonable.
• Technology (4)
  4 out of 5 stars
  Features a comprehensive infotainment system with a large touchscreen, Apple CarPlay/Android Auto, and a host of advanced driver-assistance systems. Some of the interface elements could be more intuitive, and the trailer camera system is impressive but takes time to master.
• Comfort (5)
  5 out of 5 stars
  The Denali trim elevates the Sierra 3500HD to near-luxury levels. Seats are supremely comfortable, the cabin is remarkably quiet, and materials are high-quality, making long hauls effortless.
• Dynamics (4)
  4 out of 5 stars
  The Sierra 3500HD Denali offers immense power and towing capability, but the sheer size can make maneuvering in tight spaces a challenge. Ride quality is surprisingly good when unladen, but can get a bit rough when empty compared to some rivals.