New 2026 GMC Sierra 2500HD Denali

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

• Reliability (4)
  4 out of 5 stars
  GM's heavy-duty trucks generally have a strong reputation for reliability, and the Sierra 2500HD is no exception. Owners report good longevity and durability, though long-term performance with heavy use will always be a factor.
• Maintenance (3)
  3 out of 5 stars
  As with any heavy-duty truck, maintenance costs can be higher than for a light-duty vehicle. Routine oil changes for the diesel engine are more involved, and parts for larger components can be more expensive, but the overall frequency is usually reasonable for its class.
• Technology (4)
  4 out of 5 stars
  GMC equips the Denali with a generous suite of technology, including a large infotainment touchscreen, Apple CarPlay/Android Auto, and a comprehensive driver-assistance package. The ProGrade Trailering System is particularly impressive for its functionality.
• Comfort (4)
  4 out of 5 stars
  The Denali trim elevates comfort significantly with premium leather seating, heated and ventilated front seats, and a quiet cabin. Road and engine noise are well-managed, making long drives more pleasant than typical heavy-duty trucks.
• Dynamics (4)
  4 out of 5 stars
  The Sierra 2500HD Denali offers a robust and capable powertrain, especially with the Duramax diesel, providing excellent towing and hauling power. The ride, while firm as expected for an HD truck, is surprisingly well-controlled and stable.

• Seating:

  • Seating Rows:2
  • Standard Seating:5
  • Max Seating:5
  • Leg Room (front):44.5in.
  • Leg Room (rear):43.4in.

• Measurements:

  • Width:81.9in.

• Wheels & Tires:

  • Tire:LT275/65R20

• Performance:

  • Towing Capacity:16,000lbs
  • Max Towing Capacity:16,000lbs

• Fuel Tank:

  • Fuel Tank Volume:35.9gallon