2025 GMC Sierra 2500HD Denali Ultimate
Unverified
All photo credits
- Photo: 2020 GMC Sierra 2500 Denali HD, Duramax 6.6L, front 2.1.20 by Kevauto, CC BY-SA 4.0, via Wikimedia Commons
- Photo: 2023 GMC Sierra 2500 Denali HD Ultimate in Titanium Rush Metallic, front right by Ethan Llamas, CC BY-SA 4.0, via Wikimedia Commons
- Photo: 2020 GMC Sierra 2500 Denali HD, Duramax 6.6L, rear 2.1.20 by Kevauto, CC BY-SA 4.0, via Wikimedia Commons
- Photo: 2023 GMC Sierra 2500 Denali HD Ultimate in Titanium Rush Metallic, rear left by Ethan Llamas, CC BY-SA 4.0, via Wikimedia Commons
The 2025 GMC Sierra 2500HD Denali Ultimate is a 401-hp 6.6-liter with an allison 10l1000 10-speed automatic and four-wheel drive. It starts at $93,300 MSRP.
It makes 401 horsepower and 464 lb-ft of torque.
The Sierra 2500HD measures 250.8 inches long on a 158.9-inch wheelbase and has a curb weight of 7,006 lb.
| Spec | Value |
|---|---|
| Vehicle | |
| Body Type | Pickup |
| Powertrain | Gas |
| Price | |
| MSRP | $93,300 |
| MSRP with Destination | $95,495 |
| Destination Charge | $2,195 |
| Engine | |
| Engine Type | 6.6L V-8 Gasoline (FlexFuel) |
| Displacement | 6.6 L |
| Horsepower | 401 hp |
| Torque | 464 lb-ft |
| Valvetrain | OHV, 2 valves/cyl, VVT (gas) |
| Bore and Stroke | 103.25 x 98 (gas) |
| Compression Ratio | 10.8:1 (gas) |
| Injection Type | Direct fuel injection (gas) |
| Drivetrain | |
| Drive Type | 4WD |
| Transmission | |
| Transmission | Allison 10L1000 10-speed automatic |
| 1st Gear | 4.54 |
| 2nd Gear | 2.87 |
| 3rd Gear | 2.06 |
| 4th Gear | 1.72 |
| 5th Gear | 1.48 |
| 6th Gear | 1.26 |
| 7th Gear | 1 |
| 8th Gear | 0.85 |
| 9th Gear | 0.69 |
| 10th Gear | 0.63 |
| Reverse | 4.54 |
| Final Drive | 3.73 |
| Fuel Economy | |
| Recommended Fuel | Regular gasoline |
| Suspension | |
| Front Suspension | Short/long-arm independent front suspension with torsion bars |
| Rear Suspension | Semi-elliptic two-stage multi-leaf springs (three-stage with available Max Towing Package) |
| Brakes | |
| Front Brake Disc | 14 x 1.6 in / 355 x 40 mm |
| Rear Brake Disc | 14.1 x 1.3 in / 360 x 34 mm |
| Tires & Wheels | |
| Tires Front | LT245/75R17E – LT265/60R22E (varies by config) |
| Tires Rear | LT245/75R17E – LT265/60R22E (varies by config) |
| Dimensions & Weight | |
| Length | 250.75 in |
| Width | 81.85 in |
| Height | 79.82 in |
| Wheelbase | 158.94 in |
| Front Track | 68.1 in |
| Rear Track | 68.3 in |
| Ground Clearance | 10.28 in |
| Curb Weight | 7,006 lbs |
| Interior | |
| Headroom Front | 43.03 in |
| Headroom Rear | 40.12 in |
| Legroom Front | 44.53 in |
| Legroom Rear | 43.4 in |
| Shoulder Room Front | 66.02 in |
| Shoulder Room Rear | 65.3 in |
| Hip Room Front | 61.18 in |
| Hip Room Rear | 60.24 in |
Similar cars
Rivals to the 2025 GMC Sierra 2500HD Denali Ultimate with similar size, power and price from around the same years.
Safety & Recalls
NCAP safety ratings
| Overall | Not rated |
| Frontal crash | ★★★★★ |
| Side crash | ★★★★★ |
| Rollover | Not rated |
Other tested variants (5)
- 2025 GMC Sierra 2500 PU/EC 4WD: overall not rated
- 2025 GMC Sierra 2500 PU/RC 4WD: overall not rated
- 2025 GMC Sierra 2500 PU/CC RWD: overall not rated
- 2025 GMC Sierra 2500 PU/EC RWD: overall not rated
- 2025 GMC Sierra 2500 PU/RC RWD: overall not rated
Recalls
1 recall on file with NHTSA for the 2025 GMC SIERRA 2500. Not every recall applies to every trim or VIN — check yours at nhtsa.gov/recalls.
Aug 13, 2026 · TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS
General Motors, LLC (GM) is recalling certain 2024-2025 Chevrolet Silverado 2500 and GMC Sierra 2500 vehicles equipped with the enhanced towing option and 20-inch accessory tire/wheel package. The tire information label may state the incorrect rear tire pressure, resulting in underinflated tires and preventing the tire pressure monitoring system (TPMS) from displaying a low tire pressure warning.
Consequence: Driving with underinflated tires can increase the risk of a crash.
Remedy: Dealers will inspect, update the engine control module (ECM) software, apply a tire label overlay, inflate tires to the correct pressure, and perform a tire pressure monitor system (TPMS) re-learn process as necessary, free of charge. Owner notification letters were mailed September 17, 2026. Owners may contact Chevrolet customer service at 1-800-222-1020 or GMC customer service at 1-800-462-8782. GM's number for this recall is N262561970. Vehicle Identification Numbers (VIN) involved in this recall became searchable on NHTSA.gov on August 13, 2026.
NHTSA campaign 26V530000
28 owner complaints to NHTSA for the 2025 GMC SIERRA 2500
Owner Complaints
28 owner complaints filed with NHTSA for the 2025 GMC SIERRA 2500 (4 mention a crash, 2 an injury). See all on nhtsa.gov
| Service Brakes | 7 |
| Steering | 7 |
| Unknown Or Other | 6 |
| Engine | 4 |
| Power Train | 3 |
| Air Bags | 2 |
Complaints are unverified reports submitted to NHTSA by owners. They cover the whole model year, not a specific trim, and a count alone doesn't show how common a problem is.
Source: US National Highway Traffic Safety Administration (nhtsa.gov), matched as 2025 GMC SIERRA 2500. US-market vehicles only; data cached for up to 7 days.