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2025 GMC Sierra 2500: What's New, Specs & Features
Last updated August 4, 2026
An integrated trailer brake controller became standard on every 2025 GMC Sierra 2500 HD trim. Beyond that and a few trim-level equipment updates, this is largely a carryover year rather than a redesign.
About the 2025 GMC Sierra 2500
4th generation (introduced for 2020), one year after the 2024 mid-cycle refresh
GMC positions the Sierra 2500 HD as a heavy-duty towing and hauling truck with a broad range of comfort and specialty versions. Its core strengths are 6.6L engine power, integrated trailering hardware, a large cargo bed, and configurations spanning job-site-focused Pro through off-road AT4X and richly equipped Denali models. It stands apart through premium cabin choices and towing technology while retaining commercial-grade capability.
The range runs from the straightforward Pro work truck through the better-equipped SLE and SLT, with AT4 and AT4X focused on off-road use and Denali models emphasizing comfort. AT4X stands out with a 1.5-inch suspension lift, heavy-duty off-road shock absorbers, extra underbody protection, and massaging front seats. The highest-level Denali trim pairs the Duramax turbo-diesel V8 with full-grain leather, 12-speaker Bose audio, and a head-up display.
What changed, by category
Towing equipment
An integrated trailer brake controller became standard on every trim.
Safety
Adaptive cruise control with trailering became standard on AT4 and Denali; it was optional on those trims for 2024.
Cabin equipment
A tilt-adjustable steering wheel became standard on Pro and SLE; it was optional on those trims for 2024.
2025 GMC Sierra 2500 specs and features by trim
| Feature | |||||||
|---|---|---|---|---|---|---|---|
| Engine | V8, Turbo Diesel, 6.6 Liter / V8, 6.6 Liter | V8, 6.6 Liter / V8, Turbo Diesel, 6.6 Liter | V8, Turbo Diesel, 6.6 Liter / V8, 6.6 Liter | V8, Turbo Diesel, 6.6 Liter / V8, 6.6 Liter | V8, Turbo Diesel, 6.6 Liter / V8, 6.6 Liter | V8, Turbo Diesel, 6.6 Liter / V8, 6.6 Liter | V8, Turbo Diesel, 6.6 Liter |
| Transmission | Automatic, 10-Spd Allison | Automatic, 10-Spd Allison | Automatic, 10-Spd Allison | Automatic, 10-Spd Allison | Automatic, 10-Spd Allison | Automatic, 10-Spd Allison | Automatic, 10-Spd Allison |
| Drivetrain | 4WD | 4WD | 4WD | 4WD | 4WD | 4WD | 4WD |
| Fuel Type | Diesel / Gas | Gas / Diesel | Diesel / Gas | Diesel / Gas | Diesel / Gas | Diesel / Gas | Diesel |
| Horsepower | 401–470 hp | 401–470 hp | 401–470 hp | 401–470 hp | 401–470 hp | 401–470 hp | 470 hp |
| Torque | 464–975 lb-ft | 464–975 lb-ft | 464–975 lb-ft | 464–975 lb-ft | 464–975 lb-ft | 464–975 lb-ft | 975 lb-ft |
| Max Towing | 18500 lb | 18000–22050 lb | 18000–22050 lb | 20000 lb | 18500 lb | 20000 lb | 20000 lb |
| Rear Legroom | 43.4 in | 35.2–43.4 in | 35.2–43.4 in | 43.4 in | 43.4 in | 43.4 in | 43.4 in |
| Seats | 5 | 3–6 | 3–6 | 6 | 5 | 5 | 5 |
| Doors | 4 | 2–4 | 2–4 | 4 | 4 | 4 | 4 |
| Adaptive Cruise Control | |||||||
| Alarm System | |||||||
| Automatic Emergency Braking | |||||||
| Automatic High Beams | |||||||
| Blindspot Sensors | |||||||
| Hill Descent Control | |||||||
| Lane Departure Warning | |||||||
| Park Assist | |||||||
| Rain Sensing Windshield Wipers | |||||||
| Rear View Camera | |||||||
| 360 Camera | |||||||
| Alloy Wheels | |||||||
| Fog Lights | |||||||
| LED Headlights | |||||||
| Memory Exterior Mirrors | |||||||
| Power Moonroof | |||||||
| Power Folding Exterior Mirrors | |||||||
| Power Side Steps | |||||||
| Privacy Glass | |||||||
| Side Steps | |||||||
| Head-Up Display | |||||||
| Navigation System | |||||||
| Premium Audio | |||||||
| SD Card Slot | |||||||
| Satellite Radio | |||||||
| Smartphone Interface | |||||||
| Subwoofer | |||||||
| Touch Screen Monitor | |||||||
| Auto-Dimming Interior Mirror | |||||||
| Dual Power Front Seats | |||||||
| Dual-Zone Climate Control | |||||||
| Heated Front Seats | |||||||
| Heated Rear Seats | |||||||
| Heated Steering Wheel | |||||||
| Integrated Garage Door Opener | |||||||
| Leather Seats | |||||||
| Leather-Wrapped Steering Wheel | |||||||
| Massage Front Seat | |||||||
| Memory Driver's Seat | |||||||
| Power Driver Seat | |||||||
| Push-Button Engine Start | |||||||
| Remote Start | |||||||
| Tilt Wheel | |||||||
| Tilt/Telescoping Steering Wheel | |||||||
| Ventilated Front Seats | |||||||
Frequently asked questions
What is the biggest change to the 2025 GMC Sierra 2500 HD?
The biggest change is a standard integrated trailer brake controller on every 2025 Sierra 2500 HD. It provides built-in control for compatible trailer brakes.
Is the 2025 GMC Sierra 2500 HD a redesign?
No, the 2025 Sierra 2500 HD is not a redesign. It is a light equipment update following the larger 2024 refresh, with the basic styling, structure, engines, transmission, and infotainment carrying over.
Which 2025 Sierra 2500 HD trims gained standard adaptive cruise control?
The AT4 and Denali gained standard adaptive cruise control with trailering for 2025. It was optional on those two trims for 2024.
Did the 2025 GMC Sierra 2500 HD engines or transmission change?
No, the 2025 Sierra 2500 HD carries over its 6.6-liter gas V8 and 6.6-liter Duramax turbo-diesel V8. The 10-speed automatic transmission also continues without a major change.
What changed on the 2025 Sierra 2500 HD Pro and SLE?
The Pro and SLE gained a standard integrated trailer brake controller and a standard tilt-adjustable steering wheel for 2025. The controller improves built-in towing readiness, while the adjustable wheel helps drivers find a comfortable position.
2025 GMC Sierra 2500 Reviews
What owners are saying about the 2025 GMC Sierra 2500.
4.6
2025 GMC Sierra 2500
(22 reviews)
“GMC trucks are awesome! However, in the state of California, it would be nice to know beforehand that roof marker lamps are not available on single rear wheel drive trucks! The turning signal handle is a little mushy! I would prefer it to be much more crisp like the feeling I have with my other vehicles!”