Sierra 2500 Engines
2025 GMC Sierra 2500 HD Engines & Towing Capacity | Gas vs. Diesel Specs
Harness exceptional power with the 2025 GMC Sierra 2500 HD, designed to tackle your most demanding off-road excursions and trailering jobs with ease. Equipped with a choice of a robust 6.6L V8 gas or turbo diesel engine, the Sierra 2500 HD delivers impressive performance and reliability for your heavy-duty needs. Additionally, with a remarkable conventional towing capacity of up to 20,000 pounds, this pickup is the perfect workhorse for any task. This guide, created by the team at W-K Chevrolet Buick GMC, highlights key specifications and capacities of the 2025 GMC Sierra 2500 HD engines.
Continue your research with our Sierra 2500 HD review for a comprehensive overview of features, specifications, and the different models available. View our Sierra 2500 HD trims guide for detailed lists of each model's standard features.
Check out our latest inventory of Sierra 2500 HD trucks. Find a model you like, then arrange a test drive to get a feel for its features and capabilities. Our team is available to help with any questions you may have when you reach out to us online or call us at (660) 826-8320.
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2025 GMC Sierra 2500 HD Gas vs. Diesel Engine Specs
With exceptional performance and versatility from both gas and diesel engine options, the 2025 GMC Sierra 2500 HD ensures it meets the needs of your busy days and demanding tasks. The standard 6.6L gas V8 engine generates an impressive 401 horsepower and 464 pound-feet of torque, providing robust capability for everyday tasks. For those requiring even more muscle, the available 6.6L Duramax® turbo diesel V8 engine delivers 470 horsepower and a staggering 975 pound-feet of torque, making it ideal for heavy towing and hauling.
Both engines are paired with a responsive Allison® ten-speed automatic transmission for enhanced efficiency, and are available with rear-wheel drive (RWD) and four-wheel drive (4WD). With an impressive towing capacity of up to 20,000 pounds depending on your chosen engine and cab configuration, the Sierra 2500 HD ensures you can confidently handle every job, big or small.
View the 2025 Sierra 2500 HD engine specifications in the accompanying table.
| Engine | 6.6L gas V8 | Duramax 6.6L turbo diesel V8 |
|---|---|---|
| Horsepower | 401 HP | 470 HP |
| Torque | 464 lb.-ft. | 975 lb.-ft. |
| Drivetrain | RWD / 4WD | RWD / 4WD |
| Transmission | Allison ten-speed automatic | Allison ten-speed automatic |
2025 GMC Sierra 2500 HD Towing & Payload Capacity Chart
The 2025 GMC Sierra 2500 HD is an impressive choice for towing and hauling substantial loads. Opting for a regular cab setup with the Duramax V8 engine and Max. Trailering Package enables you to take full advantage of this truck's outstanding fifth-wheel/gooseneck trailering capacity. For the highest conventional towing potential, go for the crew cab with the Duramax V8 engine, capable of reaching a maximum of 20,000 pounds. You can find the towing and payload capacities of the 2025 GMC Sierra 2500 HD cab sizes in the accompanying table.
| 2025 GMC Sierra 2500 HD Cab Size | Max. Payload Capacity* | Max. Conventional Trailering Capacity* | Max. Fifth-Wheel/Gooseneck Trailering Capacity* |
|---|---|---|---|
| Regular | 4,064 lbs. | 14,500 lbs. | 22,390 lbs. |
| Double | 3,788 lbs. | 17,900 lbs. | 18,600 lbs. |
| Crew | 3,859 lbs. | 20,000 lbs. | 21,870 lbs. |
*When properly equipped.
2025 GMC Sierra 2500 HD Towing Technology Available
The 2025 GMC Sierra 2500 HD is equipped with a wealth of advanced trailering technology, providing effortless hitching and comprehensive views as you navigate loading, unloading, and driving. A trailering package is standard on the Sierra 2500 HD, which includes a 2.5-inch hitch receiver, wiring harnesses, and hitch guidance through your rearview camera. Select trims feature the innovative ProGrade® trailering system with enhanced trailering technology and offer up to 14 unique camera views.
Available towing technology includes:
- Up to 14 available camera views
- HD surround vision
- Transparent trailer view
- Hitch view
- Cargo bed view with zoom view and hitch guidelines
- Front camera view
- Rear camera view
- Surround view
- Front top-down view
- Rear top-down view
- Front side view
- Rear side view with trailer biasing
- Rear trailer view with guidelines and trailer angle indicator
- Inside trailer view
- Picture-in-picture view
- ProGrade trailering tech
- Trailer side blind zone alert
- Trailer sway control
- Trailer length indicator
- Trailer brake controller
- Trailer angle indicator with jack-knife alert
- Gross combined weight (GCW) alert
- Trailer light test
- Trailer theft detection
- Maintenance reminders
- Customizable trailer profiles
- Predeparture checklists
- Tow/Haul mode
- Trailering mirrors
Learn More About the GMC Sierra 2500 HD
Check out our Sierra 2500 HD review to explore more about its design, technology, and available color options. Already decided on the Sierra 2500 HD? Visit our Sierra 2500 HD trims guide for each model's standard features. When you're ready, shop our new inventory to select your ideal pickup truck, and drop by our GMC dealership in Sedalia, MO, for a test drive. If you have any questions, don’t hesitate to get in touch with us online or call us at (660) 826-8320.
May not represent actual vehicle. (Options, colors, trim and body style may vary)
The Manufacturer's Suggested Retail Price excludes tax, title, license, dealer fees and optional equipment. Dealer sets final price.