What engine is in a Chevy 2500HD?

The Silverado 2500HD today is offered with two engine choices: a 6.6-liter V8 gasoline engine and a 6.6-liter Duramax turbo-diesel. These options give buyers a balance between on-road usability and heavy-hauling capability.

Current engine options

Chevrolet currently provides two primary powertrains for the Silverado 2500HD, with performance figures that vary by year, trim, and configuration.

Gasoline engine

• 6.6-liter V8 gasoline (L8T) — Approximately 401 horsepower and around 464 lb-ft of torque.

Power and torque can differ by model year and drivetrain setup; always confirm exact specifications from the window sticker or dealership literature.

Duramax diesel engine

• 6.6-liter Duramax turbo-diesel (L5P) — About 445 horsepower and 910 lb-ft of torque.

As with the gasoline option, diesel output depends on year and configuration. Check the official specifications for the exact numbers on a given truck.

Historical engine options and timeline

Over the Silverado 2500HD’s history, Chevrolet has offered a broader mix of gasoline and diesel engines. The modern pairing of a 6.6L gas V8 and a 6.6L Duramax diesel reflects the current-generation lineup, while earlier generations used different engines.

Gasoline history

• 6.0-liter V8 gasoline (Vortec 6000) — A common option in earlier 2500HD models, valued for robust torque.


• 8.1-liter V8 gasoline — A larger-displacement gasoline option in some early-2000s trucks, later discontinued as Duramax moved into more HDs.

Engine availability varied by year; verify the exact motor in any given used or new truck.

Diesel history

• Duramax 6.6-liter family (LB7, LLY, LBZ, LMM, LML, L5P) — Chevrolet has used multiple Duramax variants since 2001, with the current generation being the 6.6L Duramax L5P.

Different Duramax generations offered changes in horsepower, torque, and emissions standards. When shopping, confirm the specific Duramax variant and its output for the model year in question.

What to consider when choosing an engine

Engine choice affects towing capacity, payload, maintenance costs, and daily drivability. Diesel engines generally provide more torque for heavy towing and better sustained fuel economy on long trips, while gasoline engines typically offer lower upfront cost and smoother quiet operation. Transmission pairing, axle ratio, and cab/bed configuration also influence overall performance.

To pick the right powertrain, consider your typical loads, towing needs, and how often you drive on highways versus job sites. Always review the exact engine, output, and drivetrain details listed for the vehicle you’re considering.

Summary

In its current form, the Chevy Silverado 2500HD offers two engine choices: a 6.6-liter V8 gasoline and a 6.6-liter Duramax turbo-diesel. The gasoline option provides solid everyday performance, while the diesel delivers maximum torque for towing and heavy-duty work. Historically, the model line has featured a range of V8 gasoline engines and a long-running Duramax diesel lineage, with exact numbers varying by year and configuration.

What is the difference between 6.6 L V8 and 6.6 L Duramax?

The main differences are that the 6.6L V8 is a gasoline engine that offers 401 hp and 464 lb-ft of torque, while the 6.6L Duramax is a turbo-diesel engine with significantly higher torque (470 hp and 975 lb-ft) and better fuel efficiency, especially when towing. The Duramax is the superior choice for heavy-duty towing and hauling, while the V8 is a more budget-friendly and capable option for lighter use. 
This video compares the 6.6L Duramax diesel with the 6.6L gas V8 in a Chevy Silverado HD: 28sBen HardyYouTube · Apr 21, 2023
6.6L V8 (Gasoline)

• Power: 401 horsepower and 464 lb-ft of torque.
• Best for: Everyday driving and lighter towing needs.
• Cost: Lower upfront cost compared to the Duramax.
• Fuel: Uses 87 octane fuel.
• Maintenance: Generally considered lower maintenance costs than diesel. 

6.6L Duramax (Turbo-Diesel)

• Power: 470 horsepower and 975 lb-ft of torque. 
• Best for: Heavy-duty towing and hauling due to its high torque. 
• Cost: Higher upfront cost, but potentially lower operating costs for high-mileage drivers due to better fuel efficiency under load. 
• Fuel: Uses diesel fuel and requires Diesel Exhaust Fluid (DEF). 
• Performance: Offers superior pulling power and a robust build for long-term durability under stress. 

This video discusses a comparison between Duramax diesel and 6.6L gas engines: 0:59PaxPowerYouTube · Jul 10, 2025
Which one should you choose?

• Choose the 6.6L Duramax if you frequently tow heavy loads or haul materials, as its massive torque is ideal for these tasks.
• Choose the 6.6L V8 if your truck's use is more for daily driving or occasional light towing. You will save money on the initial purchase, and it will handle most everyday tasks without issue. 

You can watch this video to see a review of the 6.6L V8 engine: 58sGetty's GarageYouTube · Oct 30, 2025

What year 2500HD to avoid?

Years to avoid for a 2500HD include 2003–2006 and 2014–2017 due to widespread electrical, transmission, and HVAC issues. For Ram 2500 models, the 2013 and 2018 models should be approached with caution due to engine and braking system problems respectively. More recent Ram trucks, specifically 2021-2023, have also had recalls for potential electrical and fire risks.
 
Chevrolet Silverado/GMC Sierra 2500HD

• 2003–2006: Known for a high number of owner complaints and reliability issues, especially with electrical systems, HVAC, and the engine management system. 
• 2014–2017: Models from this period, particularly 2014, 2015, and 2017, had numerous recalls and high complaint rates. 
  • 2014: Had frequent air conditioning and transmission issues. 
  • 2015: Had a large number of recalls and is known for suspension and transmission problems. 
  • 2017: Is frequently cited for significant transmission problems. 

Ram 2500

• 2013: Considered a poor year due to engine problems. 
• 2018: Has the most complaints, with many related to the braking system. 
• 2021–2023: Has a number of recalls and investigations regarding potential electrical shorts and fire risks. 

Does the Chevy 2500 and 3500 have the same engine?

When comparing the Chevy Silverado 2500 vs. 3500, both share the same engine options, so you're getting serious power regardless of your choice. The standard 6.6L V8 gas engine delivers 401 horsepower and 464 lb. -ft.

What engine does a 2500HD have?

Dealer Comments. The 2025 Chevy Silverado 2500 HD High Country stands as the pinnacle of heavy-duty luxury and performance. Powered by a formidable 6.6-liter V8 Duramax turbo-diesel engine, this truck delivers immense strength, refined comfort, and rugged off-road capability.