---
id: what-engine-options-are-available-on-the-2025-gmc-sierra-hd
title: "What engine options are available on the 2025 GMC Sierra HD?"
category: faq
subtopic: sierra-hd-engines
page_type: faq
source_url: "https://www.markquartmotors.com/research/gmc/sierra-hd/trims.htm"
tags: ["GMC", "Sierra HD", "engines", "power"]
questions:
  - "What engines does the GMC Sierra HD have?"
  - "How much horsepower does the Sierra HD deliver?"
  - "What's the difference between the gas and diesel engines?"
related: [sierra-hd-denali-ultimate, sierra-hd-at4x]
dealer: Markquart Motors
---

The 2025 GMC Sierra HD gives you two powerful engine choices.

The standard 6.6-liter V8 gas engine delivers 401 horsepower and 464 lb-ft of torque-proven power for hauling and towing. If you need even more capability, the available 6.6-liter Duramax Turbo-Diesel V8 pumps out 470 horsepower and an impressive 975 lb-ft of torque, making it ideal for the heaviest jobs and most demanding terrain.

Both pair with a heavy-duty 10-speed automatic transmission built for durability. At Markquart Motors in Chippewa Falls, our team can walk you through which engine fits your work or lifestyle best. Call us at (715) 833-0444 or browse our new Sierra HD inventory online to find your perfect fit.