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

The 2025 GMC Sierra HD gives you two powerful engine choices. The standard engine is a 6.6-liter V8 gas engine with 401 horsepower and 464 lb-ft of torque-engineered for durability and paired with a heavy-duty 10-speed automatic transmission. If you need maximum towing and hauling power, the optional 6.6-liter Duramax Turbo-Diesel V8 delivers 470 horsepower and an impressive 975 lb-ft of torque. Both engines are built to handle serious workloads and rugged terrain. The Denali Ultimate trim includes the Duramax as standard; other trims offer it as an available upgrade. Ready to see which engine fits your needs? Call Markquart Motors at (715) 833-0444 or browse our 2025 GMC Sierra HD inventory online.