---
id: what-engines-are-available-in-the-2025-gmc-sierra-hd
title: "What engines are available in 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", "powertrain"]
questions:
  - "What engine options does the GMC Sierra HD have?"
  - "How much horsepower does the Sierra HD engine deliver?"
  - "Is there a diesel option for the Sierra HD?"
related: [sierra-hd-trims-overview, sierra-hd-denali-ultimate]
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-plenty of muscle for heavy loads and towing. If you want maximum capability, the available Duramax 6.6-liter Turbo-Diesel V8 produces 470 horsepower and an impressive 975 lb-ft of torque for truly demanding jobs.

Both pair with a heavy-duty 10-speed automatic transmission engineered for durability. The Denali Ultimate trim includes the Duramax diesel as standard, while it's optional on other trims. Ready to explore which engine fits your needs? Call Markquart Motors at (715) 833-0444 or browse our new GMC inventory online.