---
id: what-engine-options-does-the-2025-gmc-sierra-hd-have-2
title: "What engine options does the 2025 GMC Sierra HD have?"
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", "specifications"]
questions:
  - "What are the engine specs on the GMC Sierra HD?"
  - "Does the Sierra HD come with a diesel option?"
  - "How much horsepower does the Sierra HD have?"
related: [sierra-hd-trims-overview, sierra-hd-at4-offroad]
dealer: Markquart Motors
---

The 2025 GMC Sierra HD gives you two powerful choices. The standard 6.6-liter V8 gas engine delivers 401 horsepower and 464 lb-ft of torque, paired with a heavy-duty 10-speed automatic transmission. If you need maximum pulling power, the available 6.6-liter Duramax Turbo-Diesel V8 produces 470 horsepower and an impressive 975 lb-ft of torque-ideal for serious hauling and towing. Both engines are engineered for durability and real-world capability. To explore which engine best fits your work or lifestyle, call Markquart Motors at (715) 833-0444 or browse our current Sierra HD inventory online.