Used 2020 GMC Sierra 3500HD for Sale near Ontario

## Summary - With 62 currently listed for sale and an **average price of $59,303.00 CAD**, 27.4% of 2020 GMC Sierra 3500HDs for sale on CarGurus are rated as good or great deals. - **Favourably reviewed:** Owners rated the 2020 GMC Sierra 3500HD 5 / 5 stars. - **100.0% of 2020 Sierra 3500HD models on CarGurus are accident free**. ## Why it stands out The 2020 GMC Sierra 3500HD stands out in the heavy-duty truck segment for its impressive performance, particularly when it comes to towing and hauling capabilities. Designed for both functionality and comfort, the Sierra 3500HD features luxurious higher trim levels and advanced technology tailored for towing and off-roading. With the latest engine options, including a robust 6.6-litre Duramax turbodiesel V8 that produces an impressive 445 horsepower and 910 lb-ft of torque, this model ensures that it satisfies the demanding needs of its owners. Not only is the Sierra 3500HD appreciated for its durability and strength, but it also provides a refined driving experience, which is highlighted by its well-built interiors and upscale features. While it is not without competition—facing off against formidable rivals like the Ford F-350 and Ram 3500—the GMC model is often preferred among owners who value reliability and traditional truck capabilities within a modern framework. ## Other model years to consider - **[2024 GMC Sierra 3500HD](https://www.cargurus.ca/Cars/l-Used-2024-GMC-Sierra-3500HD-c32775)** - Average price: $82,734.00 CAD - Good/great deal percentage: 30.7% - User rating: 5 / 5 - Total listings: 150 - **[2025 GMC Sierra 3500HD](https://www.cargurus.ca/Cars/l-Used-2025-GMC-Sierra-3500HD-c33463)** - Average price: $95,078.00 CAD - Good/great deal percentage: 32.8% - User rating: 5 / 5 - Total listings: 119 - **[2023 GMC Sierra 3500HD](https://www.cargurus.ca/Cars/l-Used-2023-GMC-Sierra-3500HD-c32422)** - Average price: $76,604.00 CAD - Good/great deal percentage: 28.8% - Accident-free percentage: 100.0% - Total listings: 146 This analysis is based on CarGurus' proprietary market data from May 18, 2026, CarGurus experts' opinions, and generative AI.