Used 2020 GMC Sierra 3500HD for Sale nearToronto, ON

Summary

• With 55 currently listed for sale and an average price of $60,390 CAD, 27.3% 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 as a heavy-duty truck that was redesigned to look and work bigger without losing its familiar GMC identity. It debuted as a 2020 model, grew by as much as 25 centimetres in length and 6 centimetres in height, and gained a slightly larger, blockier grille. More importantly, GMC said the new model made significant improvements to its maximum towing capacity, which increased by 53 percent in its most extreme case.

What makes this truck especially appealing is the breadth of its capability and configuration choices. Buyers could choose a regular cab, an extended cab, or a crew cab, along with either a 6’10” short bed or an 8’2” long bed, and could also select single- or dual-wheel rear axle setups. Two engines were offered: a 6.6-litre V8 with 401 horsepower and 464 pound-feet of torque, or a 6.6-litre Duramax turbodiesel V8 with 445 hp and 910 lb-ft of torque. At its maximum, the Sierra 3500HD could haul 3,375 kilograms and tow up to 16,100 kilograms, though those figures required the diesel engine, a single cab body, rear-wheel drive, a gooseneck hitch, and dual rear wheels.

The 2020 Sierra 3500HD also brought a wide spread of trims, from a basic work-focused model to luxury and off-road variants. Standard equipment on the base truck included a seven-inch infotainment touchscreen, Apple CarPlay and Android Auto, while higher trims added features such as trailering assist, leather upholstery, a Bose premium audio system, a head-up display, surround-view cameras, and, at the top end, premium touches like power-retracting running boards, cooled and massaging front seats, and a sunroof. Its main drawbacks are the same ones that often come with a truck of this size: it can be unwieldy in parking lots, top trims can be prohibitively expensive, and rivals typically can tow more.

Other model years to consider

• 2024 GMC Sierra 3500HD

  • Average price: $81,680 CAD
  • Good/great deal percentage: 31.7%
  • User rating: 5 / 5
  • Total listings: 205

• 2025 GMC Sierra 3500HD

  • Average price: $94,220 CAD
  • Good/great deal percentage: 40.2%
  • User rating: 5 / 5
  • Total listings: 174

• 2023 GMC Sierra 3500HD

  • Average price: $73,795 CAD
  • Good/great deal percentage: 28.6%
  • Total listings: 175

This analysis is based on CarGurus' proprietary market data from September 7, 2026, CarGurus experts' opinions, and generative AI.