Used 2021 GMC Sierra 2500HD for SaleNationwide

Summary

• With 90 currently listed for sale and an average price of $58,243 CAD, 33.3% of 2021 GMC Sierras 2500HD for sale on CarGurus are rated as good or great deals.

• Favourably reviewed: Owners rated the 2021 GMC Sierra 2500HD 5 / 5 stars.

• 100.0% of 2021 Sierra 2500HD models on CarGurus are accident free.

Why it stands out

The 2021 GMC Sierra 2500HD stands out as a heavy-duty pickup that leans more upscale than many rivals. In this generation, GMC offers more trim levels and a wider range of upscale options and features than the related Chevy Silverado 2500HD, and the Denali and Denali Ultimate trims are positioned as the most luxurious choices. For buyers who want a work truck that can still feel well equipped, that broader spread of comfort and premium content is a major part of its appeal.

The 2021 model also benefits from a strong mix of technology and capability. It comes with a 6.6-litre V8 gas engine paired with a six-speed automatic transmission, and it is also available with a 6.6-litre Duramax turbodiesel V8 engine and a 10-speed automatic transmission from Allison. Rear- and four-wheel drive are available, and the cabin can be had in Regular Cab, Crew Cab, or Double Cab form with 7' or 8'2" cargo bed options. Features such as Bluetooth, Android Auto, Apple CarPlay, and Wi-Fi hotspot accessibility help it feel more modern than many heavy-duty trucks, while available touches like remote keyless entry, rear-seat reminders, a Bose premium audio system, power-adjustable front seats, chrome grille trim, dual-zone automatic climate control, and power-folding tailgate options add to its everyday usability.

There are trade-offs, though. The 2021 GMC Sierra 2500HD is described as having numerous problems, including check engine lights tied to diesel particulate filters or emissions sensors, sluggish infotainment responses, rough or delayed shifts, electrical glitches, MultiPro tailgate flaws, and faulty trailer brake controllers. It is also noted that these trucks had very high MSRPs when new, so the used market can still reflect that premium positioning.

Other model years to consider

• 2024 GMC Sierra 2500HD

  • Average price: $78,758 CAD
  • Good/great deal percentage: 31.7%
  • User rating: 4.2 / 5
  • Total listings: 186

• 2025 GMC Sierra 2500HD

  • Average price: $92,770 CAD
  • Good/great deal percentage: 33.8%
  • User rating: 5 / 5
  • Total listings: 154

• 2020 GMC Sierra 2500HD

  • Average price: $56,496 CAD
  • Good/great deal percentage: 40.4%
  • User rating: 4.86 / 5
  • Total listings: 57

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