Used 2020 GMC Sierra 2500HD for Sale nearToronto, ON

Summary

• With 57 currently listed for sale and an average price of $56,496 CAD, 40.4% of 2020 GMC Sierras 2500HD for sale on CarGurus are rated as good or great deals.

• Favourably reviewed: Owners rated the 2020 GMC Sierra 2500HD 4.86 / 5 stars.

• 100.0% of 2020 Sierra 2500HD models on CarGurus are accident free.

Why it stands out

The 2020 GMC Sierra 2500HD stands out as a heavy-duty pickup that leans more upscale than many rivals. In this generation, GMC offered 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 were described as more luxurious than the Silverado’s top-tier High Country trim. That makes the Sierra 2500HD especially appealing to buyers who want serious truck capability without giving up a more premium cabin experience.

For 2020, the Sierra 2500HD came with a 6.6-litre V8 gas engine paired with a six-speed automatic transmission, and it was also available with a 6.6-litre Duramax turbodiesel V8 engine and a 10-speed automatic transmission from Allison. Rear- and four-wheel drive were available, and the truck could be had in Pro, SLE, SLT, AT4, AT4X, Denali, and Denali Ultimate trims, with Regular Cab, Crew Cab, and Double Cab body styles and 7' or 8'2" cargo bed options. The AT4 models added off-road hardware and accessories such as skid plates, off-road suspension upgrades, and a more robust transfer case, while the Denali trims added luxury cabin features.

The 2020 Sierra 2500HD also benefited from a broad list of convenience and technology features, including Bluetooth, Android Auto, Apple CarPlay, and Wi-Fi hotspot accessibility. Available equipment included remote keyless entry and rear-seat reminders, while more upscale models could be fitted with a Bose premium audio system, power-adjustable front seats, chrome grille trim, dual-zone automatic climate control, and power-folding tailgate options. At the same time, buyers should be aware that these trucks had very high MSRPs when new, and used examples can still be expensive. The generation is also known for issues such as check engine lights, infotainment sluggishness, rough or delayed shifts, electrical glitches, MultiPro tailgate faults, and trailer brake controller problems.

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

• 2021 GMC Sierra 2500HD

  • Average price: $58,243 CAD
  • Good/great deal percentage: 33.3%
  • User rating: 5 / 5
  • Total listings: 90

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