Used 2020 GMC Sierra 2500HD for Sale near Ontario

Summary

• With 51 currently listed for sale and an average price of $57,345.00 CAD, 31.4% 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 broader 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 positioning gives the Sierra 2500HD a more premium feel for buyers who want a work-capable truck without giving up cabin polish.

It is also notable for the breadth of equipment available. The 2020 GMC Sierra 2500HD could be had with Bluetooth, Android Auto, Apple CarPlay, and Wi-Fi hotspot accessibility through the GMC infotainment system, while available touches included remote keyless entry and rear-seat reminders. Higher-end versions could add a Bose premium audio system, power-adjustable front seats, chrome grille trim, dual-zone automatic climate control, and power-folding tailgate options. In Canada, it was offered in Pro, SLE, SLT, AT4, AT4X, Denali, and Denali Ultimate trims, with Regular Cab, Crew Cab, and Double Cab body styles and 7-foot or 8-foot-2-inch cargo beds.

Under the bonnet, the 2020 GMC 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. 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 focused on luxury cabin features. The main trade-offs are that these trucks had very high MSRPs when new, and used examples can still be expensive; this generation is also known for issues including 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: $79,849.00 CAD
  • Good/great deal percentage: 23.5%
  • User rating: 4.2 / 5
  • Total listings: 162

• 2021 GMC Sierra 2500HD

  • Average price: $59,595.00 CAD
  • Good/great deal percentage: 35.1%
  • User rating: 5 / 5
  • Total listings: 74

• 2025 GMC Sierra 2500HD

  • Average price: $92,525.00 CAD
  • Good/great deal percentage: 24.0%
  • User rating: 5 / 5
  • Total listings: 129

This analysis is based on CarGurus' proprietary market data from August 10, 2026, CarGurus experts' opinions, and generative AI.