Used 2021 GMC Sierra 1500 for Sale near Mississauga, ON

Summary

• With 117 currently listed for sale near Mississauga, ON and an average price of $37,597.00 CAD, 24.8% of 2021 GMC Sierras for sale on CarGurus are rated as good or great deals.

• Favourably reviewed: Owners rated the 2021 GMC Sierra 1500 4.9 / 5 stars and CarGurus experts gave it a 5.67 / 10.

• 100.0% of 2021 Sierra 1500 models on CarGurus are accident free.

Why it stands out

The 2021 GMC Sierra 1500 stands out as a full-size light-duty pickup that mixes familiar capability with a few distinctive touches. GMC describes it as the same basic truck as the Chevrolet Silverado 1500, but with different styling and a handful of unique features, including an optional carbon-fibre composite cargo bed. That gives the Sierra a more individual identity than its corporate twin, while still keeping it firmly in the mainstream of the segment.

What makes this model year especially interesting is that its strongest character comes from the available Duramax turbodiesel inline-six. The truck is said to be at its best with that engine unless you cannot live without the deeply satisfying rumble of a V8. That suggests the Sierra’s appeal is not just about traditional pickup muscle, but also about offering a more affordable diesel alternative for buyers who value efficiency and torque-oriented drivability. At the same time, the changes for this year are described as modest rather than dramatic, so the 2021 Sierra 1500 is best understood as a fundamentally appealing truck that still benefits from attention to the details.

Other model years to consider

• 2025 GMC Sierra 1500

  • Average price: $64,080.00 CAD
  • Good/great deal percentage: 41.1%
  • User rating: 5 / 5
  • Total listings: 219

• 2022 GMC Sierra 1500

  • Average price: $44,594.00 CAD
  • Good/great deal percentage: 27.5%
  • User rating: 5 / 5
  • Total listings: 171

• 2024 GMC Sierra 1500

  • Average price: $53,083.00 CAD
  • Good/great deal percentage: 43.6%
  • User rating: 4.64 / 5
  • Total listings: 225

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