Used 2021 GMC Sierra 2500HD for Sale nearScarborough, ON

How much does the 2021 GMC Sierra 2500HD cost?

Prices are up 1.84% year-over-year — a sign of continued demand for this model year.

There are 85 listings available, which gives you a modest amount of choice in the used market.

Is the 2021 GMC Sierra 2500HD a good car?

Yes — the 5/5 user rating suggests strong owner satisfaction for this heavy-duty pickup. The 2021 Sierra 2500HD is positioned as a more upscale alternative to many rivals, with a broader range of trims and available comfort features than the related Chevrolet Silverado 2500HD. That makes it a fit if you want serious work-truck capability without giving up a more premium feel, and the available cab styles, bed lengths, and trim range give you flexibility to match the truck to your needs.

29.4% of listings are priced as good or great deals, which gives you some room to shop selectively.

Is the 2021 GMC Sierra 2500HD reliable?

Owners rate it 5/5, a strong signal of long-term satisfaction.

The 2021 Sierra 2500HD does have a strong equipment list, but used buyers should still pay close attention to known trouble spots such as diesel emissions-related warnings, infotainment sluggishness, rough or delayed shifts, electrical glitches, MultiPro tailgate faults, and trailer brake controller issues. For a used heavy-duty truck, that means a careful inspection and a thorough test drive matter a lot, especially if you plan to keep it for demanding work.

Is now a good time to buy a used 2021 GMC Sierra 2500HD?

This is a moderate, selective buyer’s market, so you can shop with some patience and still find worthwhile listings.

• Deal availability: 29.4% of listings are priced as good or great deals.
• Inventory: There are 85 listings available.
• Price trend: Prices are up 1.84% year-over-year.

If you find a listing below $56,167 CAD, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2021 GMC Sierra 2500HD's resale value?

The current average of $60,387 CAD sits slightly above last year's $59,297 CAD.

That upward move suggests the market still places solid value on this model year, especially given its premium positioning and broad trim range. If you buy well and keep the truck in good condition, the current pricing trend gives you a decent starting point for future resale. Strong equipment and a desirable trim can help, but condition and maintenance history will matter a lot in this segment.

Vehicles with strong owner satisfaction ratings, like this model year's 5/5, tend to retain buyer demand, which supports resale value over time.

Should I buy a 2021 GMC Sierra 2500HD or consider a different year?

If you're weighing the 2021 against nearby model years, here's how to think about it:

Choose the 2021 if:

• 29.4% of listings are priced as good or great deals.
• Price trend: Prices are up 1.84% year-over-year.
• Owners rate it 5/5 — a strong satisfaction signal.

Consider the 2022 if:

• At $61,784 CAD, the 2022 costs more than the current year's $60,387 CAD average.
• It broadens the truck’s appeal by blending heavy-duty capability with more work-and-play versatility.

The bottom line: Choose the 2021 if you want a premium-feeling heavy-duty truck and you find a well-priced example. If you’re more price-sensitive, the 2021 is the better value play versus moving up to the 2022, especially when you can find a listing near the lower end of the current price range.

These recommendations are based on CarGurus' proprietary market data from October 6, 2026, CarGurus experts' opinions, and generative AI.