Used 2021 GMC Sierra 2500HD for Sale nearEtobicoke, ON

How much does the 2021 GMC Sierra 2500HD cost?

Prices have held steady compared to this time last year, signaling a stable and predictable market for this model year.

There are 76 listings available, which gives you a modest amount of inventory to compare before you buy.

Is the 2021 GMC Sierra 2500HD a good car?

Yes — the 5/5 user rating suggests you’re looking at a truck that satisfies owners well. The 2021 Sierra 2500HD stands out as a heavy-duty pickup that leans more upscale than many rivals, with a broader range of trim levels and upscale options than the related Chevrolet Silverado 2500HD. That makes it a strong fit if you want serious work-truck capability without giving up comfort or a more premium feel. 32.9% 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 offers a strong equipment list, including Bluetooth, Android Auto, Apple CarPlay, and Wi-Fi hotspot accessibility through the GMC infotainment system, which supports everyday usability. It also brings available comfort and convenience features such as 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. At the same time, used fourth-generation Sierra 2500HD models are known for issues including check engine lights tied to diesel particulate filters or emissions sensors, sluggish infotainment responses, rough or delayed shifts, electrical glitches, MultiPro tailgate faults, and faulty trailer brake controllers. For used buyers, that means long-term ownership risk is worth checking carefully through a thorough inspection and service history review.

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

This looks like a moderate, selective buyer’s market, so you can shop patiently and still find worthwhile listings.

• Deal availability: 32.9% of listings are priced as good or great deals.
• Inventory: There are 76 listings available.
• Price trend: Prices have held steady compared with last year.

If you find a listing below $56,149 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 $58,247 CAD sits slightly below last year's $58,537 CAD.

That small decline suggests the market has been fairly stable, which is helpful if you plan to sell later because it points to predictable pricing rather than sharp swings. The current range also shows that well-kept examples can still command strong money, especially when they’re equipped and presented well. If you buy carefully and keep maintenance records, you should be in a reasonable position to protect value over time.

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:

• 32.9% of listings are priced as good or great deals.
• Price trend: Prices have held steady compared with last year.
• Owners rate it 5/5 — a strong satisfaction signal.

Consider the 2022 if:

• At $60,470 CAD, the 2022 costs more than the current year's $58,247 CAD average.
• It broadens appeal with more work-and-play capability, including off-road ability, infotainment, trailering technology, and safety.

The bottom line: The 2021 is the better starting point if you want a premium-feeling heavy-duty truck and value stability in the used market. If you’re price-sensitive, the 2021 makes more sense than stepping up to the 2022, while still giving you strong capability and a broad feature set.

These recommendations are based on CarGurus' proprietary market data from October 20, 2026, CarGurus experts' opinions, and generative AI.