Used 2020 GMC Sierra 3500HD for Sale nearChicago, IL

How much does the 2020 GMC Sierra 3500HD cost?

Prices have softened 8.11% compared to this time last year, making it a favorable time to shop this model year.

There are 466 listings available, which gives you a meaningful amount of inventory to compare.

Is the 2020 GMC Sierra 3500HD a good car?

Yes — the 5/5 user rating points to strong owner satisfaction. Owners consistently praise its impressive performance when pulling heavy loads, along with a comfortable and well-built feel. The overview also shows that you can use it as either a serious commercial-duty truck or a more upscale heavy-duty pickup, depending on the cab, trim, and equipment you choose. With 28.3% of listings marked as good or great deals, you have some room to shop selectively.

Is the 2020 GMC Sierra 3500HD reliable?

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

The owner feedback highlights a truck that feels dependable in heavy-duty use, especially when you need it to handle demanding towing work. That kind of praise matters for used buyers because it suggests the truck can be counted on for serious jobs if it has been maintained properly. For long-term ownership, your biggest risk is buying one that has been worked hard without enough documentation or care.

What should I look for when buying a used 2020 GMC Sierra 3500HD?

Accident-free inventory is solid at 75.3% — always verify the vehicle history report.

You should start with a history report so you can confirm accident status, title history, and prior use. After that, prioritize a thorough inspection of the truck’s condition, especially if it was used for towing or commercial work. Focus on signs of wear that could affect long-term ownership, since heavy-duty trucks can vary a lot depending on how they were used.

Is now a good time to buy a used 2020 GMC Sierra 3500HD?

This looks like a moderate market, so you can shop selectively without expecting every listing to be a bargain.

• Deal availability: 28.3% of listings are priced as good or great deals.
• Inventory: There are 466 listings available.
• Price trend: Prices have softened 8.11% compared with last year.
• Clean inventory: 75.3% of listings are accident-free.

If you find a listing below $50,336, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2020 GMC Sierra 3500HD's resale value?

The current average of $50,646 sits slightly below last year's $55,114.

That price movement suggests the market has cooled, which can help you buy more confidently now but may also limit short-term upside if you plan to resell soon. For a future seller, the key takeaway is that value retention will depend heavily on condition, mileage, and how well the truck was maintained. A well-kept example should still appeal to buyers who want heavy-duty capability and a more refined presentation.

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 2020 GMC Sierra 3500HD or consider a different year?

If you're weighing the 2020 against nearby model years, here's how to think about it:

Choose the 2020 if:

• 28.3% of listings are priced as good or great deals.
• Accident-free inventory is solid at 75.3% — always verify the vehicle history report.
• Price trend: Prices have softened 8.11% compared with last year.
• Owners rate it 5/5 — a strong satisfaction signal.

The bottom line: If you want the redesigned heavy-duty Sierra with strong towing credentials, broad configuration choices, and a refined feel, the 2020 is the primary year to target. If your priority is stretching your budget further, you can also compare nearby years and focus on the best-maintained truck rather than the newest badge.

These recommendations are based on CarGurus' proprietary market data from September 15, 2026, CarGurus experts' opinions, and generative AI.