Used 2020 GMC Sierra 2500HD for Sale nearDenver, CO

How much does the 2020 GMC Sierra 2500HD cost?

Prices have softened 5.21% compared to this time last year, making it a favorable time to shop this model year.

With 1,142 listings available, you have a solid amount of inventory to compare across trims and equipment levels.

If you find a listing below $48,777.18, that's toward the low end of the year-round range and worth acting on quickly.

Is the 2020 GMC Sierra 2500HD a good car?

Yes — the 4.86/5 user rating points to strong owner satisfaction, and the expert rating is 8.17/10. The standout strength is Form and function at 10/10.

Owners consistently praise its performance, comfort, towing capabilities, and power, and many also call out the appealing features. The truck’s capability and upscale identity fit buyers who want serious heavy-duty utility without giving up a more premium feel.

The trade-offs are clear: the expert notes poor value for money and interior materials that feel cheap. The overview also frames it as a truck for buyers who prioritize capability and utility, even if the luxury execution is not fully convincing.

With 26.2% of listings priced as good or great deals, you have room to shop selectively.

Is the 2020 GMC Sierra 2500HD reliable?

Owners rate it 4.86/5, a strong signal of long-term satisfaction.

The owner summary points to a truck that feels dependable in daily use, with praise centered on performance, comfort, towing capabilities, and power. That kind of feedback usually matters most when you want a heavy-duty truck you can count on for work and towing.

The expert drive data also emphasizes that the diesel delivers massive, stump-pulling grunt and that the transmission manages power incredibly well, which supports the sense of durability under load. The cost-effectiveness notes also point to a truck built for buyers who need capability and comfort in a demanding-use package.

For used buyers, the main long-term ownership risk is paying a premium for a truck that may have been worked hard, so condition and maintenance history matter a lot.

What should I look for when buying a used 2020 GMC Sierra 2500HD?

At 73.6% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.

You should start with a vehicle history report and then prioritize a pre-purchase inspection, especially if the truck has towing equipment, heavy-use wear, or signs of cosmetic repair. Focus on how the truck was used, whether the cabin and bed show hard-service wear, and whether the major features work as expected.

Key things to evaluate:

• Trim level: The base truck comes with a V8 engine and a 7-inch touchscreen with Apple CarPlay and Android Auto, but frills are minimal. The SLE adds 17-inch aluminum wheels, trailering mirrors, an EZ lift-and-lower tailgate, a larger driver-information screen, WiFi hotspot capability, cruise control, carpeted floor covering, remote keyless entry, and a leather-wrapped steering wheel. The SLT adds 18-inch wheels, LED bed lighting, LED fog lights, chrome accents, power-release and Multi-Pro tailgate functionality, 10-way power-adjustable front seats, power outlets, and an 8-inch infotainment screen. The Denali adds a full leather interior, wood-grain inserts, navigation, wireless device charging, and a Bose premium sound system. The best-value trim is often the SLT if you want a strong mix of upscale features without Denali pricing.
• Powertrain: You get two 6.6-liter V8 choices: a gas engine with 401 horsepower and 464 pound-feet of torque, or a Duramax diesel with 445 hp and 910 lb-ft. The gas engine uses a 6-speed automatic, while the diesel uses a 10-speed Allison transmission. The diesel brings huge low-end torque and especially strong towing feel, while the gas engine is the simpler path.
• Safety package: Standard equipment includes front- and side-impact airbags, traction control, a reversing camera, and a tire pressure monitoring system. Driver Alert Package I adds front and rear parking sensors, blind-spot monitoring, and rear cross-traffic alert. Driver Alert Package II adds forward-collision avoidance, lane-departure warning, and automatic high beams.
• Infotainment: The standard setup is a 7-inch touchscreen with GMC Infotainment 3, Apple CarPlay, and Android Auto. The SLT and Denali move up to an 8-inch screen, and both are available with navigation. The Denali also adds an 8-inch color driver-information screen.
• Fuel efficiency: In mixed driving, the truck returned 16.5 miles per gallon.

Which 2020 GMC Sierra 2500HD trim should I buy?

The 2020 GMC Sierra 2500HD is offered in 4 trim levels: Sierra, SLE, SLT, Denali.

Here's the short version:

• Sierra: This is the most affordable entry point, and it already gives you the core heavy-duty hardware plus a 7-inch touchscreen with Apple CarPlay and Android Auto. It makes sense if you want the truck’s capability first and can live without many comfort upgrades.
• SLE: This is the smart step up if you want a better everyday experience without jumping too far in price. You get useful upgrades like trailering mirrors, an EZ lift-and-lower tailgate, a larger driver display, WiFi hotspot capability, cruise control, and a leather-wrapped steering wheel.
• SLT: This is the best-value trim for many shoppers because it adds a lot of the features people actually notice: 18-inch wheels, LED lighting, power-release and Multi-Pro tailgate functionality, power-adjustable front seats, power outlets, and the larger 8-inch infotainment screen. If you want a well-equipped truck without paying Denali money, this is the trim to target.
• Denali: This is the luxury-leaning choice, with a full leather interior, wood-grain trim, navigation, wireless charging, and a Bose premium audio system. Buy it if you want the most upscale cabin and are willing to pay for it.

The safety content also shows that the more advanced driver-assistance features are bundled in optional packages, so check carefully for Driver Alert Package I and Driver Alert Package II on any used example.

Is now a good time to buy a used 2020 GMC Sierra 2500HD?

This is a moderate, selective buyer’s market, so you can shop with some leverage if you stay disciplined.

• Deal availability: 26.2% of listings are priced as good or great deals.
• Inventory: There are 1,142 listings available.
• Price trend: Prices have softened 5.21% compared with last year.
• Clean inventory: 73.6% of listings are accident-free.

If you find a listing below $48,777.18, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2020 GMC Sierra 2500HD's resale value?

The current average of $49,100 sits slightly below last year's $51,798.

That price movement suggests the market has cooled enough to help you buy more selectively today. For a future seller, that also means resale value may depend heavily on condition, mileage, and equipment rather than just model-year desirability.

Because heavy-duty trucks often serve demanding roles, well-kept examples with desirable trims and strong equipment tend to hold attention better than rougher trucks. If you buy carefully now, you improve your odds of exiting later with less depreciation pain.

Vehicles with strong owner satisfaction ratings, like this model year's 4.86/5, tend to retain buyer demand, which supports resale value over time.

Is the 2020 GMC Sierra 2500HD safe?

It earns an 8/10 safety score from our experts.

Standard safety features include a full array of front- and side-impact airbags, traction control, a reversing camera, and a tire pressure monitoring system. Driver Alert Package I adds front and rear parking sensors, blind-spot monitoring, and rear cross-traffic alert, while Driver Alert Package II adds forward-collision avoidance, lane-departure warning, and automatic high beams.

The truck’s size and turning radius make maneuvering a challenge, especially in tight spaces, so the available camera and alert systems matter more here than they do on smaller vehicles. If you’re shopping used, make sure the truck has the driver-assistance package you want, because those features are not universal across every listing.

Should I buy a 2020 GMC Sierra 2500HD 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:

• 26.2% of listings are priced as good or great deals.
• At 73.6% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 5.21% compared with last year.
• Owners rate it 4.86/5 — a strong satisfaction signal.
• The 2020 stands out for its luxury-leaning Denali identity, strong towing capability, and broad appeal to buyers who want serious truck ability with a premium feel.

The bottom line: The 2020 is a good pick if you want a heavy-duty truck with strong owner satisfaction, a softer price trend, and enough inventory to shop selectively. If you’re especially price-sensitive, you may want to compare nearby years and focus on the best-equipped truck in the best condition rather than chasing the newest badge.

These recommendations are based on CarGurus' proprietary market data from August 28, 2026, CarGurus experts' opinions, and generative AI.