Used 2020 GMC Sierra 2500HD for Sale nearMadison, WI

How much does the 2020 GMC Sierra 2500HD cost?

Prices have softened 4.14% compared to this time last year, making it a favorable time to shop this model year.

There are 1,147 listings available, which gives you a solid pool of trucks to compare.

Is the 2020 GMC Sierra 2500HD a good car?

Yes — the 2020 GMC Sierra 2500HD earns a 4.86/5 user rating, and the expert test drive gives it an 8.17/10. The standout strength is Form and function at 10/10.

Owners consistently praise its performance, comfort, and towing capability, and they also highlight its power and appealing features. The trade-offs are that the truck is expensive for the year and model, and the cabin materials and fit and finish fall short of the luxury-truck image.

For you, that means this is a strong fit if you want heavy-duty capability with a premium-leaning feel and plenty of features, especially if you value towing and everyday comfort. It is less compelling if your priority is the most polished interior or the lowest purchase price.

31.0% of listings are priced as good or great deals, so there is some room to shop carefully.

Is the 2020 GMC Sierra 2500HD reliable?

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

The owner feedback points to a truck that feels dependable in daily use, with praise centered on performance, comfort, and towing capability. That kind of feedback suggests you can count on it for hard work and long-term ownership if the truck has been maintained well.

The expert test drive also reinforces its work-ready character, noting that the truck is built around serious capability and that the diesel version delivers massive, sustained power. The cost-effectiveness discussion adds that the diesel is a pricey option, so your long-term ownership risk is less about basic capability and more about paying for upkeep and choosing the right configuration for your needs.

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

At 73.2% 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 thorough pre-purchase inspection, especially on trucks that have been used for towing or heavy work. Pay close attention to body condition, signs of wear in the cabin, and whether the truck’s equipment and features operate as expected.

Key things to evaluate:

• Trim level: The base Sierra 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, a 4G LTE WiFi hotspot, cruise control, 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 tailgates, 10-way power 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.
• 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 is the stronger choice if you need maximum towing muscle, but it also adds cost.
• Safety package: Standard equipment includes front- and side-impact airbags, traction control, a reversing camera, and a tire pressure monitoring system. The Driver Alert Package I adds front and rear parking sensors, blind-spot monitoring, and rear cross-traffic alert. The 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 gives you the core heavy-duty hardware plus the standard 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 best-value trim for many shoppers because it adds useful everyday upgrades like trailering mirrors, an EZ lift-and-lower tailgate, a larger driver display, WiFi hotspot capability, cruise control, remote keyless entry, and a leather-wrapped steering wheel. If you want a more complete truck without jumping deep into luxury pricing, this is the trim to target.
• SLT: This is the sweet spot if you want a more upscale feel without going all the way to Denali pricing. You get 18-inch wheels, LED lighting, chrome accents, power-release and Multi-Pro tailgates, power front seats, power outlets, and the larger 8-inch infotainment screen.
• Denali: This is the luxury-leaning choice, with a full leather interior, wood-grain trim, navigation, wireless charging, and a Bose premium audio system. It suits you best if you want the most premium cabin and are willing to pay for it.

The safety package is a meaningful consideration on higher-trim or better-equipped trucks, since Driver Alert Package I and II add several useful driver-assistance features.

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

This is a moderate market for selective buyers, so you can shop with some leverage if you stay patient and compare listings carefully.

• Deal availability: 31.0% of listings are priced as good or great deals.
• Inventory: There are 1,147 listings available.
• Price trend: Prices have softened 4.14% compared with last year.
• Clean inventory: 73.2% of listings are accident-free.

If you find a listing below $48,762, 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 $49,351 sits slightly below last year's $51,483.

That decline suggests the market has eased, which can help you buy more confidently now but may also mean future resale gains are limited if prices continue to soften. For a seller, the key takeaway is that well-kept trucks with the right equipment should still attract interest, but you should not expect a rising-price environment to do the work for you.

Strong demand for capable heavy-duty trucks helps support value, especially when the truck is configured for towing and has desirable features. If you buy carefully and keep the truck in good condition, you should be in a better position when it is time to sell.

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?

The 2020 GMC Sierra 2500HD 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. The 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.

Because this truck is large and can be difficult to maneuver in tight spaces, the available camera and alert systems are especially useful. If you are comparing listings, it is worth prioritizing trucks that include the driver-assistance packages, since they add meaningful everyday safety support.

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:

• 31.0% of listings are priced as good or great deals.
• At 73.2% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 4.14% compared with last year.
• Owners rate it 4.86/5 — a strong satisfaction signal.
• The expert test drive highlights its luxury-leaning Denali identity, strong capability, and feature-rich setup.

The bottom line: The 2020 makes sense if you want a heavy-duty truck with strong capability, premium-leaning features, and a market that is a bit more buyer-friendly than it was a year ago. If you are especially price-sensitive, you can use the softer pricing and broad inventory to shop selectively and focus on well-equipped trucks with clean histories.

These recommendations are based on CarGurus' proprietary market data from September 11, 2026, CarGurus experts' opinions, and generative AI.