Used 2020 GMC Sierra 2500HD for Sale nearMobile, AL

How much does the 2020 GMC Sierra 2500HD cost?

Prices have softened 4.64% compared to this time last year, making it a favorable time to shop this model year.

There are 1,199 listings available, which gives you a solid pool of trucks to compare on price, trim, and equipment.

Is the 2020 GMC Sierra 2500HD a good car?

Yes — owners rate it 4.86/5, and the expert rating is 8.17/10. The standout strength is Form and function at 10/10.

Owners consistently praise its performance, comfort, and towing capability, and many also call out its power and appealing features. That lines up with the truck’s role as a heavy-duty model that still aims for a more premium feel, especially if you want serious capability without giving up a feature-rich cabin.

The trade-offs are clear, though: the expert review says the interior materials feel cheap and the truck is poor value for money. Even so, if you want a heavy-duty pickup for towing, hauling, and comfortable long-distance use, the Sierra 2500HD fits that use case well.

Good and great deals account for 31.8% of listings, so there is some 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, and towing capability. That kind of feedback suggests you can count on it for the core heavy-duty tasks buyers expect from this model.

The expert review also reinforces that sense of durability by describing the truck as built around serious work and capable of handling demanding towing and hauling duties. If you are shopping used, 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 74.3% 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 inspection of the truck’s body, bed, and undercarriage for signs of hard use or repair. Because this is a heavy-duty pickup, you should also focus on how well the truck has been maintained and whether its equipment still works as intended.

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, two-tier trailering mirrors, body-color door handles, tinted glass, stainless steel belt-line moldings, an EZ lift-and-lower tailgate, a 4.2-inch driver-information screen, a 4G LTE WiFi hotspot, cruise control, carpeted floor covering, remote keyless entry, and a leather-wrapped steering wheel. The SLT adds 18-inch aluminum wheels with black accents, LED bed lighting, LED fog lights, chrome door handles and mirror caps, a power-release tailgate, Multi-Pro six-way tailgate, 10-way power-adjustable front seats, wall-style power outlets, and an 8-inch infotainment touchscreen. The Denali adds a full leather interior with wood-grain inserts, chrome exterior details, navigation, wireless device charging, and a Bose premium sound system.
• Powertrain: You get two 6.6-liter V8 options: 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 massive torque, while the gas engine is the simpler route.
• 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 running GMC Infotainment 3 with Apple CarPlay and Android Auto through USB. The SLT and Denali upgrade 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 an observed average of 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 entry point, and it gives you the basics: a V8 engine, a 7-inch touchscreen, Apple CarPlay, and Android Auto. It makes sense if you want the lowest starting price, but the content is sparse enough that many shoppers will want to move up.
• SLE: This is the best-value trim for many buyers because it adds useful everyday and towing upgrades without jumping to luxury pricing. You get 17-inch aluminum wheels, trailering mirrors, an EZ lift-and-lower tailgate, a better driver-information screen, WiFi hotspot capability, cruise control, remote keyless entry, and a leather-wrapped steering wheel.
• SLT: This is the sweet spot if you want a more upscale truck without going all the way to Denali pricing. It adds the 8-inch touchscreen, power-adjustable front seats, LED lighting, power outlets, and the Multi-Pro six-way tailgate, making it a strong blend of comfort and utility.
• Denali: This is the luxury-focused choice, with full leather, wood 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 setup is straightforward: Driver Alert Package I adds 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.

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 are patient and compare listings carefully.

• Deal availability: 31.8% of listings are priced as good or great deals.
• Inventory: There are 1,199 listings available.
• Price trend: Prices have softened 4.64% compared with last year.
• Clean inventory: 74.3% 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 $49,215 sits slightly below last year's $51,607.

That decline suggests the market has eased a bit, which can help you as a buyer today but may also mean future resale gains are more limited if prices keep softening. For a seller, the key takeaway is that condition, trim, and equipment will matter even more when the broader market is moving down.

Because this truck sits in a premium-heavy-duty niche, well-equipped examples can still hold attention from shoppers who want capability and comfort together. 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 is a massive truck, and that size creates real maneuvering challenges, but the available camera system and trailering mirrors help reduce the stress of parking and tight-space driving.

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

Standard safety features include 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.

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:

• 31.8% of listings are priced as good or great deals.
• At 74.3% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 4.64% compared with last year.
• Owners rate it 4.86/5 — a strong satisfaction signal.
• The expert review says it drives great and is loaded with features, but it also calls out poor value for money and cheap-feeling interior materials.

The bottom line: The 2020 Sierra 2500HD makes the most sense if you want heavy-duty capability with a premium-leaning feature set and you are willing to shop carefully for condition and price. If you are especially price-sensitive, a different year may be worth comparing, but the 2020 remains appealing when you find a clean, well-equipped example at the right number.

These recommendations are based on CarGurus' proprietary market data from September 22, 2026, CarGurus experts' opinions, and generative AI.