Used 2020 GMC Sierra 1500 for Sale nearMilwaukee, WI

Compare 2020 GMC Sierra 1500 Trims in Milwaukee, WI

The 2020 GMC Sierra 1500 offers a range of trims from budget-friendly options to luxury models, all featuring 4WD for versatile driving.

• Starting at $27,913
• Best MPG/MPGe: 19 city / 22 hwy
• Most Popular: Denali Crew Cab 4WD

Trim Overview

Prices updated weekly from CarGurus listings.

Quick Compare Table

Listing prices sourced from CarGurus — updated weekly. OEM specs from manufacturer data.

Missing data displayed as "—".

Trim Deep Dives

SLE Double Cab 4WD — "Who It's For"

The SLE Double Cab 4WD is the pick for shoppers who want a solid truck with essential features without paying for luxury upgrades.

• Avg. market price: $31,199 (updated weekly)
• MPG/MPGe: 19 city / 22 hwy
• Inventory: 5 listings — lower availability; may limit negotiating room
• View SLE Double Cab 4WD listings

SLE Crew Cab 4WD — "Who It's For"

The SLE Crew Cab 4WD is the pick for shoppers who want extra passenger space and modern tech features without a hefty price tag.

• Avg. market price: $31,199 (updated weekly)
• MPG/MPGe: 19 city / 22 hwy
• Inventory: 12 listings — lower availability; may limit negotiating room
• View SLE Crew Cab 4WD listings

Elevation Crew Cab 4WD — "Who It's For"

The Elevation Crew Cab 4WD is the pick for shoppers who want a stylish truck with modern tech at an accessible price.

• Avg. market price: $27,913 (updated weekly)
• MPG/MPGe: 19 city / 22 hwy
• Inventory: 49 listings
• View Elevation Crew Cab 4WD listings

SLT Crew Cab 4WD — "Who It's For"

The SLT Crew Cab 4WD is the pick for shoppers who want a blend of luxury and capability without going for the top-tier Denali.

• Avg. market price: $30,462 (updated weekly)
• MPG/MPGe: 16 city / 22 hwy
• Inventory: 52 listings
• View SLT Crew Cab 4WD listings

AT4 Crew Cab 4WD — "Who It's For"

The AT4 Crew Cab 4WD is the pick for shoppers who want off-road capability with added luxury features for a more adventurous lifestyle.

• Avg. market price: $36,291 (updated weekly)
• MPG/MPGe: 16 city / 21 hwy
• Inventory: 56 listings
• View AT4 Crew Cab 4WD listings

Denali Crew Cab 4WD — "Who It's For"

The Denali Crew Cab 4WD is the pick for shoppers who want the ultimate luxury experience in a capable truck, complete with advanced features.

• Avg. market price: $32,004 (updated weekly)
• MPG/MPGe: 16 city / 22 hwy
• Inventory: 73 listings
• View Denali Crew Cab 4WD listings

Trim Recommendations

Most Popular — Denali Crew Cab 4WD

With 73 active listings, the Denali Crew Cab 4WD is the clear volume leader in the lineup.

Browse Denali Crew Cab 4WD listings

Best Budget Option — Elevation Crew Cab 4WD

At $27,913 avg market price — below the lineup median of $31,199 — it's the most accessible entry point.

Browse Elevation Crew Cab 4WD listings

Best for Fuel Economy — SLE Double Cab 4WD

The SLE Double Cab 4WD offers the best fuel economy in the lineup at 19/22 MPG.

Browse SLE Double Cab 4WD listings

These recommendations are based on CarGurus' proprietary market data from November 5, 2026, CarGurus experts' opinions, and generative AI.

How much does the 2020 GMC Sierra 1500 cost?

Prices have softened 8.79% compared to this time last year, making it a favorable time to shop this model year.

There are 6,744 listings available, which suggests solid inventory for comparison shopping.

Is the 2020 GMC Sierra 1500 a good car?

Generally — the 2020 GMC Sierra 1500 earns a 4.3/5 user rating and an 8.3/10 expert rating. The standout strength is Form and function at 10/10.

Owners consistently praise the spacious interior, advanced technology, strong performance, and smooth ride. They also value the variety of options available, which helps the truck fit different needs.

The main trade-offs are that the interior design and features can feel mixed, and some owners reported engine-related frustrations. In practice, that means you should expect a truck that feels versatile and well equipped, especially if you want something that can handle daily driving and worksite duty.

The model’s 34.4% good or great deal share suggests there are still worthwhile listings to find.

Is the 2020 GMC Sierra 1500 reliable?

Owners rate it 4.3/5, a solid signal of long-term satisfaction.

The owner feedback points to a truck that many people have found dependable enough to live with day to day, with praise for its strong performance and the confidence that comes from a well-rounded ownership experience. The review summary also highlights value and the range of available configurations, both of which can matter when you want a truck you can count on over time.

The expert drive notes reinforce that sense of durability by emphasizing the Sierra’s utility-minded design and its ability to serve as both a commuter and a work truck. The AT4’s rugged hardware also suggests a truck built to handle demanding use.

If you’re shopping used, the biggest long-term ownership risk is that some trucks have reported engine-related issues, so condition and maintenance history matter.

What should I look for when buying a used 2020 GMC Sierra 1500?

At 74.4% 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 been used for towing, off-road driving, or heavy work. Focus on signs of wear that could affect ride quality, drivetrain health, and interior condition.

Key things to evaluate:

• Trim level: The Base trim comes with a V6 engine, a 7-inch touchscreen, Apple CarPlay, Android Auto, Bluetooth connectivity, a USB port, and LED headlights. The SLE adds another USB port, a WiFi hotspot, an 8-inch touchscreen, and remote keyless entry, while the Elevation adds heated front seats, remote engine start, and a heated steering wheel. The SLT adds many of those comforts with more classic chrome styling, the AT4 adds off-road-oriented hardware and rugged touches, and the Denali brings the most luxury-focused equipment.
• Powertrain: The Sierra offers five engines, including a 4.3-liter V6, a 2.7-liter turbocharged 4-cylinder, a Duramax turbodiesel 3.0-liter 6-cylinder, a 5.3-liter V8, and a 6.2-liter V8. The lineup gives you a wide spread of power and efficiency, and the AT4’s 6.2-liter V8 is the strongest setup described.
• Safety package: Standard safety features include a reversing camera, traction control, and a full array of front- and side-impact airbags. Available driver-assistance features include forward-collision warning, lane-departure warning, automatic high beams, adaptive cruise control, blind-spot monitoring, lane-keeping assist, rear cross-traffic alert, a surround-view camera, front and rear parking sensors, and the rear camera mirror. Advanced safety features are not standard.
• Infotainment: The Base trim has a 7-inch touchscreen, while the SLE moves to an 8-inch screen. The system includes Apple CarPlay, Android Auto, Bluetooth, and straightforward controls, and the AT4 adds an HUD and wireless charging.
• Fuel efficiency: The AT4 returns 15 mpg city, 19 highway, and 17 combined. The 2.7-liter turbo returns 20/23/21, the turbodiesel with rear-wheel drive returns 23/30/26, and the most efficient V8 is the 5.3-liter with rear-wheel drive at 17/24/20.

Which 2020 GMC Sierra 1500 trim should I buy?

The 2020 GMC Sierra 1500 is offered in 6 trim levels: Base, SLE, Elevation, SLT, Denali, AT4.

Here's the short version:

• Base: This is the entry point if you want the Sierra’s core utility and the standard tech basics without paying for extras. It makes sense if you’re focused on value and can live without the nicer comfort and convenience upgrades.
• SLE: This is the best-value trim for many shoppers because it adds an 8-inch touchscreen, a WiFi hotspot, remote keyless entry, and another USB port. It gives you a more modern daily-driver feel without jumping too far up the price ladder.
• Elevation: Choose this if you want a more distinctive look and more comfort features, including heated front seats, remote engine start, and a heated steering wheel. It’s a good fit if style matters as much as utility.
• SLT: This is the trim CarGurus recommends, and it’s the one to target if you want a more road-friendly setup with many of the comfort features found in the AT4. It’s the most balanced choice if you want capability without the AT4’s rougher ride.
• Denali: Pick this if you want the most luxury-focused Sierra, with features like a head-up display, navigation, wireless device charging, and lots of chrome and larger wheels. It’s the premium choice for shoppers who want a more upscale truck.
• AT4: This is the off-road-oriented trim, with all-terrain tires, red tow hooks, skid plates, upgraded suspension components, hill-descent control, and Rancho off-road shocks. It suits you best if you want rugged capability and don’t mind a rougher on-road ride.

Advanced safety features are not standard, so check equipment carefully on any trim you’re considering.

Is now a good time to buy a used 2020 GMC Sierra 1500?

This is a moderate market for selective buyers, with enough inventory and deal activity to make comparison shopping worthwhile.

• Deal availability: 34.4% of listings are priced as good or great deals.
• Inventory: There are 6,744 listings available.
• Price trend: Prices have softened 8.79% compared with last year.
• Clean inventory: 74.4% of listings are accident-free.

If you find a listing below $32,413, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2020 GMC Sierra 1500's resale value?

The current average of $32,413 sits slightly below last year's $35,535.

That softer pricing can help you as a buyer now, but it also means future sellers may face a more competitive resale environment if prices keep easing. If you buy at the right number and keep the truck in strong condition, you’ll be better positioned to protect value later.

The Sierra’s broad appeal helps, though, because shoppers still respond to its comfort, capability, and technology. Trucks with strong owner satisfaction tend to stay in demand, which supports resale value over time.

Vehicles with solid owner satisfaction ratings, like this model year's 4.3/5, tend to retain buyer demand, which supports resale value over time.

Is the 2020 GMC Sierra 1500 safe?

The 2020 GMC Sierra 1500 earns an 8/10 safety score from our experts.

Standard safety features include a reversing camera, traction control, and a full array of front- and side-impact airbags. Available driver-assistance features include forward-collision warning, lane-departure warning, automatic high beams, adaptive cruise control, blind-spot monitoring, lane-keeping assist, rear cross-traffic alert, a surround-view camera, front and rear parking sensors, and the rear camera mirror.

Advanced safety features are not standard, so you’ll want to verify exactly what’s included on any used example you’re considering.

Should I buy a 2020 GMC Sierra 1500 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:

• 34.4% of listings are priced as good or great deals.
• At 74.4% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 8.79% compared with last year.
• Owners rate it 4.3/5 — a solid satisfaction signal.
• It blends pickup utility with SUV-like comfort and easy-to-use technology.

Consider the 2019 if:

• At $30,654, the 2019 costs less than the current year's $32,413 average.
• It was completely redesigned and improved across the board.

Consider the 2021 if:

• At $33,923, the 2021 costs more than the current year's $32,413 average.
• It adds unique features like an optional carbon-fiber composite cargo bed.

The bottom line: The 2020 is the right pick if you want a well-rounded Sierra with strong comfort, capability, and a softer market price than the 2021. If you’re especially price-sensitive, the 2019 is the value play, while the 2021 makes sense if you want the newer-year feature set.

How does the 2020 GMC Sierra 1500 compare to the 2020 Chevrolet Silverado 1500?

Expert Pros & Cons (per CarGurus review team)

2020 GMC Sierra 1500:

• Pros: Multiple powertrain options, Easy-to-use technology.
• Cons: Advanced safety features are not standard.

2020 Chevrolet Silverado 1500:

• Pros: Multiple powertrain options, Comfortable.
• Cons: Advanced safety features are not standard, Poor value for money.

Our experts score the 2020 GMC Sierra 1500 8.3/10 and the 2020 Chevrolet Silverado 1500 7.2/10. The Sierra comes out ahead on expert score and offers the same engine and fuel-economy figures as the Silverado in this comparison. The Silverado is cheaper to buy and has more listings, but the Sierra’s stronger value signal and easier-to-use tech make it the more appealing pick for many shoppers.

Read our full side-by-side expert comparison here.

These recommendations are based on CarGurus' proprietary market data from November 3, 2026, CarGurus experts' opinions, and generative AI.