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  • Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4

    $52,418

    69,728 mi.
    Est. $985/mo

    McGrath Acura of Libertyville

    4.4
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    Libertyville, IL (31 mi)

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  • Brownstone Metallic 2021 GMC Sierra 2500 AT4Brownstone Metallic 2021 GMC Sierra 2500 AT4Brownstone Metallic 2021 GMC Sierra 2500 AT4Brownstone Metallic 2021 GMC Sierra 2500 AT4Brownstone Metallic 2021 GMC Sierra 2500 AT4Brownstone Metallic 2021 GMC Sierra 2500 AT4

    $46,490

    91,501 mi.
    Est. $874/mo

    Ulrich Ford Lincoln

    5.0
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    Pella, IA (277 mi)

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  • Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4

    $48,979

    $985
    92,480 mi.
    Est. $921/mo

    Bill Utter Ford

    4.8
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    Denton, TX (793 mi)
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  • Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4

    $52,488

    $399
    76,196 mi.
    Est. $987/mo

    Mike Rezi Nissan Atlanta

    4.9
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    Atlanta, GA (581 mi)
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  • Pacific Blue Metallic 2021 GMC Sierra 2500 AT4Pacific Blue Metallic 2021 GMC Sierra 2500 AT4Pacific Blue Metallic 2021 GMC Sierra 2500 AT4Pacific Blue Metallic 2021 GMC Sierra 2500 AT4Pacific Blue Metallic 2021 GMC Sierra 2500 AT4Pacific Blue Metallic 2021 GMC Sierra 2500 AT4

    $56,000

    77,789 mi.
    Est. $1,053/mo

    Zimbrick Buick GMC Eastside

    4.8
    Check Availability
    Madison, WI (121 mi)
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  • Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4

    $57,555

    44,036 mi.
    Est. $1,082/mo

    Lynn Layton Chevrolet Inc

    4.7
    Check Availability
    Decatur, AL (507 mi)
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  • Ebony Twilight Metallic 2021 GMC Sierra 2500 AT4Ebony Twilight Metallic 2021 GMC Sierra 2500 AT4Ebony Twilight Metallic 2021 GMC Sierra 2500 AT4Ebony Twilight Metallic 2021 GMC Sierra 2500 AT4Ebony Twilight Metallic 2021 GMC Sierra 2500 AT4Ebony Twilight Metallic 2021 GMC Sierra 2500 AT4

    $57,995

    85,662 mi.
    Est. $1,090/mo

    All American Chevrolet Of Midland

    4.5
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    Midland, TX (1,051 mi)
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  • Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4

    $50,518

    $1.4K
    80,055 mi.
    Est. $950/mo

    O'Meara GMC

    3.1
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    Thornton, CO (917 mi)

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  • Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4

    $51,993

    $4.9K
    89,157 mi.
    Est. $977/mo

    Mark Kia

    4.1
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    Scottsdale, AZ (1,441 mi)
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  • Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4

    $55,953

    $500
    70,735 mi.
    Est. $1,052/mo

    Perrysburg Automall

    4.6
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    Perrysburg, OH (208 mi)
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  • Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4

    $46,499

    $1K
    112,579 mi.
    Est. $874/mo

    McMullen Ford

    4.8
    Check Availability
    Council Bluffs, IA (427 mi)
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  • Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4

    $48,995

    $1K
    119,523 mi.
    Est. $921/mo

    Carville's Auto Mart

    4.7
    Check Availability
    Grand Junction, CO (1,116 mi)
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  • Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4

    $70,000

    66,163 mi.
    Est. $1,316/mo

    Steven Toyota

    4.8
    Check Availability
    Harrisonburg, VA (520 mi)
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  • Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4

    $52,909

    88,572 mi.
    Est. $995/mo

    Southern Buick GMC Greenbrier

    4.0
    Check Availability
    Chesapeake, VA (703 mi)

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  • Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4

    $48,950

    77,630 mi.
    Est. $920/mo

    Bommarito Ford

    4.6
    Check Availability
    Hazelwood, MO (258 mi)
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  • Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4

    $51,499

    87,405 mi.
    Est. $968/mo

    America's Xtreme Auto

    4.0
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    Houston, TX (944 mi)
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  • Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4

    $50,993

    $599
    80,779 mi.
    Est. $958/mo

    Camp County Chrysler Dodge Jeep Ram

    4.4
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    Pittsburg, TX (732 mi)
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  • Pacific Blue Metallic 2021 GMC Sierra 2500 AT4Pacific Blue Metallic 2021 GMC Sierra 2500 AT4Pacific Blue Metallic 2021 GMC Sierra 2500 AT4Pacific Blue Metallic 2021 GMC Sierra 2500 AT4Pacific Blue Metallic 2021 GMC Sierra 2500 AT4Pacific Blue Metallic 2021 GMC Sierra 2500 AT4

    $60,990

    59,273 mi.
    Est. $1,146/mo

    Country Diesels

    4.7
    Check Availability
    Warrenton, VA (564 mi)
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  • Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4

    $48,250

    $1.5K
    92,560 mi.
    Est. $907/mo

    Weirs Motor Sales, Inc.

    4.2
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    Arundel, ME (876 mi)
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  • Brownstone Metallic 2021 GMC Sierra 2500 AT4Brownstone Metallic 2021 GMC Sierra 2500 AT4Brownstone Metallic 2021 GMC Sierra 2500 AT4Brownstone Metallic 2021 GMC Sierra 2500 AT4Brownstone Metallic 2021 GMC Sierra 2500 AT4Brownstone Metallic 2021 GMC Sierra 2500 AT4

    $53,838

    93,061 mi.
    Est. $1,012/mo

    Freeman Buick GMC

    3.2
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    Grapevine, TX (807 mi)

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  • Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4

    $57,288

    45,316 mi.
    Est. $1,077/mo

    Lexus of Greenwood Village

    4.3
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    Greenwood Village, CO (916 mi)
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  • Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4

    $54,714

    73,091 mi.
    Est. $1,028/mo

    Land Rover Downtown Salt Lake

    4.8
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    Salt Lake City, UT (1,257 mi)
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  • Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4

    $48,795

    $200
    119,652 mi.
    Est. $917/mo

    Napleton's Schaumburg Buick GMC

    4.1
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    Schaumburg, IL (26 mi)
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  • Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4Onyx Black 2021 GMC Sierra 2500 AT4

    $52,867

    94,108 mi.
    Est. $994/mo

    George Coleman Ford

    4.4
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    Travelers Rest, SC (555 mi)
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  • Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4Summit White 2021 GMC Sierra 2500 AT4

    $58,995

    33,351 mi.
    Est. $1,109/mo

    Certified AutoBrokers Inc

    4.8
    Check Availability
    Grand Island, NY (450 mi)
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  • Cayenne Red Tintcoat 2021 GMC Sierra 2500 AT4Cayenne Red Tintcoat 2021 GMC Sierra 2500 AT4Cayenne Red Tintcoat 2021 GMC Sierra 2500 AT4Cayenne Red Tintcoat 2021 GMC Sierra 2500 AT4Cayenne Red Tintcoat 2021 GMC Sierra 2500 AT4Cayenne Red Tintcoat 2021 GMC Sierra 2500 AT4

    $42,888

    138,547 mi.
    Est. $806/mo

    Sapaugh GM Country

    4.8
    Check Availability
    Herculaneum, MO (291 mi)

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  • Cayenne Red Tintcoat 2021 GMC Sierra 2500 AT4Cayenne Red Tintcoat 2021 GMC Sierra 2500 AT4Cayenne Red Tintcoat 2021 GMC Sierra 2500 AT4Cayenne Red Tintcoat 2021 GMC Sierra 2500 AT4Cayenne Red Tintcoat 2021 GMC Sierra 2500 AT4Cayenne Red Tintcoat 2021 GMC Sierra 2500 AT4

    $53,154

    41,232 mi.
    Est. $999/mo

    Ellis Chevrolet GMC Buick

    4.5
    Check Availability
    Malone, NY (701 mi)
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GMC Sierra 2500 prices by year

Model year Average price Deals
2026 GMC Sierra 2500 AT4 9 Great deals
2025 GMC Sierra 2500 AT4 $75,027 22 Great deals
2024 GMC Sierra 2500 AT4 $70,730 6 Great deals
2023 GMC Sierra 2500 AT4 $57,103 26 Great deals
2022 GMC Sierra 2500 AT4 $54,389 37 Great deals
2020 GMC Sierra 2500 AT4 $48,895 25 Good deals

About the 2021 GMC Sierra 2500 AT4

Basics

AT4 shown.

Seating
5
Door count
4
Drivetrain
Four Wheel Drive
Combined MPG
0
Transmission
6-Speed A/T
Engine
445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel)
Side view of the 2021 GMC Sierra 2500 AT4
FAQs

How much does the 2021 GMC Sierra 2500 AT4 cost?

The 2021 GMC Sierra 2500 AT4 price depends on several factors, including optional features, mileage, vehicle history and location. The nationwide average price for a 2021 Sierra 2500 AT4 is $53,341, with pricing starting at $29,995.

What are some similar vehicles and competitors of the 2021 GMC Sierra 2500 AT4?

The 2021 GMC Sierra 2500 AT4 compares to and/or competes against the following vehicles:


Is the 2021 GMC Sierra 2500 AT4 reliable?

The 2021 GMC Sierra 2500 has an average reliability rating of 4 out of 5 according to Cars.com consumers. Find real-world reliability insights within consumer reviews from 2021 Sierra 2500 owners.

Ratings (29 reviews)

75% of drivers recommend this car

Rating breakdown (out of 5):
Comfort
4.7
Interior
4.6
Performance
4.3
Value
3.9
Exterior
4.6
Reliability
4.0
Trims

AT4 (2 styles)

Style
4WD Crew Cab 172" AT4 4WD Crew Cab 159" AT4
Inventory price
Starting at $59,300 Starting at $59,100
Combined MPG
0 0
Engine
445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel)
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GMC Sierra 2500 trims