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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

    $53,995

    42,601 mi.
    Est. $1,015/mo

    Bob Johnson Used

    4.0
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    Rochester, NY (519 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

    $51,360

    $1K
    69,732 mi.
    Est. $965/mo

    McGrath Acura of Libertyville

    4.4
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    Libertyville, IL (31 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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  • 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
    Check Availability
    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

    $49,991

    83,951 mi.
    Est. $940/mo

    Quebedeaux Buick GMC

    4.5
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    Tucson, AZ (1,440 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

    77,790 mi.
    Est. $1,053/mo

    Zimbrick Buick GMC Eastside

    4.8
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    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

    $51,888

    $999
    76,196 mi.
    Est. $975/mo

    Mike Rezi Nissan Atlanta

    4.9
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    Atlanta, GA (581 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
    Check Availability
    Pella, IA (277 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

    $48,983

    98,090 mi.
    Est. $921/mo

    Garber Chevrolet Midland

    4.9
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    Midland, MI (211 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
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    Harrisonburg, VA (520 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
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    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

    $55,990

    88,572 mi.
    Est. $1,052/mo

    Southern Buick GMC Greenbrier

    4.0
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    Chesapeake, VA (703 mi)
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  • Cayenne Red 2021 GMC Sierra 2500 AT4Cayenne Red 2021 GMC Sierra 2500 AT4Cayenne Red 2021 GMC Sierra 2500 AT4Cayenne Red 2021 GMC Sierra 2500 AT4Cayenne Red 2021 GMC Sierra 2500 AT4Cayenne Red 2021 GMC Sierra 2500 AT4

    $59,970

    50,025 mi.
    Est. $1,127/mo

    Sullivan Cadillac

    4.6
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    Ocala, FL (932 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

    $51,838

    $2K
    93,061 mi.
    Est. $974/mo

    Freeman Buick GMC

    3.2
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    Grapevine, TX (807 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

    $53,254

    41,232 mi.
    Est. $1,001/mo

    Ellis Chevrolet GMC Buick

    4.5
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    Malone, NY (701 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

    $55,997

    $1.2K
    45,503 mi.
    Est. $1,053/mo

    Lexus of Greenwood Village

    4.3
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    Greenwood Village, CO (916 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 AT4

    $39,995

    142,931 mi.
    Est. $752/mo

    Milnes Chevrolet

    4.3
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    Imlay City, MI (246 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

    $49,599

    107,063 mi.
    Est. $932/mo

    Sid Dillon Buick GMC Fremont

    5.0
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    Fremont, NE (457 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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  • 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

    $48,468

    $1.4K
    80,055 mi.
    Est. $911/mo

    O'Meara GMC

    3.1
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    Thornton, CO (917 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

    $59,900

    47,830 mi.
    Est. $1,126/mo

    Rogers GMC of Hermiston

    4.9
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    Hermiston, OR (1,590 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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  • 2021 GMC Sierra 2500 AT42021 GMC Sierra 2500 AT42021 GMC Sierra 2500 AT42021 GMC Sierra 2500 AT42021 GMC Sierra 2500 AT42021 GMC Sierra 2500 AT4

    $52,399

    $599
    52,490 mi.
    Est. $985/mo

    Walser Mitsubishi - Burnsville

    4.6
    Check Availability
    Burnsville, MN (348 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

    $55,000

    34,021 mi.
    Est. $1,034/mo

    Eide Ford-Lincoln Inc

    4.6
    Check Availability
    Bismarck, ND (732 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

    $54,353

    $361
    73,540 mi.
    Est. $1,022/mo

    Land Rover Downtown Salt Lake

    4.9
    Check Availability
    Salt Lake City, UT (1,257 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 $74,778 18 Great deals
2024 GMC Sierra 2500 AT4 $70,531 6 Great deals
2023 GMC Sierra 2500 AT4 $57,759 35 Great deals
2022 GMC Sierra 2500 AT4 $53,870 30 Great deals
2020 GMC Sierra 2500 AT4 $49,425 27 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 $53,437, with pricing starting at $39,995.

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