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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

    $54,220

    79,654 mi.
    Est. $1,019/mo

    AutoNation USA Austin

    4.1
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    Austin, TX (967 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

    3.9
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    Chesapeake, VA (703 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

    $49,990

    $1K
    94,424 mi.
    Est. $940/mo

    Fresno Buick GMC

    3.9
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    Fresno, CA (1,743 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 AT4

    $42,455

    156,498 mi.
    Est. $798/mo

    Tom Clark Buick GMC

    4.8
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    Denton, TX (794 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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  • 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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  • 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

    $60,855

    50,025 mi.
    Est. $1,144/mo

    Sullivan Cadillac

    4.6
    Check Availability
    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

    $51,338

    $500
    93,061 mi.
    Est. $965/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

    $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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  • 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

    $47,995

    $1K
    119,523 mi.
    Est. $902/mo

    Carville's Auto Mart

    4.7
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    Grand Junction, CO (1,116 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
    Check Availability
    Midland, MI (211 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

    34,051 mi.
    Est. $1,034/mo

    Eide Ford-Lincoln Inc

    4.6
    Check Availability
    Bismarck, ND (732 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

    $53,495

    $500
    42,601 mi.
    Est. $1,006/mo

    Bob Johnson Used

    4.0
    Check Availability
    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

    $51,499

    87,405 mi.
    Est. $968/mo

    America's Xtreme Auto

    4.0
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    Houston, TX (944 mi)
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  • Black 2021 GMC Sierra 2500 AT4Black 2021 GMC Sierra 2500 AT4Black 2021 GMC Sierra 2500 AT4Black 2021 GMC Sierra 2500 AT4Black 2021 GMC Sierra 2500 AT4Black 2021 GMC Sierra 2500 AT4

    $60,998

    $1K
    42,666 mi.
    Est. $1,147/mo

    CarMax West Broad

    Check Availability
    Glen Allen, VA (608 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

    $49,999

    $1.5K
    80,779 mi.
    Est. $940/mo

    Camp County Chrysler Dodge Jeep Ram

    4.4
    Check Availability
    Pittsburg, TX (732 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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  • 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

    $57,035

    $725
    66,961 mi.
    Est. $1,072/mo

    Tasca Buick GMC Melbourne

    4.8
    Check Availability
    Melbourne, FL (1,032 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

    $55,500

    $400
    67,263 mi.
    Est. $1,043/mo

    STG Auto Group of Bellflower

    2.5
    Check Availability
    Bellflower, CA (1,743 mi)

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  • White 2021 GMC Sierra 2500 AT4White 2021 GMC Sierra 2500 AT4White 2021 GMC Sierra 2500 AT4White 2021 GMC Sierra 2500 AT4White 2021 GMC Sierra 2500 AT4White 2021 GMC Sierra 2500 AT4

    $54,987

    59,876 mi.
    Est. $1,034/mo

    Hastings Ford

    4.0
    Check Availability
    Hastings, MN (327 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

    $57,220

    52,194 mi.
    Est. $1,076/mo

    Lake Hartwell Chevrolet

    4.9
    Check Availability
    Toccoa, GA (558 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

    $59,911

    $1K
    59,273 mi.
    Est. $1,126/mo

    Country Diesels

    4.7
    Check Availability
    Warrenton, VA (564 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

    $58,950

    68,080 mi.
    Est. $1,108/mo

    Hardy Chevrolet Gainesville

    4.8
    Check Availability
    Gainesville, GA (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

    $44,915

    $2.9K
    115,840 mi.
    Est. $844/mo

    Garber Randall

    4.8
    Check Availability
    Canandaigua, NY (532 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

    $54,995

    51,108 mi.
    Est. $1,034/mo

    Bierlein Moore Chevrolet

    4.9
    Check Availability
    Sebewaing, MI (248 mi)
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GMC Sierra 2500 prices by year

Model year Average price Deals
2026 GMC Sierra 2500 AT4 6 Great deals
2025 GMC Sierra 2500 AT4 $74,877 20 Great deals
2024 GMC Sierra 2500 AT4 $70,554 7 Great deals
2023 GMC Sierra 2500 AT4 $57,986 26 Great deals
2022 GMC Sierra 2500 AT4 $54,034 29 Great deals
2020 GMC Sierra 2500 AT4 $50,095 22 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 $53,900, with pricing starting at $39,997.

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