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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

    $42,698

    164,667 mi.
    Est. $804/mo

    Classic Chevrolet Owasso

    4.2
    Owasso, OK (586 mi)
    Check Availability

  • 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

    $48,552

    109,006 mi.
    Est. $915/mo

    Hardy Superstore

    4.8
    Dallas, GA (572 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

    $44,219

    131,155 mi.
    Est. $833/mo

    Vernon Auto Group

    4.8
    Vernon, TX (829 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

    $48,680

    68,890 mi.
    Est. $917/mo

    Victory Chevrolet

    4.6
    Milan, MI (204 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

    $57,948

    40,645 mi.
    Est. $1,092/mo

    Rick Hendrick Chevrolet of Buford

    4.9
    Buford, GA (573 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

    $53,999

    70,453 mi.
    Est. $1,017/mo

    Veterans Ford

    4.5
    Tampa, FL (999 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

    $49,025

    $970
    54,363 mi.
    Est. $924/mo

    Dan Deery Toyota

    4.9
    Cedar Falls, IA (250 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

    $51,291

    71,958 mi.
    Est. $966/mo

    Bowditch Ford

    4.4
    Newport News, VA (682 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

    $43,366

    $970
    145,380 mi.
    Est. $817/mo

    Phillip Hawkins Motor Company

    Graniteville, SC (657 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

    $59,279

    29,412 mi.
    Est. $1,117/mo

    Rainbow Northshore GMC

    4.7
    Covington, LA (800 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

    $52,500

    $1K
    72,250 mi.
    Est. $989/mo

    John Elway Cadillac of Park Meadows

    4.7
    Lone Tree, 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 AT4

    $48,026

    103,272 mi.
    Est. $905/mo

    Bob Howard Buick GMC

    4.6
    Oklahoma City, OK (686 mi)
    Check Availability
  • 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

    $46,756

    95,788 mi.
    Est. $881/mo

    VanGuard GMC

    4.7
    Sherman, TX (749 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

    $46,887

    $1.3K
    99,260 mi.
    Est. $883/mo

    Hiley Buick GMC of Fort Worth

    4.4
    Fort Worth, TX (832 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

    $42,698

    164,667 mi.
    Est. $804/mo

    Classic Chevrolet Owasso

    4.2
    Owasso, OK (586 mi)
    Check Availability

  • 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

    $48,174

    $2.1K
    110,554 mi.
    Est. $908/mo

    Leesburg Buick GMC

    4.5
    Leesburg, VA (563 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

    $64,356

    37,593 mi.
    Est. $1,212/mo

    Corning Ford

    4.9
    Corning, CA (1,798 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

    $51,086

    52,194 mi.
    Est. $962/mo

    Lake Hartwell Chevrolet

    4.9
    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

    $52,330

    $570
    69,271 mi.
    Est. $986/mo

    Sam Boswell Buick GMC Mt Dora

    4.1
    Mount Dora, FL (963 mi)
    Check Availability
  • 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

    $60,350

    24,381 mi.
    Est. $1,137/mo

    Findlay Chevy GMC Bullhead

    4.7
    Bullhead City, AZ (1,520 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

    $40,698

    156,547 mi.
    Est. $767/mo

    Classic Chevrolet Owasso

    4.2
    Owasso, OK (586 mi)
    Check Availability

  • 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

    $49,480

    $2K
    89,483 mi.
    Est. $932/mo

    Discovery Auto Center, LLC

    4.4
    Tampa, FL (1,000 mi)
    Check Availability
  • 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

    $53,999

    62,710 mi.
    Est. $1,017/mo

    Shottenkirk Fort Bend Kia

    4.8
    Rosenberg, TX (967 mi)
    Check Availability
  • 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

    $40,170

    $955
    150,629 mi.
    Est. $757/mo

    Leshen Auto Sales

    Des Moines, IA (309 mi)
    Check Availability
  • 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

    $49,200

    $1K
    85,642 mi.
    Est. $927/mo

    Elder Chrysler Dodge Jeep Ram

    Athens, TX (806 mi)
    Check Availability
  • 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

    $55,995

    $1.9K
    31,147 mi.
    Est. $1,055/mo

    Unlimited Motors

    Lafayette, IN (112 mi)
    Check Availability
  • 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

    $48,680

    68,890 mi.
    Est. $917/mo

    Victory Chevrolet

    4.6
    Milan, MI (204 mi)
    Check Availability

  • 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

    $42,692

    124,421 mi.
    Est. $804/mo

    Nelson Mazda Norman

    Norman, OK (703 mi)
    Check Availability
  • 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

    $47,337

    $1K
    59,876 mi.
    Est. $892/mo

    Hastings Ford

    3.9
    Hastings, MN (327 mi)
    Check Availability

GMC Sierra 2500 prices by year

Model year Average price Deals
2026 GMC Sierra 2500 AT4 37 Great deals
2025 GMC Sierra 2500 AT4 $68,785 71 Great deals
2024 GMC Sierra 2500 AT4 $64,251 118 Great deals
2023 GMC Sierra 2500 AT4 $55,351 36 Great deals
2022 GMC Sierra 2500 AT4 $52,528 40 Great deals
2020 GMC Sierra 2500 AT4 $46,944 27 Great 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 $49,520, with pricing starting at $36,395.

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)

2021 GMC Sierra 2500 trims