Skip to main content
Best match Lowest price Highest price Lowest mileage Highest mileage Nearest location Best deal Newest year Oldest year Newest listed Oldest listed
Skip to Filters
  • 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

    $55,348

    $1K
    63,392 mi.
    Est. $983/mo

    Walser Polar Chevrolet

    4.3
    Check Availability
    White Bear Lake, MN (349 mi)

    Quick view
  • 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

    $59,084

    $7K
    48,937 mi.
    Est. $1,049/mo

    DeFOUW BMW Chevrolet

    4.1
    Check Availability
    Lafayette, IN (110 mi)

    Quick view
  • 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

    $45,554

    94,170 mi.
    Est. $809/mo

    Basil Toyota

    4.6
    Check Availability
    Lockport, NY (464 mi)
    Quick view
  • 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

    $57,804

    51,185 mi.
    Est. $1,026/mo

    Zeigler GMC of Holland

    4.8
    Check Availability
    Holland, MI (103 mi)
    Quick view
  • 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

    $48,731

    $2.2K
    98,385 mi.
    Est. $865/mo

    Tameron Hyundai

    4.7
    Check Availability
    Birmingham, AL (588 mi)
    Quick view
  • 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

    $52,626

    $972
    84,490 mi.
    Est. $934/mo

    Liberty Buick

    4.8
    Check Availability
    Peoria, AZ (1,454 mi)
    Quick view
  • 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

    $52,320

    76,196 mi.
    Est. $929/mo

    Nissan of Cookeville

    4.9
    Check Availability
    Cookeville, TN (414 mi)
    Quick view
  • Summit White 2021 GMC Sierra 2500 AT4

    $59,765

    46,306 mi.
    Est. $1,061/mo

    Don Davis Nissan

    4.5
    Check Availability
    Arlington, TX (821 mi)

    Quick view
  • 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

    $59,489

    $505
    47,885 mi.
    Est. $1,056/mo

    AutoNation Toyota Weston

    4.7
    Check Availability
    Davie, FL (1,169 mi)
    Quick view
  • 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 AT4

    $51,255

    $1.2K
    110,873 mi.
    Est. $910/mo

    Sullivan Buick GMC Truck

    4.5
    Check Availability
    Ocala, FL (932 mi)
    Quick view
  • 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

    48,826 mi.
    Est. $976/mo

    Unlimited Motors Fishers

    4.0
    Check Availability
    Fishers, IN (159 mi)
    Quick view
  • 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

    $53,741

    $820
    72,105 mi.
    Est. $954/mo

    Indy Auto Man - Westfield

    4.4
    Check Availability
    Westfield, IN (150 mi)
    Quick view
  • 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

    $49,995

    100,817 mi.
    Est. $888/mo

    Carsandpickups.com of Dallas

    4.6
    Check Availability
    Addison, TX (796 mi)
    Quick view
  • 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

    $45,547

    105,823 mi.
    Est. $809/mo

    Albrecht Buick GMC of Wakefield

    4.1
    Check Availability
    Wakefield, MA (847 mi)
    Quick view
  • 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

    $49,886

    $1.3K
    101,127 mi.
    Est. $886/mo

    Landers McLarty Chevrolet

    4.7
    Check Availability
    Huntsville, AL (497 mi)
    Quick view
  • 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

    $51,630

    72,316 mi.
    Est. $917/mo

    101 AUTO OUTLET

    4.0
    Check Availability
    Scottsdale, AZ (1,445 mi)
    Quick view
  • 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

    $55,498

    52,194 mi.
    Est. $985/mo

    Lake Hartwell Chevrolet

    4.9
    Check Availability
    Toccoa, GA (558 mi)
    Quick view
  • 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

    $54,337

    59,876 mi.
    Est. $965/mo

    Hastings Ford

    4.0
    Check Availability
    Hastings, MN (327 mi)
    Quick view
  • 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

    $53,215

    88,151 mi.
    Est. $945/mo

    Steve Schmitt of Litchfield

    4.6
    Check Availability
    Litchfield, IL (216 mi)
    Quick view
  • 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

    $45,586

    $304
    112,056 mi.
    Est. $809/mo

    Extreme Chrysler Dodge Jeep RAM

    4.7
    Check Availability
    Jackson, MI (170 mi)
    Quick view
  • 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

    $51,000

    77,790 mi.
    Est. $906/mo

    Zimbrick Buick GMC Eastside

    Check Availability
    Madison, WI (121 mi)
    Quick view
  • 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

    $52,861

    62,917 mi.
    Est. $939/mo

    Richland Chrysler Dodge Jeep Ram

    Check Availability
    Roswell, NM (1,092 mi)
    Quick view
  • 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

    $54,999

    $299
    85,656 mi.
    Est. $977/mo

    Schwan Buick GMC

    Check Availability
    Mandan, ND (735 mi)
    Quick view
  • 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

    $41,174

    $592
    169,182 mi.
    Est. $731/mo

    Lakeside Huntington Chevrolet

    3.8
    Check Availability
    Huntington, IN (130 mi)
    Quick view
  • 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

    $58,695

    $300
    41,164 mi.
    Est. $1,042/mo

    Mauer Main Chevrolet

    3.7
    Check Availability
    Anoka, MN (369 mi)
    Quick view

GMC Sierra 2500 prices by year

Model year Average price Deals
2026 GMC Sierra 2500 AT4 12 Great deals
2025 GMC Sierra 2500 AT4 $74,140 41 Great deals
2024 GMC Sierra 2500 AT4 $69,793 76 Great deals
2023 GMC Sierra 2500 AT4 $58,742 15 Great deals
2022 GMC Sierra 2500 AT4 $54,396 14 Great deals
2020 GMC Sierra 2500 AT4 $51,216 9 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 $51,959, with pricing starting at $39,499.

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)
Skip to Listings
Best match Lowest price Highest price Lowest mileage Highest mileage Nearest location Best deal Newest year Oldest year Newest listed Oldest listed

GMC Sierra 2500 trims