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
  • 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
    Check Availability
    Rochester, NY (519 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

    $55,990

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

    Southern Buick GMC Greenbrier

    4.0
    Check Availability
    Chesapeake, VA (703 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

    $57,886

    63,192 mi.
    Est. $1,088/mo

    Cox Chrysler Dodge Jeep Ram

    4.5
    Check Availability
    Burlington, NC (596 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

    $49,580

    $409
    88,467 mi.
    Est. $932/mo

    Huntersville Ford

    4.6
    Check Availability
    Huntersville, NC (578 mi)
    Quick view
  • 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 AT4

    $59,970

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

    Sullivan Cadillac

    4.6
    Check Availability
    Ocala, FL (932 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

    $57,555

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

    Lynn Layton Chevrolet Inc

    4.7
    Check Availability
    Decatur, AL (507 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

    $51,888

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

    Mike Rezi Nissan Atlanta

    4.9
    Check Availability
    Atlanta, GA (581 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

    $51,838

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

    Freeman Buick GMC

    3.2
    Check Availability
    Grapevine, TX (807 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

    $51,993

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

    Mark Kia

    4.1
    Check Availability
    Scottsdale, AZ (1,441 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

    $46,999

    94,170 mi.
    Est. $883/mo

    Basil Toyota

    4.6
    Check Availability
    Lockport, NY (464 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

    $49,991

    83,951 mi.
    Est. $940/mo

    Quebedeaux Buick GMC

    4.5
    Check Availability
    Tucson, AZ (1,440 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

    $52,088

    $330
    69,731 mi.
    Est. $979/mo

    McGrath Acura of Libertyville

    4.4
    Check Availability
    Libertyville, IL (31 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

    $70,000

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

    Steven Toyota

    4.8
    Check Availability
    Harrisonburg, VA (520 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

    $48,983

    98,090 mi.
    Est. $921/mo

    Garber Chevrolet Midland

    4.9
    Check Availability
    Midland, MI (211 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

    $48,995

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

    Carville's Auto Mart

    4.7
    Check Availability
    Grand Junction, CO (1,116 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

    $45,879

    $2K
    115,840 mi.
    Est. $862/mo

    Garber Randall

    4.8
    Check Availability
    Canandaigua, NY (532 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

    $46,925

    $1.8K
    119,652 mi.
    Est. $882/mo

    Napleton's Schaumburg Buick GMC

    4.1
    Check Availability
    Schaumburg, IL (26 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

    $46,490

    91,501 mi.
    Est. $874/mo

    Ulrich Ford Lincoln

    5.0
    Check Availability
    Pella, IA (277 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

    $53,254

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

    Ellis Chevrolet GMC Buick

    4.5
    Check Availability
    Malone, NY (701 mi)
    Quick view
  • 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)
    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

    $58,995

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

    Certified AutoBrokers Inc

    4.8
    Check Availability
    Grand Island, NY (450 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

    $51,499

    87,405 mi.
    Est. $968/mo

    America's Xtreme Auto

    4.0
    Check Availability
    Houston, TX (944 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

    $59,900

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

    Rogers GMC of Hermiston

    4.9
    Check Availability
    Hermiston, OR (1,590 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

    $54,353

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

    Land Rover Downtown Salt Lake

    4.9
    Check Availability
    Salt Lake City, UT (1,257 mi)
    Quick view

GMC Sierra 2500 prices by year

Model year Average price Deals
2026 GMC Sierra 2500 AT4 9 Great deals
2025 GMC Sierra 2500 AT4 $74,836 17 Great deals
2024 GMC Sierra 2500 AT4 $70,507 6 Great deals
2023 GMC Sierra 2500 AT4 $57,724 35 Great deals
2022 GMC Sierra 2500 AT4 $53,976 30 Great deals
2020 GMC Sierra 2500 AT4 $49,461 28 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 $53,486, 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)
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