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  • Cayenne Red Tintcoat 2021 GMC Sierra 2500 SLTCayenne Red Tintcoat 2021 GMC Sierra 2500 SLTCayenne Red Tintcoat 2021 GMC Sierra 2500 SLTCayenne Red Tintcoat 2021 GMC Sierra 2500 SLTCayenne Red Tintcoat 2021 GMC Sierra 2500 SLTCayenne Red Tintcoat 2021 GMC Sierra 2500 SLT

    $48,876

    $448
    102,255 mi.
    Est. $868/mo

    Walt Massey Chevrolet GMC Lucedale

    4.8
    Lucedale, MS (759 mi)
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  • White Frost Tri-Coat 2021 GMC Sierra 2500 SLTWhite Frost Tri-Coat 2021 GMC Sierra 2500 SLTWhite Frost Tri-Coat 2021 GMC Sierra 2500 SLTWhite Frost Tri-Coat 2021 GMC Sierra 2500 SLTWhite Frost Tri-Coat 2021 GMC Sierra 2500 SLTWhite Frost Tri-Coat 2021 GMC Sierra 2500 SLT

    $54,696

    51,509 mi.
    Est. $971/mo

    Auto Gallery Chevrolet GMC, Inc.

    4.9
    LaGrange, GA (628 mi)
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  • Summit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLT

    $47,149

    75,079 mi.
    Est. $837/mo

    Bob Howard Chevrolet

    4.5
    Oklahoma City, OK (686 mi)
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  • Cayenne Red Tintcoat 2021 GMC Sierra 2500 SLTCayenne Red Tintcoat 2021 GMC Sierra 2500 SLTCayenne Red Tintcoat 2021 GMC Sierra 2500 SLTCayenne Red Tintcoat 2021 GMC Sierra 2500 SLTCayenne Red Tintcoat 2021 GMC Sierra 2500 SLTCayenne Red Tintcoat 2021 GMC Sierra 2500 SLT

    $47,219

    94,875 mi.
    Est. $838/mo

    Jimmy Britt Chrysler Jeep Dodge RAM

    4.5
    Statesboro, GA (729 mi)
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  • Onyx Black 2021 GMC Sierra 2500 SLTOnyx Black 2021 GMC Sierra 2500 SLTOnyx Black 2021 GMC Sierra 2500 SLTOnyx Black 2021 GMC Sierra 2500 SLTOnyx Black 2021 GMC Sierra 2500 SLTOnyx Black 2021 GMC Sierra 2500 SLT

    $42,804

    $947
    98,326 mi.
    Est. $760/mo

    Zeigler Lincoln of Kalamazoo

    4.0
    Kalamazoo, MI (106 mi)
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  • Summit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLT

    $36,127

    $1K
    180,132 mi.
    Est. $641/mo

    Lipscomb Auto Center

    4.9
    Bowie, TX (802 mi)
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  • Ebony Twilight Metallic 2021 GMC Sierra 2500 SLTEbony Twilight Metallic 2021 GMC Sierra 2500 SLTEbony Twilight Metallic 2021 GMC Sierra 2500 SLTEbony Twilight Metallic 2021 GMC Sierra 2500 SLTEbony Twilight Metallic 2021 GMC Sierra 2500 SLTEbony Twilight Metallic 2021 GMC Sierra 2500 SLT

    $49,675

    57,595 mi.
    Est. $882/mo

    Lupient Buick GMC

    4.0
    Golden Valley, MN (359 mi)
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  • Pacific Blue Metallic 2021 GMC Sierra 2500 SLTPacific Blue Metallic 2021 GMC Sierra 2500 SLTPacific Blue Metallic 2021 GMC Sierra 2500 SLTPacific Blue Metallic 2021 GMC Sierra 2500 SLTPacific Blue Metallic 2021 GMC Sierra 2500 SLTPacific Blue Metallic 2021 GMC Sierra 2500 SLT

    $50,498

    80,376 mi.
    Est. $897/mo

    Roberts Toyota

    4.0
    Columbia, TN (433 mi)
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  • Summit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLT

    $53,180

    50,342 mi.
    Est. $944/mo

    Cronin Hillsdale Chrysler Dodge Jeep Ram

    4.0
    Hillsdale, MI (154 mi)
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  • Summit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLT

    $43,950

    $1K
    175,514 mi.
    Est. $780/mo

    Vitali Auto Exchange

    Johnson City, NY (600 mi)
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  • Summit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLT

    $41,000

    102,749 mi.
    Est. $728/mo

    Silo Auto Sales

    Gilbert, AZ (1,442 mi)
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  • Onyx Black 2021 GMC Sierra 2500 SLTOnyx Black 2021 GMC Sierra 2500 SLTOnyx Black 2021 GMC Sierra 2500 SLTOnyx Black 2021 GMC Sierra 2500 SLTOnyx Black 2021 GMC Sierra 2500 SLTOnyx Black 2021 GMC Sierra 2500 SLT

    $38,990

    119,731 mi.
    Est. $692/mo

    Certified Used Cars by Pollard

    Lubbock, TX (968 mi)
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  • Pacific Blue Metallic 2021 GMC Sierra 2500 SLTPacific Blue Metallic 2021 GMC Sierra 2500 SLTPacific Blue Metallic 2021 GMC Sierra 2500 SLTPacific Blue Metallic 2021 GMC Sierra 2500 SLTPacific Blue Metallic 2021 GMC Sierra 2500 SLTPacific Blue Metallic 2021 GMC Sierra 2500 SLT

    $44,620

    80,928 mi.
    Est. $792/mo

    Rice Buick - GMC Inc.

    3.9
    Knoxville, TN (455 mi)
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  • White 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLT

    $30,995

    157,197 mi.
    Est. $550/mo

    JKB Auto Sales

    3.5
    Blue Springs, MO (402 mi)
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  • White 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLT

    $36,949

    $200
    154,857 mi.
    Est. $656/mo

    Dave Syverson Auto Center

    4.9
    Albert Lea, MN (314 mi)
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  • White 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLTWhite 2021 GMC Sierra 2500 SLT

    $42,675

    $495
    87,591 mi.
    Est. $758/mo

    Romeo Ford of Kingston

    4.1
    Kingston, NY (699 mi)
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  • Summit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLT

    $53,494

    56,310 mi.
    Est. $950/mo

    Robert Brogden's Hays GMC

    4.7
    Hays, KS (649 mi)
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  • Summit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLT

    $52,985

    59,643 mi.
    Est. $941/mo

    Bill Dodge GMC Buick

    4.5
    Westbrook, ME (885 mi)
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  • Summit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLT

    $38,579

    169,735 mi.
    Est. $685/mo

    Ferguson Superstore

    4.9
    Broken Arrow, OK (594 mi)
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  • Quicksilver Metallic 2021 GMC Sierra 2500 SLTQuicksilver Metallic 2021 GMC Sierra 2500 SLTQuicksilver Metallic 2021 GMC Sierra 2500 SLTQuicksilver Metallic 2021 GMC Sierra 2500 SLTQuicksilver Metallic 2021 GMC Sierra 2500 SLTQuicksilver Metallic 2021 GMC Sierra 2500 SLT

    $51,624

    $400
    69,284 mi.
    Est. $917/mo

    Cheap Chevrolet

    Flemingsburg, KY (315 mi)
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  • Summit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLT

    $46,894

    85,070 mi.
    Est. $833/mo

    CarLink

    3.1
    Morristown, NJ (687 mi)
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  • Summit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLT

    $40,507

    $100
    101,472 mi.
    Est. $719/mo

    Feldman Chevrolet of Highland

    3.7
    Highland, MI (210 mi)
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  • Blue 2021 GMC Sierra 2500 SLTBlue 2021 GMC Sierra 2500 SLTBlue 2021 GMC Sierra 2500 SLTBlue 2021 GMC Sierra 2500 SLTBlue 2021 GMC Sierra 2500 SLTBlue 2021 GMC Sierra 2500 SLT

    $41,200

    $225
    97,218 mi.
    Est. $732/mo

    Callahan Motor Company

    3.0
    Keller, TX (813 mi)
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  • Summit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLTSummit White 2021 GMC Sierra 2500 SLT

    $47,173

    $824
    88,477 mi.
    Est. $838/mo

    Chevrolet of Wooster

    3.0
    Wooster, OH (304 mi)
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GMC Sierra 2500 prices by year

Model year Average price Deals
2026 GMC Sierra 2500 SLT 5 Great deals
2025 GMC Sierra 2500 SLT $67,272 12 Great deals
2024 GMC Sierra 2500 SLT $62,337 9 Great deals
2023 GMC Sierra 2500 SLT $53,717 5 Great deals
2022 GMC Sierra 2500 SLT $46,319 7 Good deals
2020 GMC Sierra 2500 SLT $44,650 7 Great deals
2019 GMC Sierra 2500 SLT $41,330 13 Good deals
2018 GMC Sierra 2500 SLT $37,487 16 Good deals
2017 GMC Sierra 2500 SLT $34,009 5 Good deals

About the 2021 GMC Sierra 2500 SLT

Basics

SLT shown.

Seating
5
Door count
4
Drivetrain
Rear 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 SLT
FAQs

How much does the 2021 GMC Sierra 2500 SLT cost?

The 2021 GMC Sierra 2500 SLT price depends on several factors, including optional features, mileage, vehicle history and location. The nationwide average price for a 2021 Sierra 2500 SLT is $46,247, with pricing starting at $30,995.

What are some similar vehicles and competitors of the 2021 GMC Sierra 2500 SLT?

The 2021 GMC Sierra 2500 SLT compares to and/or competes against the following vehicles:


Is the 2021 GMC Sierra 2500 SLT 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

SLT (8 styles)

Style
4WD Double Cab 162" SLT 2WD Double Cab 149" SLT 2WD Double Cab 162" SLT 4WD Double Cab 149" SLT 4WD Crew Cab 159" SLT 2WD Crew Cab 159" SLT 2WD Crew Cab 172" SLT 4WD Crew Cab 172" SLT
Inventory price
Starting at $54,600 Starting at $51,600 Starting at $51,800 Starting at $54,400 Starting at $56,200 Starting at $53,400 Starting at $53,600 Starting at $56,400
Combined MPG
0 0 0 0 0 0 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) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 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