2021 GMC Sierra 1500 AT4

  • Used
  • Diesel
Retail Price
$32,997
Savings
-$3,999
Price
$28,998
Admin Fee
$620
Price After Fees
$29,618
Road Ready online buying  

    The overview

    Exterior Color
    Onyx Black
    Interior Color
    JET BLACK WITH KALAHARI ACCENTS, PERFORATED LEATHE
    Odometer
    118,581 miles
    Fuel Economy
    14/19 MPG City/Hwy
    Transmission
    Automatic
    Drivetrain
    4WD
    Engine
    Engine: Duramax 3.0L, Turbo-Diesel, Inline 6 Cylinder
    VIN
    3GTU9EET8MG400364
    Stock Number
    K29009B
      • Max seating capacity: 5
      • Fuel System: Direct Injection
      • Fuel tank capacity: 24 gal
      • Horsepower: 277
      This 2021 GMC Sierra 1500 AT4 combines rugged capability with refined comfort in a truck built for both work and weekend adventures. The Crew Cab Short Box design offers versatile cargo space while maintaining excellent maneuverability, and the striking black exterior with Jet Black interior accented in Kalahari creates a premium aesthetic. Powered by a 3.0L I-6 Diesel Turbocharged engine delivering EPA-estimated 22 city / 26 highway MPG with 10-speed automatic transmission and 4WD, this Sierra handles challenging terrain with confidence. Actual mileage may vary.- Spray-On Pickup Bed Liner w/AT4 Logo- ProGrade Trailering System with Integrated Trailer Brake Controller- 20 Machined Aluminum Wheels with Carbon Grey Metallic Accents- Heated and Ventilated Front Seats with Perforated Leather Trim- Remote Vehicle Starter System with Keyless Open & Start- Power Windows (Front and Rear with Express Controls)- 120-Volt Bed and Instrument Panel Power Outlets- Hill Descent Control and Auto-Locking Rear Differential- 4G LTE Wi-Fi Hotspot and GMC Connected Services Capable- Steering Wheel Audio Controls with SiriusXM and Premium Infotainment SystemThis AT4 is loaded with premium features that elevate everyday driving and serious towing. The Preferred Equipment Group 4SB and Trailering Package deliver comprehensive capability whether you're hauling equipment or exploring backcountry, while the engine block heater and auxiliary transmission oil cooler ensure reliable performance in demanding conditions. With over 118,000 miles, this truck has proven durability and is ready for your next chapter.We invite you to visit our showroom to experience the Sierra 1500 AT4 firsthand and discuss financing options that work for you.

      KBB.com Consumer Reviews

      Kelley Blue Book Logo4.0out of 5 overall
      • 4.0

        Depreciation of 50%

        by Manny A on 10/28/2026 10:06:36 AM

        This is a amazing truck.. Comfortable lots of sensors Etc…. My truck has 30000 miles I when to trade in they offer $46000 I paid $86000 the depreciation is incredible I don’t buy new truck never again.…
      • 5.0

        2021 GMC SLT 4WD SIERRA, Great Truck

        by Ransom1 on 10/15/2026 4:18:42 PM

        This is my 8th truck. This is hands down the very best truck I’ve ever owned. Not only is it the best looking truck on the road I have never had it in the shop except for oil changes and scheduled maintenance. The silver does not show dirt or grime.…
      • 5.0

        Great 4 cylinder truck

        by Steve on 9/23/2026 2:01:15 AM

        I have only pulled a trailer one time and still got 18 mpg down doing 80 down the interstate. Otherwise this vehicle is used for commuting or recreating. I typically get 22-24 mpg driving MT highways to the mountains. The turbo has some spunk for getting up to speed and the five years I've had my truck no complaints.…