2021 GMC Sierra 1500 SLT

  • Used
  • Diesel
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    The overview

    Exterior Color
    Summit White
    Interior Color
    JET BLACK
    Odometer
    112,485 miles
    Fuel Economy
    14/20 MPG City/Hwy
    Transmission
    10-Speed Automatic
    Drivetrain
    4WD
    Engine
    Engine: Duramax 3.0L, Turbo-Diesel, Inline 6 Cylinder
    Bed Length
    5.8 ft
    VIN
    3GTU9DET7MG266344
    Stock Number
    12028C
    • Show Me the CARFAX 1-Owner Badge

    A closer look at what’s included

    SLT Premium Plus Package

    • SLT Convenience Package
    • SLT Preferred Package
    • Driver Alert Package I
    • Driver Alert Package II

    SLT Convenience Package

    • Front Bucket Seats
      Includes center console.
    • Floor-Mounted Center Console
      Includes cup holders, cell phone storage, power cord management and hanging file holder capability.
    • Ventilated Driver & Front Passenger Seats
    • Power Sliding Rear Window w/Rear Defogger

    Driver Alert Package II

    • Forward Collision Alert
    • Lane Keep Assist w/Lane Departure Warning
    • Automatic Emergency Braking
    • Front Pedestrian Braking

    SLT Preferred Package

    • Radio: Premium GMC Infotainment Sys w/Navigation
      Includes 8" diagonal color touch-screen, multi-touch display, AM/FM stereo, Bluetooth streaming audio for music and most phones; featuring wireless Android Auto and Apple CarPlay capability for compatible phones, advanced voice recognition, in-vehicle apps, personalized profiles for Infotainment and vehicle settings and greater memory.
    • Premium Bose 7-Speaker Sound System
      Includes Richbass woofer.
    • Wireless Charging
      Not compatible with all phones. Compliant batteries include QI and PMA technologies. Reference mobile devices manual to confirm what type of battery it uses.

    Engine: Duramax 3.0L Turbo-Diesel I6

    • 220 Amp Alternator
    • Engine Block Heater
    • 850 Heavy-Duty Battery
      Cold-cranking amps/95 amp-hr, maintenance free with rundown protection and retained accessory power.
    • Delete External Engine Oil Cooler

    Driver Alert Package I

    • Ultrasonic Front & Rear Park Assist
    • Lane Change Alert w/Side Blind Zone Alert
    • Rear Cross Traffic Alert
    • Perimeter Lighting

    X31 Off-Road Package

    • Off-Road Suspension
    • Hill Descent Control
    • Skid Plates
    • Heavy-Duty Air Filter

    Tires: 275/60R20SL AT BW

    • 255/80R17SL AS BW Spare Tire

    Radio: Premium GMC Infotainment Sys w/Navigation

    • SiriusXM w/360L
      Enjoy a trial subscription of the All Access package for the full 360L experience, with a greater variety of SiriusXM content, a more personalized experience and easier navigation. With the All Access package, you can also enjoy your favorites everywhere you go, with the SiriusXM app, online and at home on compatible connected devices. Important: the SiriusXM radio trial package is not provided on vehicles that are ordered for Fleet Daily Rental (FDR) use. If you decide to continue service after your trial, the subscription plan you choose will automatically renew thereafter and you will be charged according to your chosen payment method at then-current rates. Fees and taxes apply. See the SiriusXM customer agreement at www.siriusxm.com for complete terms and how to cancel. All fees, content, features and availability are subject to change. GM connected vehicle services vary by vehicle model and require active service plan, working electrical system, cell reception and GPS signal. See onstar.com for details and limitations.

    120-Volt Instrument Panel Power Outlet

    • 120-Volt Bed Mounted Power Outlet
      400 watts shared with (KI4) instrument panel mounted power outlet.

    Radio: Premium GMC Infotainment Sys w/Multi-Touch

    • 6-Speaker Audio System Feature
    • SiriusXM w/360L
      Enjoy a trial subscription of the All Access package for the full 360L experience, with a greater variety of SiriusXM content, a more personalized experience and easier navigation. With the All Access package, you can also enjoy your favorites everywhere you go, with the SiriusXM app, online and at home on compatible connected devices. Important: the SiriusXM radio trial package is not provided on vehicles that are ordered for Fleet Daily Rental (FDR) use. If you decide to continue service after your trial, the subscription plan you choose will automatically renew thereafter and you will be charged according to your chosen payment method at then-current rates. Fees and taxes apply. See the SiriusXM customer agreement at www.siriusxm.com for complete terms and how to cancel. All fees, content, features and availability are subject to change. GM connected vehicle services vary by vehicle model and require active service plan, working electrical system, cell reception and GPS signal. See onstar.com for details and limitations.

    Front 40/20/40 Split-Bench Seat

    • 10-Way Power Driver Seat Adjuster w/Lumbar
    • 10-Way Power Passenger Seat Adjuster w/Lumbar
    • Driver Memory
      Recalls driver presets for power driver seat and outside mirrors.

    Preferred Equipment Group 4SA

    • Radio: Premium GMC Infotainment Sys w/Multi-Touch
      Includes 8" diagonal color touch-screen, AM/FM stereo, Bluetooth streaming audio for music and most phones; featuring wireless Android Auto and Apple CarPlay capability for compatible phones, advanced voice recognition, in-vehicle apps, personalized profiles for Infotainment and vehicle settings.
    • Compass
      Located in instrument cluster.
    • Electric Rear-Window Defogger
    • Power Door Locks

    Trailering Package

    • Hitch Guidance

    ProGrade Trailering System

    • Hitch Guidance w/Hitch View
      Includes image adjustment, pan/zoom/tilt.
    • In-Vehicle Trailering App
      Includes checklist, trailer maintenance reminders, trailer security alerts, trailer mileage, tow/haul reminder and trailer electrical diagnostics.

    More pre-installed items

    • Federal Emissions Requirements
    • 3.23 Rear Axle Ratio
    • Automatic Stop/Start
    • HD Radio
    • Max seating capacity: 5
    • Fuel System: Direct Injection
    • Fuel tank capacity: 24 gal
    • Horsepower: 277
    2021 GMC Sierra 1500 SLT Crew Cab delivers premium capability and comfort in a refined package. This white truck is powered by a turbocharged 3.0L I-6 diesel engine paired with a smooth 10-speed automatic transmission, achieving EPA-estimated 22 city / 26 highway MPG Actual mileage may vary. Four-wheel drive and the X31 Off-Road Package equip this Sierra for confident handling on any terrain, while the SLT Premium Plus Package elevates your driving experience with premium appointments and modern technology.

    - 3.0L I-6 Diesel Turbocharged engine
    - 10-Speed Automatic transmission with 4WD
    - X31 Off-Road Package
    - SLT Premium Plus Package
    - Heated front seats with ventilation
    - Premium GMC Infotainment System with Apple CarPlay/Android Auto
    - Lane Keep Assist with Lane Departure Warning
    - Adaptive Cruise Control with Forward Collision Alert
    - Spray-On Pickup Bed Liner with GMC Logo
    - 20 Polished Aluminum Wheels with All-Terrain Tires

    The Sierra delivers capability where it matters most. Equipped with a ProGrade Trailering System and integrated trailer brake controller, this truck handles substantial loads with confidence. Premium Bose audio, heated and ventilated front seats, and genuine leather trim create a commanding interior. Safety features including automatic emergency braking, rear cross traffic alert, and ultrasonic park assist provide peace of mind on every journey.

    This is the truck for drivers who demand both capability and refinement. Come see the Sierra 1500 SLT in our showroom and experience the combination of diesel efficiency, off-road readiness, and premium comfort that sets it apart.

    Peace of mind

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    Vehicle history report

    • Title information
    • Odometer readings
    • Accident data (if applicable)
    • Service history
    • Vehicle usage
    • Recall information (if applicable)
    • Warranty status
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    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.…
    All reviews on KBB.com
    Based on 71 consumer ratings for 2019–2026 models. Privacy