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.
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
- Automatic
- Drivetrain
- 4WD
- Engine
- Engine: Duramax 3.0L, Turbo-Diesel, Inline 6 Cylinder
- VIN
- 3GTU9DET7MG266344
- Stock Number
- 12028C
The full specifications
- Max seating capacity: 5
- Fuel System: Direct Injection
- Fuel tank capacity: 24 gal
- Horsepower: 277
Notes from the dealer
Peace of mind
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- Accident data (if applicable)
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- Recall information (if applicable)
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Premier Chevrolet GMC Beatrice is dedicated to your satisfaction before, during, and after your purchase. We'll go the extra mile to take care of you.
More about usKBB.com Consumer Reviews
4.0out 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.
