This 2021 GMC Sierra 1500 SLE delivers capable diesel performance with proven reliability in a classic black exterior. With its 3.0L diesel I6 engine, 10-speed automatic transmission, and 4WD capability, this crew cab combines efficiency with the towing strength you need. At 120,625 miles, this truck offers real-world value backed by SmartBuy Certified status and a 3-month/3,000-mile warranty.
• SmartBuy Certified - 3mo/3k Mile Warranty
• SiriusXM AM/FM Radio
• Apple CarPlay/Android Auto Integration
• HD Rear Vision Camera
• Heated Steering Wheel & Heated Front Seats
• Auto-Locking Rear Differential
• Fully Automatic Headlights
• Universal Home Remote
• Remote Keyless Entry
• 4WD with Heavy Duty Suspension
Step into a well-appointed interior with cloth seating, dual-zone automatic climate control, and modern connectivity at your fingertips. This Sierra handles work and weekend drives with equal confidence, delivering an estimated 22 city and 26 highway MPG. We invite you to schedule a test drive today and experience what smart truck ownership feels like.
Prices may change at any time and are subject to availability and prior sale. Taxes, title, license fees, and a $180 documentation fee are not included. Payments shown are estimates; actual terms vary by buyer and credit approval. Dealer is not responsible for errors in pricing or vehicle details, information is believed accurate but not guaranteed. Photos are for illustration only�"confirm details with the dealer. Fuel economy ratings and driving range figures are based on EPA estimates for new vehicles, and actual mileage and range may vary. By submitting your phone number, you consent to occasional SMS or calls about our products and promotions; standard messaging rates apply. See dealer for details.
2021 GMC Sierra 1500 SLE
- Used
- Diesel
The overview
- Exterior Color
- Onyx Black
- Interior Color
- Black
- Odometer
- 120,625 miles
- Body/Seating
- Truck Crew Cab/6 seats
- Seats
- 6 seats
- Fuel Economy
- 18/21 MPG City/Hwy
- Transmission
- 10-Speed Automatic
- Drivetrain
- 4x4
- Engine
- I-6 cyl
- VIN
- 1GTU9BET4MZ130029
- Stock Number
- N53739A
The highlights
- Automatic temperature control
- Wireless phone connectivity
- Front dual zone A/C
- Split folding rear seat
- Heated front seats
- Perimeter/approach lights
- Remote keyless entry
- Heated steering wheel
- Steering wheel mounted audio controls
- Fully automatic headlights
- Security system
- Power driver seat
The full specifications
- 1-touch down
- 1-touch up
- Air conditioning
- Automatic temperature control
- Driver door bin
- Driver vanity mirror
- Front beverage holders
- Front dual zone A/C
- Heated steering wheel
- Illuminated entry
- Overhead console
- Passenger door bin
- Passenger vanity mirror
- Power windows
- Proximity key: doors and push button start
- Rear door bins
- Remote engine start: keyfob
- Remote keyless entry
- Speed control
- Telescoping steering wheel
- Tilt steering wheel
- Alloy wheels
- Front anti-roll bar
- Front wheel independent suspension
- Power steering
- Speed-sensing steering
- 1st row LCD monitors: 2
- Primary LCD size: 8.0"
- Radio data system
- Speakers: 6
- Steering wheel mounted audio controls
- Wireless phone connectivity: Bluetooth
- Front center armrest: w/storage
- Front seats: bench
- Heated front seats
- Max seating capacity: 6
- Power 2-way driver lumbar support
- Power driver seat
- Rear seats: split-bench
- Rear seats Folding position: fold-up cushion
- Seat Upholstery: cloth
- Split folding rear seat
- Cylinder deactivation
- Drive type: four-wheel
- Engine location: front
- Fuel economy city: 18mpg
- Fuel economy combined: 19mpg
- Fuel economy highway: 21mpg
- Fuel tank capacity: 24.0gal.
- Hybrid traction battery type: none
- Manual-shift auto
- Mode select transmission
- Rear locking differential
- Standard fuel economy fuel type: gasoline
- Variable valve control
- Ground clearance (min): 205mm (8.1")
- Bumpers: chrome
- Door mirrors: chrome
- Heated door mirrors
- Left rear passenger door: conventional
- Power door mirrors
- Rear cargo: tailgate
- Rear step bumper
- Right rear passenger: conventional
- Trailer hitch receiver
- Trailer sway control
- Exterior body width: 2,063mm (81.2")
- Exterior height: 1,918mm (75.5")
- Exterior length: 5,885mm (231.7")
- Front headroom: 1,093mm (43.0")
- Front hiproom: 1,554mm (61.2")
- Front legroom: 1,131mm (44.5")
- Front shoulder room: 1,677mm (66.0")
- Rear headroom: 1,019mm (40.1")
- Rear hiproom: 1,530mm (60.2")
- Rear legroom: 1,102mm (43.4")
- Rear shoulder room: 1,655mm (65.2")
- Wheelbase: 3,744mm (147.4")
- Appearance: analog
- Compass
- Delay-off headlights
- Front reading lights
- Fully automatic headlights
- Low tire pressure warning
- Oil pressure gauge
- Outside temperature display
- Rear reading lights
- Rear window defroster
- Tachometer
- Trip computer
- Variably intermittent wipers
- Voltmeter
- 4 wheel disc brakes
- ABS brakes
- Brake assist
- Dual front impact airbags
- Dual front side impact airbags
- Electronic stability
- Ignition disable
- Occupant sensing airbag
- Overhead airbag
- Panic alarm
- Perimeter/approach lights
- Security system
- Traction control
Notes from the dealer
Peace of mind
Vehicle history report
- Title information
- Odometer readings
- Accident data (if applicable)
- Service history
- Vehicle usage
- Recall information (if applicable)
- Warranty status
A name you can trust
McGrath Chevyland 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.
