2021 GMC Sierra 1500 AT4 Crew Cab in Gray with a commanding 6.2L EcoTec3 V8 engine paired with a smooth 10-speed automatic transmission. Built for serious capability, this 4WD truck combines premium comfort with genuine off-road performance. With just over 65,000 miles, this Sierra remains well within its prime, offering years of reliable service ahead.
- Premium Bose 7-Speaker Sound System with SiriusXM 360L
- Premium GMC Infotainment System with Navigation and Apple CarPlay/Android Auto
- Multicolor 15" Head-Up Display
- ProGrade Trailering System with Integrated Trailer Brake Controller and Hitch Guidance
- Advanced Safety: Automatic Emergency Braking, Lane Keep Assist, Rear Cross Traffic Alert, and HD Surround Vision
- Heated and Ventilated Leather Front Seats with 10-Way Power Adjustment
- Power Sunroof and Power Sliding Rear Window
- Spray-On Pickup Bed Liner with AT4 Logo
- Adaptive Cruise Control with Following Distance Indicator
- Wireless Charging and 4G LTE Wi-Fi Hotspot
The AT4 package delivers rugged authenticity with the TechConnect convenience you expect from a modern luxury truck. Jet Black leather with Kalahari accents creates an upscale cabin environment, while technology like the rear camera mirror, lane change alert, and in-vehicle trailering app keep you confident whether you're navigating city streets or remote trails. The heavy-duty constructionĆ¢Ā"including AT4 high-clearance steps, body-color surround grille, and recovery hooksĆ¢Ā"demonstrates GMC's commitment to genuine capability.
With EPA-estimated 15 city / 19 highway MPG, this Sierra delivers the power and torque truck buyers demand. Come experience the commanding presence and refined interior of this AT4 in personĆ¢Ā"this is the truck built for those who refuse to compromise between performance and premium features.
VIN: 3GTP9EEL0MG180229Stock #: C3115APre-Owned 2021 GMCSierra 1500 AT4 4WD
- Exterior Color
- Dark Sky Metallic
- Interior Color
- Jet Black With Kalahari Accents
- Odometer
- 65,151 miles
- Body/Seating
- Truck Crew Cab/5 seats
- Seats
- 5 seats
- Fuel Economy
- 15/19 MPG City/Hwy
- Transmission
- Automatic
- Drivetrain
- 4WD
- Engine
- 8
- VIN
- 3GTP9EEL0MG180229
- Stock Number
- C3115A
Highlighted Features
- Navigation system
- Lane departure
- Leather upholstery
- Automatic temperature control
- Power moonroof
- Premium audio system
- Wireless phone connectivity
- Parking sensors
- Exterior parking camera front
- Exterior parking camera left
- Exterior parking camera right
- Exterior parking camera rear
Included Packages & Accessories
Detailed Specifications
- 1-touch down
- 1-touch up
- Adaptive Cruise Control
- Air conditioning
- Auto-dimming rearview mirror
- Automatic temperature control
- Driver door bin
- Driver vanity mirror
- Front beverage holders
- Front dual zone A/C
- Garage door transmitter
- Heated steering wheel
- Illuminated entry
- Memory seat
- Moonroof sunshade: manual
- Navigation system
- Overhead console
- Passenger door bin
- Passenger vanity mirror
- Power moonroof
- Power windows
- Proximity key: doors and push button start
- Rear beverage holders
- 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
- Tires: all-terrain
- 1st row LCD monitors: 2
- Premium audio system: Premium GMC Infotainment System
- Primary LCD size: 8.0"
- Radio data system
- Smart device integration: Apple CarPlay/Android Auto
- Speaker type: Bose
- Speakers: 7
- Steering wheel mounted audio controls
- Wireless phone connectivity: Bluetooth
- Front center armrest
- Front seats: bucket
- Heated front seats
- Heated rear seats
- Leather upholstery
- Max seating capacity: 5
- Power 2-way driver lumbar support
- Power 2-way passenger lumbar support
- Power driver seat
- Power passenger seat
- Rear seat center armrest
- Rear seats: split-bench
- Rear seats Folding position: fold-up cushion
- Seat Upholstery: leather
- Split folding rear seat
- Ventilated front seats
- Cylinder deactivation
- Drive type: four-wheel
- Engine location: front
- Fuel economy city: 15mpg
- Fuel economy combined: 18mpg
- Fuel economy highway: 19mpg
- Fuel tank capacity: 24.0gal.
- Hybrid traction battery type: none
- Manual-shift auto
- Mode select transmission
- Rear locking differential
- Recommended fuel: Premium Unleaded
- Standard fuel economy fuel type: gasoline
- Torque: 460 lb.-ft. @ 4,100RPM
- Transmission: 10 speed automatic
- Variable valve control
- Ground clearance (min): 276mm (10.9")
- Auto-dimming door mirrors
- Bedliner
- Bumpers: body-color
- Heated door mirrors
- Left rear passenger door: conventional
- Power door mirrors
- Rear cargo: tailgate
- Rear step bumper
- Right rear passenger: conventional
- Skid plates
- Trailer hitch receiver
- Trailer sway control
- Engine displacement: 6.2 L
- Engine torque: 460 lb.-ft. @ 4,100RPM
- Exterior body width: 2,063mm (81.2")
- Exterior height: 1,990mm (78.3")
- 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")
- Towing capacity: 3,901kg (8,600lbs)
- Wheelbase: 3,744mm (147.4")
- Appearance: analog
- Auto high-beam headlights
- Blind spot: Lane Change Alert with Side Blind Zone Alert warning
- Compass
- Delay-off headlights
- Exterior parking camera cargo
- Exterior parking camera front
- Exterior parking camera left
- Exterior parking camera rear
- Exterior parking camera right
- Front fog lights
- Front reading lights
- Fully automatic headlights
- Heads up display
- Lane departure: Lane Keep Assist with Lane Departure Warning active
- Low tire pressure warning
- Oil pressure gauge
- Outside temperature display
- Parking sensors: UltraSonic front and rear
- 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
- Forward collision: Forward Collision Alert with Automatic Braking mitigation
- Front pedestrian detection: prevention
- Ignition disable
- Occupant sensing airbag
- Overhead airbag
- Panic alarm
- Perimeter/approach lights
- Rear collision: Rear Cross-Traffic Alert warning
- Security system
- Traction control
Dealer Notes
KBB.com Consumer Reviews
- 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 Etcā¦. My truck has 30000 miles I when to trade in they offer $46000 I paid $86000 the depreciation is incredible I donāt 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 Iāve 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.
*The advertised price does not include sales tax, vehicle registration fees, finance charges, and any other fees required by law. Price INCLDUES $490 PA documentation fee. We attempt to update this inventory on a regular basis. However, there can be lag time between the sale of a vehicle and the update of the inventory. Although every reasonable effort has been made to ensure the accuracy of the information contained on this site, absolute accuracy cannot be guaranteed. This site, and all information and materials appearing on it, are presented to the user "as is" without warranty of any kind, either express or implied. All vehicles are subject to prior sale.
All vehicle specifications, prices and equipment are subject to change without notice. See above for information on purchase financing and lease program expiration dates. Prices and payments (including the amount down payment) do not include tax, titles, tags, documentation charges, emissions testing charges, or other fees required by law or lending organizations. The estimated payments may not include upfront finance charges that must be paid to be eligible for the purchase financing program used to estimate the APR and payments. Listed Annual Percentage Rates are provided for the selected purchase financing or lease programs available on the current date. Program expiration dates reflect currently announced program end dates, but these programs are subject to change at any time.
Lessees will be financially responsible for mileage beyond the elected quantity and for vehicle maintenance and repairs and excessive vehicle wear. Option to purchase at lease end for an amount may be determined at lease signing. Payments may be higher in some states. You may not be able to combine other incentives with the purchase financing or leasing programs presented above. Residency restrictions may apply. See dealer for details.
Listed APR, down payment, payments, incentives and other terms are estimates for example purposes only. Information provided is based on very well-qualified buyers or lessees. The payment information provided here is not a commitment by any organization to provide credit, leases or other programs. Some customers may not qualify for listed programs. Your terms may vary. Lessor must approve lease. Credit approval required.
*The advertised price does not include sales tax, vehicle registration fees, finance charges, and any other fees required by law. Price excludes $477 documentation fee. Ā Brand new vehicles with Aubrey Alexander Discount will have rebates factored into Your Price. We attempt to update this inventory on a regular basis. However, there can be lag time between the sale of a vehicle and the update of the inventory.
EPA mileage estimates are for newly manufactured vehicles only. Your actual mileage will vary depending on how you drive and maintain your vehicle.
Before purchasing this vehicle, it is your responsibility to address any and all differences between information on this website and the actual vehicle specifications and/or any warranties offered prior to the sale of this vehicle. Vehicle data on this website is compiled from publicly available sources believed by the publisher to be reliable. Vehicle data is subject to change without notice. The publisher assumes no responsibility for errors and/or omissions in this data the compilation of this data and makes no representations express or implied to any actual or prospective purchaser of the vehicle as to the condition of the vehicle, vehicle specifications, ownership, vehicle history, equipment/accessories, price or warranties. 2016 Toyota Selinsgrove, PA.
