Reduced by $100 since Feb 17, 2026

2021 GMC Sierra 1500 AT4



  • $39,880 INTERNET PRICE

  • Retail Price: $46,895
  • Discounts: $7,015
  • Internet Price: $39,880
  • Please Note: We provide Savings on our vehicles daily based on current inventory supply.

  • Check to see if this vehicle qualifies for a Sale Price.

Visit our Store

Vehicle Information

VIN: 3GTU9EET1MG348818
Stock #: KM17838
Model Code: TK10543
  • Body Style 4D Crew Cab
  • Exterior Color Summit White
  • Interior Color Jet Black With Kalahari Accents
  • Mileage 60,934
  • Fuel Economy
    City/Highway 22/26 MPG
  • Engine 6 Cyl - 3 L
  • Transmission 10-Speed Automatic / 4WD
  • Fuel Type Diesel

Highlighted Features

Feature availability subject to final vehicle configuration. Please reference window sticker for more info.

Dealer Comments

Discover the ultimate off-road companion in the 2021 GMC Sierra 1500 AT4. This exceptional truck is engineered to conquer any terrain, while delivering the premium features and capabilities you demand. With its powerful 3.0L I6 Duramax Diesel engine, advanced 4x4 system, and rugged off-road suspension, the Sierra AT4 is ready to take on the toughest challenges.

- 4x4 - NEVER WORRY ABOUT THE WEATHER!
- Backup Camera
- Bluetooth®
- Premium Wheels
- Tow Package
- AT4 PREFERRED PACKAGE
- 3.0L I-6 Diesel Turbocharged (Duramax)
- 20 x 9 Machined Aluminum Wheels with Carbon Grey Metallic Accents
- LT265/60R20 MT Blackwall Goodyear Wrangler Territory Tires
- Engine Block Heater

This Sierra AT4 is equipped with an impressive array of premium features that elevate your driving experience. Enjoy the convenience of the 8 diagonal Premium GMC Infotainment System with navigation, the exceptional sound quality of the Bose Premium Audio System, and the added comfort of wireless charging. The rear sliding power window and Universal Home Remote further enhance the Sierra's versatility.

Designed to tackle the toughest terrain, the AT4 package includes an off-road-tuned suspension, electronic locking rear differential, and underbody skid plates to protect vital components. The ProGrade Trailering System and Integrated Trailer Brake Controller make towing a breeze, while the Hitch Guidance with Hitch View and In-Vehicle Trailering App provide added confidence and control.

Step inside the Sierra AT4 and experience the epitome of rugged luxury. The perforated leather-appointed front seats are both heated and ventilated, ensuring your comfort in any weather. The heated steering wheel and dual-zone automatic climate control add to the premium cabin experience.

With its impressive capabilities, premium features, and uncompromising style, the 2021 GMC Sierra 1500 AT4 is the ultimate choice for those who demand the best. Visit our showroom today and let us demonstrate how this exceptional truck can enhance your driving adventures.

Eligible Benefits

All Features

  • Trailering Package includes trailer hitch, 7-pin and 4-pin connectors and (CTT) Hitch Guidance
  • ProGrade Trailering System includes (PZ8) Hitch Guidance with Hitch View and (U1D) In-vehicle Trailering App
  • Rear axle, 3.23 ratio
  • Pickup bed
  • Air filter, heavy-duty
  • Hill Descent Control
  • Auto-locking rear differential
  • Transfer case, two-speed, electronic Autotrac with push button control (4WD models only)
  • Suspension, Off-Road with 2" factory installed lift and monotube shocks
  • Four wheel drive
  • Frame, fully-boxed, hydroformed front section
  • Trailer brake controller, integrated
  • Recovery hooks, Red
  • Skid Plates
  • Cargo tie downs (12), fixed, rated at 500 lbs per corner
  • Steering, Electric Power Steering (EPS) assist, rack-and-pinion
  • Brakes, 4-wheel antilock, 4-wheel disc with DURALIFE rotors
  • Capless Fuel Fill
  • Exhaust, dual with premium tips (With (PCP) AT4 CarbonPro Edition the exhaust tips will be black.)
  • Exhaust, aluminized stainless-steel muffler and tailpipe
  • Wheels, 18" x 8.5" (45.7 cm x 21.6 cm) machined aluminum with Dark Grey accents
  • Tires, 265/65R18SL all-terrain, blackwall
  • Tire, spare 265/70R17SL all-season, blackwall
  • Wheel, 17" x 8" (43.2 cm x 20.3 cm) full-size, steel spare
  • Wheelhouse liners, rear
  • Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door
  • Bumper, front, body-color lower (Front bumper color will be high gloss black.)
  • Bumper, rear body-color with corner steps
  • CornerStep, rear bumper
  • Grille (Body-color surround with high gloss Black mesh and Black chrome inserts. With (PCP) AT4 CarbonPro Edition the grille will have a unique grille surround with Black Chrome finish.)
  • Headlamps, LED reflector (high intensity) with LED turn signals and LED signature Daytime Running Lamps
  • Fog lamps, LED
  • Taillamps, LED signature taillight with LED stop and reverse light
  • Mirrors, outside heated power-adjustable, power-folding and driver-side auto-dimming puddle lamps, side perimeter lighting and memory
  • Mirror caps, high gloss Black (Deleted with (DQS) outside power adjustable vertical trailering mirrors and mirror caps will be chrome.)
  • Glass, deep-tinted
  • Lamps, cargo area, cab mounted integrated with center high mount stop lamp, with switch in bank on left side of steering wheel
  • LED Cargo Area Lighting located in cargo bed activated with switch on center switch bank or key fob
  • Tailgate, GMC MultiPro Tailgate with six functional load/access features
  • Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light
  • Tailgate and bed rail protection caps, top
  • Door handles, body-color
  • Bed Liner, Spray-on Pickup bedliner with GMC logo (does not include spray-on liner on tailgate due to Black composite inner panel) (AT4 logo replaces GMC logo. Deleted with (PCP) AT4 CarbonPro Edition. Double Cab and Crew Cab models are available with Ship Thru codes (VBE), (VCO), (VDT), (VYC) or (VYS).)
  • Audio system, Premium GMC Infotainment System with 8" diagonal color touch-screen, includes 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 (Note: (PZ8) Hitch Guidance with hitch view is included with trim. Includes SiriusXM with 360L.)
  • HD Radio (Standard on vehicles built before 7-12-2021. Certain vehicles built on or after 7-12-2021 will include (RG0) Not Equipped with HD Radio, which removes (U2L) HD Radio. See dealer for details.)
  • SiriusXM Radio
  • SiriusXM with 360L Equipped with SiriusXM with 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.)
  • Audio system feature, 6-speaker system
  • Bluetooth® for phone connectivity to vehicle infotainment system
  • Wireless Phone Projection, for Apple CarPlay and Android Auto
  • Steering wheel audio controls
  • 4G LTE Wi-Fi Hotspot capable (Terms and limitations apply. See onstar.com or dealer for details.)
  • Seats, front bucket with center console
  • Seat adjuster, driver 10-way power including lumbar
  • Seat adjuster, passenger 10-way power including lumbar
  • Seating, heated driver and front outboard passenger
  • Driver memory recalls driver "presets" for power driver seat and outside mirrors
  • Seats, ventilated driver and front passenger
  • Seat, Up-level Rear with Storage Package, 60/40 folding bench for Crew Cab models, includes full-length bench seat, seatback storage on left and right side, center fold out armrest with 2 cupholders, full cab width under-seat storage, (includes child seat top tether anchor)
  • Center Console, floor-mounted with cup holders, cell phone storage, power cord management, hanging file folder capability
  • Floor covering, color-keyed carpeting
  • Premium Floor Liners with removable carpet insert, front
  • Premium Floor Liners with removable carpet insert, rear
  • Steering column, manual Tilt-Wheel and telescoping
  • Steering wheel, leather-wrapped
  • Steering wheel, heated
  • Driver Information Center, 4.2" diagonal color display includes driver personalization
  • In-vehicle Trailering App, System includes checklist, trailer maintenance reminders, trailer security alerts, trailer mileage, tow/haul reminder and trailer electrical diagnostics
  • Compass, located in instrument cluster
  • Exterior Temperature Display, located in radio display
  • Brake lining wear indicator
  • Windows, power front, drivers express up/down
  • Window, power front, passenger express up/down
  • Windows, power rear, express down
  • Door locks, power
  • Keyless Open and Start
  • Remote vehicle starter system
  • Cruise control, steering wheel-mounted
  • Theft-deterrent system, unauthorized entry
  • Steering column, lock control, electrical
  • USB ports, 2 (first row) located on instrument panel
  • USB Ports (Inside Console with bucket seats), 2 also includes 1 SD card reader and auxiliary jack
  • Power outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)
  • Power outlet, front auxiliary, 12-volt
  • USB ports, dual, charge-only (2nd row)
  • Power outlet, rear auxiliary, 12-volt
  • Power outlet, bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet)
  • Air conditioning, dual-zone automatic climate control
  • Air vents, rear
  • Defogger, rear-window electric
  • Mirror, inside rearview auto-dimming
  • Assist handles front A-pillar mounted for driver and passenger, rear B-pillar mounted
  • GMC Connected Access capable (Subject to terms. See onstar.com or dealer for details.)
  • StabiliTrak, stability control system with Proactive Roll Avoidance and traction control, includes electronic trailer sway control and hill start assist
  • Daytime Running Lamps, LED signature lighting
  • Airbags, Dual-stage frontal airbags for driver and front outboard passenger; Seat-mounted side-impact airbags for driver and front outboard passenger; Head-curtain airbags for front and rear outboard seating positions; Includes front outboard Passenger Sensing System for frontal outboard passenger airbag (Always use seat belts and child restraints. Children are safer when properly secured in a rear seat in the appropriate child restraint. See the Owner's Manual for more information.)
  • OnStar and GMC connected services capable (Terms and limitations apply. See onstar.com or dealer for details.)
  • Hitch Guidance with Hitch View with image adjustment, Pan/Zoom/Tilt
  • Hitch Guidance
  • HD Rear Vision Camera
  • Teen Driver a configurable feature that lets you activate customizable vehicle settings associated with a key fob, to help encourage safe driving behavior. It can limit certain available vehicle features, and it prevents certain safety systems from being turned off. An in-vehicle report card gives you information on driving habits and helps you to continue to coach your new driver
  • Tire Pressure Monitoring System with Tire Fill Alert (does not apply to spare tire)
  • Rear Seat Reminder
  • Mileage
    • Fuel Economy Est-Combined (MPG): 24
    • Fuel Economy Est-Combined (MPG): 18
    • EPA Fuel Economy Est - City (MPG): 22
    • EPA Fuel Economy Est - City (MPG): 16
    • EPA Fuel Economy Est - Hwy (MPG): 26
    • EPA Fuel Economy Est - Hwy (MPG): 21
  • Electrical
    • Cold Cranking Amps @ 0° F (Primary): 850
    • Cold Cranking Amps @ 0° F (Primary): 730
    • Maximum Alternator Capacity (amps): 170
    • Maximum Alternator Watts: - TBD -
  • Cooling System
    • Total Cooling System Capacity (qts): - TBD -
  • Weight Information
    • Gross Axle Wt Rating - Front (lbs): 3800
    • Gross Axle Wt Rating - Rear (lbs): 3800
    • Curb Weight - Front (lbs): 2839
    • Curb Weight - Rear (lbs): 1976
    • Gross Vehicle Weight Rating Cap (lbs): 7000
    • Gross Combined Wt Rating (lbs): 15000
  • Trailering
    • Dead Weight Hitch - Max Trailer Wt. (lbs): 5000
    • Dead Weight Hitch - Max Tongue Wt. (lbs): 500
    • Wt Distributing Hitch - Max Trailer Wt. (lbs): 8800
    • Wt Distributing Hitch - Max Trailer Wt. (lbs): 9200
    • Wt Distributing Hitch - Max Tongue Wt. (lbs): 880
    • Wt Distributing Hitch - Max Tongue Wt. (lbs): 920
    • Fifth Wheel Hitch - Max Trailer Wt. (lbs): 6700
    • Fifth Wheel Hitch - Max Trailer Wt. (lbs): 7500
    • Fifth Wheel Hitch - Max Tongue Wt. (lbs): 1675
    • Fifth Wheel Hitch - Max Tongue Wt. (lbs): 1875
    • Maximum Trailering Capacity (lbs): 9200
  • Suspension
    • Suspension Type - Front: Independent
    • Suspension Type - Rear: Solid Axle
    • Spring Capacity - Front (lbs): 3800
    • Spring Capacity - Rear (lbs): 3850
    • Axle Type - Front: - TBD -
    • Axle Type - Rear: - TBD -
    • Axle Capacity - Front (lbs): 3800
    • Axle Capacity - Rear (lbs): 3800
    • Axle Ratio (:1) - Front: 3.23
    • Axle Ratio (:1) - Rear: 3.23
    • Shock Absorber Diameter - Front (mm): 50
    • Shock Absorber Diameter - Rear (mm): 51
    • Stabilizer Bar Diameter - Front (in): 1.30
  • Brakes
    • Brake Type: Pwr
    • Brake ABS System: 4-Wheel
    • Disc - Front (Yes or ): Yes
    • Disc - Rear (Yes or ): Yes
    • Front Brake Rotor Diam x Thickness (in): 13.5 x 1.18
    • Rear Brake Rotor Diam x Thickness (in): 13.6 x 0.79
  • Tires
    • Front Tire Order Code: XCK
    • Rear Tire Order Code: XCK
    • Spare Tire Order Code: XCQ
    • Front Tire Size: 265/65R18SL
    • Rear Tire Size: 265/65R18SL
    • Spare Tire Size: 265/70R17SL
    • Front Tire Capacity (lbs): - TBD -
    • Rear Tire Capacity (lbs): - TBD -
    • Spare Tire Capacity (lbs): - TBD -
    • Revolutions/Mile @ 45 mph - Front: - TBD -
    • Revolutions/Mile @ 45 mph - Rear: - TBD -
    • Revolutions/Mile @ 45 mph - Spare: - TBD -
  • Wheels
    • Front Wheel Size (in): 18 x 8.5
    • Rear Wheel Size (in): 18 x 8.5
    • Spare Wheel Size (in): 17 x - TBD -
    • Front Wheel Material: Aluminum
    • Rear Wheel Material: Aluminum
    • Spare Wheel Material: Steel
  • Steering
    • Steering Type: Electric Rack & Pinion
    • Steering Ratio (:1), On Center: - TBD -
    • Steering Ratio (:1), At Lock: - TBD -
    • Turning Diameter - Curb to Curb (ft): 46.9
    • Turning Diameter - Curb to Curb (ft): 46.3
    • Turning Diameter - Wall to Wall (ft): - TBD -
  • Frame
    • Frame Type: Hydroformed
  • Fuel Tank
    • Fuel Tank Capacity, Approx (gal): 24
    • Fuel Tank Location: - TBD -
  • Exterior Dimensions
    • Wheelbase (in): 147.53
    • Length, Overall (in): 231.72
    • Width, Max w/o mirrors (in): 81.24
    • Height, Overall (in): 78.35
    • Overhang, Front (in): - TBD -
    • Overhang, Rear w/o bumper (in): - TBD -
    • Front Bumper to Back of Cab (in): - TBD -
    • Cab to Axle (in): - TBD -
    • Cab to End of Frame (in): - TBD -
    • Ground to Top of Load Floor (in): - TBD -
    • Ground to Top of Frame (in): - TBD -
    • Frame Width, Rear (in): - TBD -
    • Ground Clearance, Front (in): 10.88
    • Ground Clearance, Rear (in): 10.88
  • Cargo Area Dimensions
    • Cargo Box Length @ Floor (in): 69.92
    • Cargo Box Width @ Top, Rear (in): - TBD -
    • Cargo Box Width @ Floor (in): 71.4
    • Cargo Box Width @ Wheelhousings (in): 50.63
    • Cargo Box (Area) Height (in): 22.4
    • Tailgate Width (in): - TBD -
    • Cargo Volume (ft³): 62.9
    • Ext'd Cab Cargo Volume (ft³): - TBD -
  • Interior Dimensions
    • Passenger Capacity: 5
    • Front Head Room (in): 43.03
    • Front Leg Room (in): 44.53
    • Front Shoulder Room (in): 66.02
    • Front Hip Room (in): 61.18
    • Second Head Room (in): 40.12
    • Second Leg Room (in): 43.4
    • Second Shoulder Room (in): 65.16
    • Second Hip Room (in): 60.24
  • Summary
    • Vehicle Name: GMC Sierra 1500
    • Body Style: Crew Cab Pickup
    • Body Code: E63
  • Emissions
    • Tons/yr of CO2 Emissions @ 15K mi/year: 8.5
    • Tons/yr of CO2 Emissions @ 15K mi/year: 9.9
Vehicles You Might Like
  • $28,480 INTERNET PRICE


  • $28,980 INTERNET PRICE


  • $31,880 INTERNET PRICE


  • $35,780 INTERNET PRICE


*Selling price excludes tax, tag, registration, title, and $798 dealer fees. Special APR offers and dealer and/or customer incentives cannot be combined.

Must present Internet Discount prior to purchase to receive savings. Dealer installed options are not included in pricing. Must present Internet Discount prior to purchase to receive savings.

*Though uncommon, it is possible for errors to occur when posting information. We appreciate your understanding and respecting our right to correct errors. 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.