2026 GMC Sierra 1500 AT4

  • New
  • Diesel
$75,749MSRP
$70,647Final Price
$2,000 More For Your Trade
MARK SWEENEY BUICK GMC INC
Location Details
Call 888-223-7457
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    The overview

    Exterior Color
    Onyx Black
    Interior Color
    Jet Black with Kalahari accents, Perforated leathe
    Fuel Economy
    22/26 MPG City/Hwy
    Transmission
    Automatic
    Drivetrain
    4WD
    Engine
    3.0L Duramax® Turbo Diesel engine
    VIN
    1GTUUEE86TZ515229
    Stock Number
    TZ515229
    • AutoCheck
    • Basic: 3 Years/36,000 Miles
    • Corrosion: 3 Years/36,000 Miles, Rust-Through, 6 Years/100,000 Miles
    • Drivetrain: 5 Years/60,000 Miles, Sierra TurboMaxTM engines, 3.0L & 6.6L Duramax® Turbo-Diesel engines, and certain commercial, government, and qualified fleet vehicles: 5 years/100,000 miles
    • Maintenance: First Visit: 12 Months/12,000 Miles
    • Roadside Assistance: 5 Years/60,000 Miles, Sierra TurboMaxTM engines, 3.0L & 6.6L Duramax® Turbo-Diesel engines, and certain commercial, government, and qualified fleet vehicles: 5 years/100,000 miles
    • Warranty: <<< Preliminary 2026 Warranty >>>
    • Max seating capacity: 5
    • Fuel System: Direct Injection
    • Fuel tank capacity: 24 gal
    • Horsepower: 305
    • Towing capacity: 8700 lbs
    • 13.4" diagonal GMC Premium Infotainment System with Google built-in:
      • 13.4" diagonal GMC Premium Infotainment System with Google built-in, includes multi-touch display, AM/FM/SiriusXM1 radio capable
      • Bluetooth®2 streaming audio for music and select phones
      • Wireless Apple CarPlay™ capability for compatible phones3
      • Wireless Android Auto™ capability for compatible phones4
      • Customize and manage entertainment and vehicle feature setting
      • Use, control and manage select smartphone apps through the Infotainment system
      • Voice-activated technology for phone
    • Bluetooth®:
      • Pair your compatible mobile phone to your vehicle's infotainment system1
      • Place and receive hands-free phone calls
      • Store your phone's contact list in the system to place an outgoing call quickly using the touch-screen display or voice command system
      • With streaming audio capability, you can listen to files stored on your phone or Bluetooth digital media device
    • Bose® Premium Sound System:
      • 7-speakers with Richbass® woofer
      • Bose is renowned for expert sound engineering and high-quality audio and with premium speakers positioned throughout the cabin, you'll get rich, concert-like sound
      • May require additional optional equipment
    • SiriusXM with 360L Trial Subscription:
      • With your trial subscription, new GM vehicles equipped with SiriusXM with 360L advance in-car technology will bring you closer to your favorite stars, artists, creators, hosts and athletes1
      • SiriusXM with 360L transforms your ride with our most extensive and personalized radio experience on the road that lets you enjoy ad-free music, talk and news, live sports, comedy, podcasts and more
      • Experience SiriusXM wherever you go in your vehicle and on the SiriusXM app with personalization features to make discovering your perfect entertainment easier than ever before
    • Steering-wheel mounted controls:
      • Allow the driver to easily operate the audio system and phone interface controls
      • May require additional optional equipment
    • Wi-Fi® Hotspot capable:
      • Terms and limitations apply. See onstar.com or dealer for details.
      • May require additional optional equipment
    • Wireless Apple CarPlay/Wireless Android Auto capability for compatible phones:
      • Can use Apple CarPlay1 and Android Auto2 wirelessly
      • Apple CarPlay vehicle user interface is a product of Apple and its terms and privacy statements apply. Requires compatible iPhone and data plan rates apply. Apple CarPlay is a trademark of Apple Inc. Siri, iPhone and Apple Music are trademarks for Apple Inc, registered in the U.S. and other countries.
      • Vehicle user interface is a product of Google and its terms and privacy statements apply. To use Android Auto on your car display, you'll need an Android phone running Android 6 or higher, an active data plan, and the Android Auto app. Google, Android and Android Auto are trademarks of Google LLC.
    • 17" 255/80R17SL all-season, blackwall spare tire
    • 17" full-size spare steel wheel with Black finish
    • 20" 275/60R20SL all-terrain, blackwall tires
    • 20" machined aluminum wheels with Carbon Grey Metallic accents
    • Black mirror caps
    • Body-color door handles
    • Body-color front bumper
    • Body-color rear bumper
    • Cab-mounted cargo area lamps:
      • With switch in switch bank left of the steering wheel
      • Illuminates the cargo bed area
    • Cargo bed LED lighting:
      • Provides light to find cargo in the bed
      • Rear pillar lamps
    • CornerStep rear bumper:
      • Helps make it easier to get into and out of the pickup bed
      • Located at each end of the rear bumper
      • Textured step pads to help provide secure footing
    • Deep-tinted glass:
      • Provides added protection from sun and glare
    • GMC MultiPro Tailgate:
      • Six function tailgate designed to help improve loading, unloading and accessing the cargo box
    • Heated, power, driver-side auto-dimming, power-folding outside mirrors:
      • Puddle lamps
      • Perimeter lighting
      • Memory setting
    • IntelliBeam:
      • At speeds above 25 mph, can automatically turn vehicle's high beams on and off according to surrounding traffic conditions1
      • May require additional optional equipment
    • LED fog lamps:
      • Help minimize glare in adverse driving conditions
    • LED projectors with Fade-on/ Fade-off animation, LED turn signals and Daytime Running Lamps:
      • C-shaped LED headlamps with signature lighting and innovative light blade technology
    • Off-Road High Clearance Steps:
      • Steps make it easier to get in and out of your truck
      • Textured step pads help provide secure footing
      • May require additional optional equipment
    • Perimeter Lighting
    • Power sliding rear window with rear defogger:
      • Helps to keep your rear view clear of fog or frost
      • Utilizes a warming grid to remove fog or frost from the rear window
      • The window switch is conveniently located in the overhead console for easy 1-touch operation
      • May require additional optional equipment
    • Power sunroof:
      • Opens over the first row at the push of a button
      • Retracts into the roof
      • Offers tilt and slide features with express-open and -close
      • May require additional optional equipment
    • Rainsense automatic wipers:
      • Turn on automatically when sensors detect varying degrees of precipitation on the windshield
    • Rear wheelhouse liners:
      • Help protect your truck's rear wheelhouse area from damage caused by dirt, rocks, mud, road salt and the weather
    • Soft folding Truck Bed Cover by RealTruck Advantage
    • Spare tire carrier lock:
      • Helps keep spare tire secure
      • Utilizes the same key as the door and ignition
    • Spray-on bedliner:
      • Provides a Black, textured, non-skid surface that helps protect the bed and minimizes cargo shifting
      • Covers the entire bed surface below side rails, front box top rail, gauge hole plugs and tie-downs
      • Chemically bonded, the sprayed-on liner permanently bonds to the truck bed, providing a watertight seal
      • Does not include spray-on liner on tailgate due to Black composite inner panel
      • Includes logo on all trims except PRO
    • Tailgate and bed rail protection caps
    • Tailgate with EZ Lift assist, power lock & release:
      • Hitch area lighting
      • May require additional optional equipment
    • 10-way power driver seat with power lumbar:
      • Moves the seat forward and back, and up and down
      • Tilt the seat cushion and seatbacks
    • 10-way power front passenger seat:
      • Forward and back
      • Up and down
      • Tilt seat cushion back and upright
      • Recline seatback up and down
      • Includes 2-way power lumbar
    • 12.3" diagonal color Driver Information Center:
      • Includes driver personalization, warning messages and vehicle information
      • Allows drivers to personalize vehicle features, including warning messages and vehicle information
    • 120-volt box-mounted power outlet:
      • 3-prong auxiliary household-style outlet
      • Located in the pickup bed
      • May require additional optional equipment
    • 120-volt power outlet:
      • 3-prong auxiliary household-style outlet
      • Located on the instrument panel
      • Makes it convenient for powering laptops, phone chargers and other electronic devices
      • May require additional optional equipment
    • 13.4" diagonal multicolor reconfigurable Infotainment screen
    • 3 Years SiriusXM:
      • Includes ad-free music, plus talk, sports, comedy, news, podcasts and more1
      • Enjoy channels curated by DJs, personalities, and tastemakers
      • Access all your favorite entertainment to enjoy in-vehicle and on the SiriusXM app
    • Adaptive Cruise Control:
      • Automatically follows a detected vehicle ahead at a driver-selected following gap1
      • If no vehicle is detected in your path, works like regular cruise control
      • You can always override the feature and take control
      • May require additional optional equipment
    • Assist handles:
      • Front A-pillar mounted for Driver and Passenger
      • Rear B-pillar mounted
    • Carpeted floor covering:
      • Color-keyed to match the interior
    • Compass:
      • Located in instrument cluster
    • Driver memory:
      • Recalls 2 driver presets for 10-way power seat and outside mirrors
      • May require additional optional equipment
    • Dual-zone automatic climate control:
      • Automatically maintains the selected temperatures for both the driver and front passenger
      • Allows individual climate settings for both driver and front passenger
      • Driver and front passenger can choose a temperature up to 30 degrees difference
    • Front bucket seats:
      • Includes center console
      • May require additional optional equipment
    • Front center console:
      • Includes reconfigurable feature with cupholders, cell phone storage, power cord management, file holder capacity, removable storage tray and Wireless Charging1
      • May require additional optional equipment
    • Head-Up Display:
      • Projects vehicle information onto the windshield low in the driver's line of sight to help you keep your eyes on the road
      • Multi-color 15" diagonal Head-Up Display
      • Can select key vehicle information to display including an off-road inclinometer
      • Adjustable vertical position and brightness of the display
      • May require additional optional equipment
    • Heated driver and front outboard passenger seats:
      • Separate buttons on the climate control panel allow you to choose from 3 levels of warmth
      • At the touch of a button you can warm the cushions and seatbacks with multilevel temperature control
      • Individually controlled
      • Seats can be programmed to automatically warm up when it's cold out
    • Heated rear outboard seats:
      • At the touch of a button you can warm the cushions and seatbacks
      • Provide comfort in cold weather for passengers in the rear outboard seating positions
      • May require additional optional equipment
    • Heated steering wheel:
      • With the press of a button the steering wheel quickly heats up to provide additional comfort on a cold day
    • In-Vehicle Trailering App:
      • Checklist1
      • Trailer light sequencing
      • Trailer maintenance reminders
      • Trailer security alerts
      • Trailer mileage
      • Tow/haul reminder
      • Trailer electrical diagnostics
      • Includes trailer tire pressure monitoring alert ONLY when trailer tire pressure monitor system is factory ordered and sensors are installed
      • May require additional optional equipment
    • Keyless Open and Start:
      • With the Keyless Entry fob in your possession, conveniently locks and unlocks your car's doors without manually activating the key fob
      • With the vehicle in Park or Neutral, press the brake pedal and then press the start/stop button to start the vehicle; the button will illuminate
      • Shift to Park and press the start/stop button to turn off the vehicle
    • Outside temperature display:
      • Located in infotainment display
    • Power door locks:
      • Programmable
      • Allows you to lock and unlock doors easily whether it's from the driver or front passenger seat or from outside using the key fob
    • Power tilt and telescoping steering column:
      • Allows the driver to adjust the steering wheel up or down, and the steering column forward or back
      • Use the driver memory to save and recall memory settings
      • Provides extra comfort when entering or exiting the vehicle
      • May require additional optional equipment
    • Power windows:
      • Driver with express-up/down
      • May require additional optional equipment
    • Power windows:
      • Front passenger with express-up/down
      • May require additional optional equipment
    • Power windows with rear express-down:
      • May require additional optional equipment
    • Premium front floor liners with removable carpet insert
    • Premium rear floor liners with removable carpet insert:
      • May require additional optional equipment
    • Rear Camera Mirror:
      • Uses a camera to provide you with the option of using a wide and less obstructed view behind your vehicle while driving instead of a traditional rearview mirror1
      • The feature also allows brightness, vertical tilt and zoom adjustments
      • May require additional optional equipment
    • Rear air vents:
      • Provides cabin comfort for rear occupants
    • Rear window defogger:
      • Helps to keep your rear view clear of fog or frost
      • Utilizes a warming grid to help remove fog or frost from the rear window
    • Remote Start:
      • Start your vehicle remotely and step into a comfortably warmed or cooled vehicle, depending on the weather and your preset preferences
      • Locks doors and turns on parking lamps while the engine is running
      • Activates the climate control system
    • Theft-deterrent unauthorized entry system:
      • Sounds the horn and flashes the turn signals when someone attempts to open the vehicle without the proper key or remote transmitter
      • Helps deter unauthorized entry, helping to protect your vehicle
    • USB ports:
      • (2) Charge ports located on rear of console1
    • USB ports:
      • (2) Data/charge ports located inside center console1
    • USB ports:
      • (2) First row, located on console1
    • Universal Home Remote:
      • 3-channel programmable
      • Conveniently activates compatible devices such as garage door openers, security systems, and home automation devices from inside your vehicle
      • May require additional optional equipment
    • Up-level rear seat with storage package:
      • 60/40 Full-length folding bench seat
      • Seatback storage on left and right side
      • Center fold out armrest with 2 cupholders
      • Underseat storage (full cab width)
    • Ventilated driver and front passenger seats:
      • Separate buttons on the climate control panel allow you to choose from 3 levels of fan circulation
      • Individually controlled
      • Cooling feature includes both seatbacks and cushions
      • May require additional optional equipment
    • Wireless Charging:
      • Uses induction technology for portable electronic devices
      • Convenient charging location at the front of the center console
      • Device may require optional case for phones that are compatible
      • Customers can charge their smartphones while they drive without connecting to any cables
      • May require additional optional equipment
    • Wrapped steering wheel
    • 10-speed automatic transmission with Electronic Precision shift and front bucket seats:
      • Electronically controlled transmission with overdrive and Driver Shift Control
      • Tow/Haul mode reduces shift cycling for better control and cooling when towing or hauling heavy loads
      • Powertrain Grade Braking
        • Automatically uses the engine and transmission to slow the truck to maintain desired speeds when driving downhill
        • Reduces brake wear and increases vehicle control
      • Cruise Grade Braking
        • Downshifts automatically to slow the truck as it drives downhill if it exceeds the cruise set speed by a certain amount
      • May require additional optional equipment
    • 2-speed Autotrac Transfer Case:
      • 2WD HI mode
        • Vehicle operates in 2-wheel drive
        • In this mode the transfer case & front driveline hardware are disengaged to improve fuel economy
        • Suitable for routine driving on all road surfaces
      • 4WD Auto mode
        • 4WD Auto enables the transfer-case to provide the performance benefits of a full time active AWD system
        • The 4WD Auto controls automatically adjust torque in response to parameters such as driver inputs, wheel slip control, vehicle dynamic state (understeer/oversteer)
        • Ideal for wet or wintry conditions, but can be used on any road surface. Suitable for light off road usage
      • 4WD HI mode
        • Transfer case engages front driveline and power is transferred to both the front & rear axles
        • In 4WD HI the transfer case clutch maintains higher preemptive torque levels for increased traction vs 4WD Auto
        • Suitable for use on slippery road surfaces or off-road conditions such as deep sand, snow or rough terrain
      • 4WD LO mode
        • In 4WD Low the transfer case clutch maintains a high preemptive coupling torque to maximize traction and improve wheel control when climbing or descending steep grades or obstacles
        • Suitable for off road usage, steep terrain, deep snow or sand
        • Ideal for off road driving to maximize low speed traction and increase control on steep grades
      • Neutral
        • ONLY used for towing vehicle (Dinghy tow capability)- allows vehicle to roll freely
      • May require additional optional equipment
    • 220-amp alternator:
      • May require additional optional equipment
    • 3.0L Duramax® Turbo Diesel engine:
      • 305 hp [227 kW] @ 3750 rpm
      • 495 lb-ft of torque [671 Nm] @ 2750 rpm
      • Paired with a 10-speed automatic transmission
    • 3.23 rear axle ratio:
      • May require additional optional equipment
    • 4-wheel antilock disc brakes:
      • Help reduce wheel lockup and maintain steering control during hard braking on most slippery surfaces
      • Duralife brake rotors have better resistance to corrosion to increase rotor life, minimize brake pulsation, and improve aesthetic appearance
    • 7,200 lbs. GVWR:
      • When properly equipped; includes weight of vehicle, passengers, cargo and equipment
    • Aluminized stainless-steel muffler and tailpipe
    • Automatic Stop/Start:
      • At complete stops, when drivers keep their foot on the brake pedal, and under certain conditions, the engine shuts off
      • When drivers remove their foot from the brake, the engine automatically restarts
      • Under certain circumstances, the engine will not shut off at a complete stop
      • This feature can be disabled with a switch on the center stack
    • Automatic locking rear differential:
      • When the differential senses a significant difference in wheel speed, it locks to turn both rear wheels in unison for added traction
      • The Eaton® Locker senses a difference in wheel speed of approximately 100 rpm
    • Brake pad wear indicator
    • Capless fuel fill:
      • Prevents paint scratches that can result from a tethered fuel cap
      • Creates a tight seal around the fuel-pump nozzle when the nozzle is fully inserted
    • Cargo tie-downs (12)
    • Dual-outlet exhaust:
      • Integrated into rear bumper
      • Aluminized stainless-steel muffler and tailpipes
      • May require additional optional equipment
    • Electric Power Steering:
      • Electric, rack-mounted with variable assist
      • Increases or decreases the amount of assist depending on the steering wheel angle
      • The system delivers great on-center precision and confident performance at higher speeds
      • Steering assist is greater during low-speed maneuvers, such as parking
    • Electronic Transmission Range Selector:
      • Console mounted
      • Includes steering column paddle shifters
      • May require additional optional equipment
    • Engine block heater:
      • Helps ease cold weather starts
      • Heats the engine and engine block fluids
    • Fully boxed frame:
      • Hydroformed front section
      • High-strength steel
    • Heavy-Duty Air Filter:
      • Thick construction helps to trap more dirt before it can enter the air intake
      • May require additional optional equipment
    • Heavy-duty 850 cold-cranking amps battery:
      • 95 Amp-hr
      • Maintenance-free with rundown protection and retained accessory power
      • May require additional optional equipment
    • Hill Descent Control:
      • Uses antilock braking to help provide a smooth, controlled descent
      • Helps driver maintain control of the vehicle without depressing the brake pedal
      • Activates by pushing a button below the instrument panel
      • May require additional optional equipment
    • Integrated trailer brake controller:
      • Integrated with the antilock brake system (ABS)
      • Helps provide measured brake force signaling to electric-controlled trailer brake systems
      • Trailer gain and output are displayed in the Driver Information Center
    • Off-Road, 2-inch factory-installed lift:
      • Monotube Rancho® shocks
      • Provides more ground clearance
      • Improved approach and departure angles
      • May require additional optional equipment
    • Pickup bed:
      • Roll-formed high-strength steel
    • Push Button Start
    • Red vertical recovery hooks:
      • Two front frame-mounted1
    • Skid plates:
      • Help protect the front underbody, oil pan, differential case and transfer case
      • May require additional optional equipment
    • AT4 Preferred Package:
      • Universal Home Remote
      • Rear sliding power window
    • AT4 Premium Package:
      • AT4 Preferred Package
      • Off-Road High Clearance steps
    • GMC Pro Safety:
      • Forward Collision Alert1
      • Following Distance Indicator1
      • Front Pedestrian Braking1
      • Lane Keep Assist with Lane Departure Warning1
      • Automatic Emergency Braking1
      • Buckle to Drive1
      • IntelliBeam1
      • Safety Alert Seat1 on AT4, AT4X, Denali and Denali Ultimate
      • Enhanced Automatic Emergency Braking1 is standard on Denali and Denali Ultimate2
    • Technology Package:
      • Rear Camera Mirror1
      • Multi-color 15" Diagonal Head-Up Display
      • Bed View Camera on AT4
      • May require additional optional equipment
    • Trailering Package:
      • Trailer hitch1
      • Trailering hitch platform
      • Includes a 2" receiver hitch, 4-pin and 7-pin connectors
      • 7-wire electrical harness and 7-pin sealed connector for connecting your trailer's lights and brakes to your vehicle
      • Hitch Guidance2
    • LED Daytime Running Lamps:
      • Daytime Running Lamps automatically illuminate signature lighting
    • 6 airbags:
      • Dual-stage frontal airbags for driver and front outboard passenger1
      • Seat-mounted side-impact airbags for driver and front outboard passenger1
      • Head-curtain airbags for outboard seating positions1
      • Includes front outboard Passenger Sensing System for frontal outboard passenger airbag and illuminates a status light that indicates whether the airbag is on or off1
    • Automatic Emergency Braking:
      • Can help you avoid or reduce the severity of a collision with a detected vehicle you're following using camera technology1
      • Can automatically provide hard emergency braking or enhance your hard braking
      • Works at speeds between 5 and 50 mph
      • May require additional optional equipment
    • Bed View Camera:
      • Camera in the Center High Mount Stop Lamp (CHMSL) provides an elevated view of the truck bed from the back of the cab1
      • Allows driver to see inside the cargo bed on the infotainment display to help with 5th wheel or gooseneck hitching and to check cargo
      • Includes 2 Trailer Camera Provisions
      • May require additional optional equipment
    • Buckle to Drive:
      • Helps remind the driver to buckle their seat belt before driving by preventing the vehicle from being shifted out of PARK temporarily when the driver's seat belt is not buckled
      • The feature also reminds the front passenger to buckle up, if equipped
    • Following Distance Indicator:
      • Displays the following time in seconds between your vehicle and a detected vehicle in front of you1
      • Designed to help you maintain a safe following distance
      • May require additional optional equipment
    • Forward Collision Alert:
      • Warns you if it detects a potential collision with a detected vehicle you're following so you can take action1
      • Can also provide a tailgating alert if you're following a vehicle much too closely
      • May require additional optional equipment
    • Front and Rear Park Assist:
      • Provides alerts of nearby detected vehicles and objects in front of or behind your vehicle1
      • These can help you park and avoid collisions
      • May require additional optional equipment
    • HD Surround Vision:
      • Provides selectable digital camera views of the area around your vehicle1
      • Can help you park or avoid vehicles and objects
      • You can also display a guideline to show where your vehicle is heading
      • Tailgate must be in the raised position for the HD Rear Vision Camera1 to operate properly
      • Includes 2 Trailer Camera Provisions
      • Requires Auxiliary Trailer Camera if one of the following camera views is desired: Transparent Trailer, Rear Trailer View, Picture-in-Picture or Inside Trailer View
      • May require additional optional equipment
    • Hitch Guidance:
      • When in Reverse, displays a centered guideline on the Rear Vision Camera view1
      • Can help you line up the hitch to your trailer
      • When driving, lets you check the trailer using Rear Vision Camera view
    • Hitch View:
      • Shows a close-up view of the trailer hitch1
      • In Reverse, the view can be used to line up your hitch to your trailer
      • When driving, the view can be used to check your trailer hitch
      • Shifting to Park automatically engages the Electric Parking Brake (if equipped)
      • May require additional optional equipment
    • Inside/Rear Trailer Camera Input:
      • Includes trailer viewing software
      • May require additional optional equipment
    • Lane Keep Assist with Lane Departure Warning:
      • Uses a brief steering wheel turn to alert you when it detects you are unintentionally drifting out of your lane lines1
      • System alerts do not occur if you're using your turn signal, or it detects you may be intentionally leaving your lane
      • You may receive additional Lane Departure Warning alerts if needed
      • May require additional optional equipment
    • OnStar Basics:
      • Drive confidently with core OnStar services including1
        • Remote commands
        • Built-in voice assistance
        • Real-time traffic and navigation
        • Automatic Crash Response to help if you're in need
    • OnStar® services capable:
      • See onstar.com for details and limitations. Services vary by model. Service plan required.
    • Rear Cross Traffic Braking:
      • When in Reverse, alerts you or automatically provides hard emergency braking to prevent a collision with detected vehicles crossing behind you1
      • May require additional optional equipment
    • Rear Pedestrian Alert:
      • When you're in Reverse, alerts you to detected pedestrians directly behind your vehicle1
      • Limited nighttime and low visibility performance
      • May require additional optional equipment
    • Rear Seat Belt Indicator
    • Rear Seat Reminder:
      • Helps to remind the driver to check the back seat(s) before leaving the vehicle1
      • Activates when rear doors are opened and closed up to 10 minutes before or anytime while your vehicle is on
      • Under certain conditions, once the vehicle is switched off, designed to sound audible chimes and display a visual message within the driver display
      • Activates only once each time the vehicle is turned on and off, and would require re-activation on a second trip
    • Safety Alert Seat:
      • Uses left-, right- or both-side driver seat vibration pulses to help you detect and identify the direction of potential crashes1
      • You can also switch to beeping crash avoidance alerts
      • May require additional optional equipment
    • Seat Belt Adjustable Guide Loops:
      • Front row only
    • Tire Pressure Monitoring System with Tire Fill Alert:
      • Monitors the pressure in each tire and alerts you if there is a low-pressure condition in one or more of the tires1
      • Provides visual and audible alerts outside the vehicle when inflating an under inflated tire to the recommended tire pressure
      • Properly inflate tires to help optimize your vehicle's ride, handling and efficiency
    • Trailer Side Blind Zone Alert:
      • Provides visual side-mirror alerts when a moving vehicle is detected in a side blind zone that is extended to trailer lengths1
    • Front Pedestrian Braking:
      • At speeds between 5 and 50 mph, can help you avoid or reduce the severity of a collision with a pedestrian it detects directly in front of you1
      • Provides pedestrian alerts and can automatically provide hard emergency braking or enhance driver's hard braking
      • Limited nighttime and low visibility performance
      • May require additional optional equipment
    • StabiliTrak, electronic stability control system with traction control:
      • Automatically helps enhance control, particularly during emergency maneuvers, by adjusting the brakes and engine torque to help you stay on your intended path
      • Activates when vehicle sensors detect a difference between the driver's intended path and the direction the vehicle is actually travelling
      • Includes Traction Control that detects wheel slippage and applies brake pressure and/or reduces engine power to help the driver maintain control when accelerating on wet or snow-covered roads
      • Includes Brake Assist that senses how hard and fast a driver hits the brake pedal and gives extra braking assistance, if required
      • Includes Trailer Sway Control
      • Hill Start Assist

    Notes from the dealer

    This stunning 2026 GMC Sierra 1500 AT4 in Black delivers premium truck capability with refined comfort. Built on the AT4 platform with a turbocharged 3.0L diesel engine and 4WD, this crew cab short box combines efficiency with commanding presence.

    - Soft folding truck bed cover by RealTruck
    - Power sunroof and premium leather interior with Kalahari accents
    - 3.0L diesel I6 with 10-speed automatic transmission
    - Technology Package with navigation and wireless Apple CarPlay/Android Auto
    - Premium Bose 7-speaker sound system with SiriusXM trial
    - Heated and ventilated front seats with power adjustment
    - 20-inch machined aluminum wheels

    Experience the perfect blend of capability and luxury. Visit us today to take this Sierra AT4 for a test drive.

    Peace of mind

    A name you can trust

    MARK SWEENEY BUICK GMC INC is dedicated to your satisfaction before, during, and after your purchase. We'll go the extra mile to take care of you.
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    KBB.com Consumer Reviews

    Kelley Blue Book Logo0.0out of 5 overall
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        Disclaimer: The Manufacturer’s Suggested Retail Price excludes tax, title, license, dealer fees and optional equipment. Dealer sets final price.

        1Dealer Discount applied to everyone