2026 GMC Sierra 1500 AT4

  • New
$76,545MSRP
$73,825Groulx Sale Price*
Value Your Trade
Groulx Automotive
Location Details
Call 734-636-0994
We’re here to help

    The overview

    Exterior Color
    Coastal Dune
    Interior Color
    Jet Black with Kalahari accents, Perforated leathe
    Fuel Economy
    15/19 MPG City/Hwy
    Transmission
    Automatic
    Drivetrain
    4WD
    Engine
    6.2L EcoTec3 V8 engine
    VIN
    3GTUUEEL9TG425755
    Stock Number
    GT623
      • 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: 420
      • Towing capacity: 8900 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
      • Black nameplates:
        • Add a personalized feel to your vehicle's exterior
        • May require additional optional equipment
      • 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
      • Front and rear Black GMC emblems
      • 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 reflector (high intensity) headlamps 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 Black assist steps:
        • Steps make it easier to get in and out of your truck
        • Textured step pads help provide secure footing
        • Black powder-coat finish
      • 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
      • 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
      • 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 road1
        • 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 improved 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
      • 170-amp alternator:
        • 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
      • 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
      • 6.2L EcoTec3 V8 engine:
        • 420 hp [313 kW] @ 5600 rpm
        • 460 lb-ft of torque [624 Nm] @ 4100 rpm
        • Dynamic Fuel Management technology
        • Paired with a 10-speed automatic transmission
        • May require additional optional equipment
      • 7,100 lbs. GVWR:
        • When properly equipped; includes weight of vehicle, passengers, cargo and equipment
      • Active Exhaust, Dual, sport-mode enabled
      • 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)
      • 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
      • External auxiliary transmission oil cooler:
        • Heavy-duty air-to-oil cooler
        • Helps provides optimal transmission performance even when operating under a heavy load or towing a trailer
        • May require additional optional equipment
      • External engine oil cooler:
        • Heavy-duty air-to-oil cooler
        • Helps prevent possible engine oil breakdown under heavy loads
      • 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 730 cold-cranking amps battery:
        • 80 Amp-hr
        • Maintenance-free with rundown protection and retained accessory power
        • 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
      • Black Badging Package:
        • Front and rear Black GMC emblems
        • Black nameplates
      • 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 Camera 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
      Meet the 2026 GMC Sierra 1500 AT4, a powerhouse built for serious capability and refined comfort. This Crew Cab Short Box combines the commanding presence of a premium truck with the technology and luxury appointments you expect from GMC's premium lineup. With its beige exterior and jet black leather interior accented with Kalahari, this Sierra delivers both distinctive style and timeless appeal.

      - EcoTec3 6.2L V8 engine with dual active sport-mode exhaust
      - Power sunroof with advanced technology package
      - Crew Cab with heated and ventilated leather seating for all rows
      - 4WD with off-road suspension and hill descent control
      - Premium Bose 7-speaker sound system with wireless Apple CarPlay and Android Auto
      - Multicolor 15 head-up display with HD surround vision
      - Advanced safety suite including automatic emergency braking and lane keep assist
      - Spray-on bedliner with GMC logo and integrated trailer brake controller
      - Apple CarPlay and Android Auto capability with Wi-Fi hotspot
      - Black badging and sport step packages for distinctive AT4 styling

      The 2026 Sierra AT4 is engineered for those who demand more from their truck whether you're tackling challenging terrain or enjoying highway refinement. Visit us today to experience this exceptional new truck firsthand.

      Groulx Automotive is a 3rd generation dealership in Monroe Michigan that has been in business for over 75 years. We value exceptional service and honesty. We would love an opportunity to earn your business.

      Peace of mind

      A name you can trust

      Groulx Automotive is dedicated to your satisfaction before, during, and after your purchase. We'll go the extra mile to take care of you.
      More about us

      KBB.com Consumer Reviews

      Kelley Blue Book Logo0.0out of 5 overall
        Privacy
          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

          DEALER DISCLAIMER

          Dealer prices are conditional based on factory incentives. Dealer is not liable for pricing typos on vehicles in inventory. All offers are conditional based on current available inventory in stock, and limited quantities are available. Vehicles may be sold. Offers are subject to dealer discretion, and may be withdrawn at any time. See dealer for details.

          1Everyone qualifies for Groulx Discount.