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Price: $89,825

View Price Details

New 2026 GMC Sierra 2500 AT4 Crew Cab

Stock #SI15311

Window Sticker

Vehicle Notes

Experience the power and luxury of the new 2026 GMC Sierra 2500 HD AT4 Crew Cab 4WD, finished in striking Red and showing only 5 miles on the odometer…
Read More… Experience the power and luxury of the new 2026 GMC Sierra 2500 HD AT4 Crew Cab 4WD, finished in striking Red and showing only 5 miles on the odometer. Under the hood, unleash the Duramax 6.6L Turbo-Diesel V8 with 470hp and 975 lb-ft torque, paired with an Allison 10-speed automatic transmission and AutoTrac 4WD for ultimate capability. The AT4 Premium Plus Package brings a power sunroof, premium leather heated and ventilated front seats, Bose audio, head-up display, and a 13.4" touchscreen with wireless phone projection. Take on any terrain with the X31 Off-Road Package, including Rancho shocks, skid plates, and hill descent control. Towing is a breeze thanks to ProGrade Trailering, gooseneck/5th wheel prep, trailer camera provisions, and a trailer brake controller. Stay secure with Sierra HD Pro Safety—featuring forward collision alert, lane departure warning, and HD Surround Vision. Enjoy practical touches like MultiPro Tailgate, spray-on bedliner, integrated bed steps, and power sliding rear window. This Sierra AT4 blends rugged performance, advanced technology, and premium comfort—ready for work or adventure. Net Price includes a Factory Rebate available to all, if applicable, on this vehicle and is valid on a cash or financed purchase only by an individual for their personal use. The net price does not apply to a lease. Some Factory Rebates are California Resident specific and may vary for residents of other states. No sales to Dealers, Brokers or Exporters. For out of state purchase, customers must be present to purchase. If shipping is required, dealership must facilitate; no exceptions. Please contact us for special Multi-Vehicle or Fleet pricing. Price includes $85 Doc Fee and $37 electronic registration fee. Price does not include government fees and taxes, any finance charges, and $1.75 per new tire state tire fee. All vehicles are subject to prior sale. While every reasonable effort is made to ensure the accuracy of this information, we are not responsible for any errors or omissions contained on these pages. Leasing & financing available on approved credit. Trade-ins accepted. Offers, incentives, discounts, or financing are subject to expiration and other restrictions. See dealer for qualifications and complete details. Images, prices, and options shown, including vehicle color, trim, options, pricing and other specifications are subject to availability, incentive offerings, current pricing and credit worthiness. Price shown is valid through the close of business today. Serving Tustin, Santa Ana, Orange, Irvine, Villa Park, Anaheim Hills, Costa Mesa, Walnut, Huntington Beach, Garden Grove, Aliso Viejo, Laguna, Anaheim, Orange County, Lake Forest, Laguna Nigel, Laguna Hills, and Newport Beach.
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Chassis Details

Stock Number

SI15311

Stock Type

New

Year

2026

Make

GMC

Model

Sierra 2500

Class

GVWR

11,350

Drivetrain

4x4

Cab Type

Crew

Vehicle Trim

Crew Cab, Standard Bed, AT4, 4WD

Interior Color

Jet Black w/Kalahari Accents

Seating Capacity

Exterior Color Description

Volcanic Red Tintcoat

Engine Cylinder Count

Engine

Duramax 6.6L Biodiesel Turbo V8 470hp 975ft. lbs.

Transmission Type

Automatic

Fuel Type

Diesel

Engine Model

L5P

Engine Size (L)

6.6

Vehicle Options

Engine cooler: Engine oil cooler
Radiator
Powertrain type: ICE
Selectable mode transmission
Transmission oil cooler
Drive type: Four-wheel drive
Traction control: All-speed ABS and driveline traction control
Suspension ride type front: Independent front suspension
Suspension type front: Short and long arm front suspension
Front anti-roll: Front anti-roll bar
Springs front: Front torsion springs
Suspension ride type rear: Rigid axle rear suspension
Springs rear: Rear leaf springs
Rear Springs: Regular grade rear springs
Speed sensitive steering: Digital Steering Assist speed sensitive power steering
Steering: Hydraulic power-assist steering system
Steering type: Re-circulating ball steering
Ventilated brakes: Front and rear ventilated disc brakes
ABS Brakes: Four channel ABS brakes
Electronic parking brake
Driver selectable steering effort
Suspension type rear: Leaf spring rear suspension
Tailpipe: Stainless steel single exhaust
Rear locking differential: Automatic rear locking differential
Sequential shift control
Locking hub control: Auto locking hub control
Electronic stability control: Electronic stability control system with anti-roll
Brake type: 4-wheel disc brakes
ABS Brakes: 4-wheel antilock (ABS) brakes
Convex spotter: Driver and passenger convex spotter mirrors
Headlight type: Projector beam headlights
Headlights: LED low and high beam headlights
Auto headlights: Auto on/off headlight control
Running lights: LED daytime running lights
Multiple headlights: Multiple enclosed headlights
Delay off headlights: Delay-off headlights
High mount stop light: High mounted center stop light
Perimeter approach lighting: Remote activated perimeter approach lighting with puddle lights
LED brake lights
Front impact airbag driver: Driver front impact airbag
Front side impact airbag driver: Seat mounted side impact driver airbag
Overhead airbags: Curtain first and second-row overhead airbags
Front impact airbag passenger: Passenger front impact airbag
Front side impact airbag passenger: Seat mounted side impact front passenger airbag
Occupancy sensor: Airbag occupancy sensor
Number of airbags: 6 airbags
3-point seatbelt: Rear seat center 3-point seatbelt
Seatbelt pretensioners: Front seatbelt pretensioners
Illuminated entry
Instrumentation display: Digital/analog instrumentation display
Configurable instrumentation gauges
Low tire pressure warning: Tire specific low air pressure warning
Immobilizer
Vehicle tracker: Stolen Vehicle Assistance vehicle tracker with vehicle slowdown
Restricted driving mode/alerts: Teen Driver restricted driving mode/alerts
Hill start assist
Seatbelt pretensioners number: 2 seatbelt pre-tensioners
Child door locks: Manual rear child safety door locks
Turn signal in door mirrors: Turn signal indicator in door mirrors
Fog lights: LED front fog lights
Gauge cluster display size (inches): Gauge cluster display size: 12.30
Remote panic alarm
Cab mounted cargo light
Body panels: Galvanized steel/aluminum body panels with side impact beams
Number of doors: 4 doors
Bed-rail protectors: Pickup bed-rail protectors
Bumpers front: Body-colored front bumper
Tow hooks front: 2 front tow hooks
Bumpers rear: Body-colored rear bumper
Fenders: Black fender flares
Window Trim: Black side window trim
Door handle material: Body-colored door handles
Paint: Non-metallic paint
Special paint: Monotone paint
Wheel covers: Wheel hub covers
Spare tire location: Crank-down spare tire
Door mirror type: Power extendable trailer mirrors
Exterior mirror spot lights: Exterior mirror LED spot lights
Towing class: Class IV tow rating
Towing hitch: Trailer hitch
Towing brake controller: Trailer brake controller
Towing trailer sway: Trailer sway control
Towing hitch light: Trailer hitch light
Rear bumper step
Door mirror style: Black door mirrors
Bumper insert: Dark chrome front bumper insert
Bumper rub strip front: Black front bumper rub strip
Passenger doors rear left: Conventional left rear passenger door
Door mirrors: Power door mirrors
Rear cargo door: MultiPro Tailgate tailgate
Heated door mirrors: Heated driver and passenger side door mirrors
Boxside steps: BedStep integrated side steps
Passenger doors rear right: Conventional right rear passenger door
Visor driver mirror: Driver visor mirror
Visor illuminated driver mirror: Illuminated driver visor mirror
Visor passenger mirror: Passenger visor mirror
Visor illuminated passenger mirror: Illuminated passenger visor mirror
Rear seat direction: Front facing rear seat
Overhead console: Mini overhead console
Glove box: Locking glove box
Number of beverage holders: 8 beverage holders
Seatback storage pockets: 2 seatback storage pockets
Door bins front: Driver and passenger door bins
Door bins rear: Rear door bins
Under seat tray rear: Rear under seat tray
Cruise control: Cruise control with steering wheel mounted controls
Adaptive cruise control
Driver foot rest
Door locks: Power door locks with 2 stage unlocking
Keyfob keyless entry
All-in-one key: All-in-one remote fob and ignition key
Auto door locks: Auto-locking doors
Auto-dimming door mirror driver: Auto-dimming driver side mirror
Tailgate control: Tailgate/power door lock
Keyfob cargo controls: Keyfob trunk control
Keyfob window controls: Keyfob window control
Tachometer
Oil pressure gauge
Engine/electric motor temperature gauge
Voltmeter
Transmission temperature gauge: Transmission fluid temperature gauge
Engine hour meter
Clock: Digital clock
Compass
Temperature display: Exterior temperature display
Folding door mirrors: Power folding door mirrors
Engine temperature warning
Battery charge warning
Key in vehicle warning
Door ajar warning
Turn signal warning: Turn signal on warning
Oil pressure warning
Transmission fluid temperature warning: Transmission fluid temp warning
Brake pad warning: Brake pad wear indicator
Rear seat check warning: Rear Seat Reminder rear seat check warning
Trip computer
First-row windows: Power first-row windows
Second-row windows: Power second-row windows
Wipers: Variable intermittent front windshield wipers
Easy lift tailgate: EZ Lift
Easy lower tailgate: EZ Lower
Beverage holders rear: Rear beverage holders
Auto-dimming door mirror passenger: Auto-dimming passenger side mirror
Built-in virtual assistant: Google Built-In built-in virtual assistant
Driver information center
Day/Night rearview mirror
Front reading lights
Rear reading lights
Variable panel light: Variable instrument panel light
Headlights on reminder
Trip odometer
Weight capacity alert: GCW Alert weight capacity alert
Integrated tailgate step
Full gauge cluster screen
Seating capacity: 5
Front head restraints: Height adjustable front seat head restraints
Front head restraint control: Manual front seat head restraint control
Rear seats fixed or removable: Fixed rear seats
Rear seats: Split-bench rear seat
Rear seat folding position: Fold-up rear seat cushion
Folding rear seats: 60-40 folding rear seats
Rear head restraints: Height adjustable rear seat head restraints
Rear head restraint control: Manual rear seat head restraint control
Rear head restraint control: 2 rear seat head restraints
Front seat upholstery: Leather front seat upholstery
Front seatback upholstery: Plastic front seatback upholstery
Door trim insert: Vinyl door trim insert
Headliner material: Cloth headliner material
Headliner coverage: Full headliner coverage
Floor covering: Full carpet floor covering
Panel insert: Aluminum instrument panel insert
Gearshifter material: Urethane gear shifter material
Door panel insert: Aluminum and sim carbon fiber door panel insert
Console insert material: Chrome console insert
Interior accents: Chrome interior accents
Rear seat upholstery: Vinyl rear seat upholstery
Rear seatback upholstery: Carpet rear seatback upholstery
Number of memory settings: 2 memory settings
Climate control: Automatic climate control
Air conditioning: Yes
Dual-zone front climate control
Rear under seat ducts: Rear under seat climate control ducts
Rear console climate control ducts
Steering wheel material: Leatherette steering wheel
Heated steering wheel
Armrests rear: Rear seat center armrest
Floor coverage: Full floor coverage
Cabback insulator
Seek scan
External memory: Premium GMC Infotainment System external memory control
Internet radio capability
Satellite trial: 3 month satellite trial subscription
Amplifier
Antenna: Fixed audio antenna
Number of first-row screens: 2 total number of 1st row displays
Speakers number: 7 speakers
Turn-by-turn nav: OnStar Turn-by-Turn Navigation
Emergency SOS Capable: OnStar vehicle integrated emergency SOS system
Internet access: Wi-Fi Hotspot capable mobile hotspot internet access
Mobile app access: MyGMC Mobile App mobile app access
Basic warranty: 36 month/36
000 miles
Powertrain warranty: 60 month/60
000 miles
Corrosion perforation warranty: 72 month/100
000 miles
Roadside warranty: 60 month/60
000 miles
Maintenance warranty: 12 month/7
500 miles
AT4 Premium Plus Package - Includes POWER SUNROOF
First-row sunroof: First-row sliding and tilting glass sunroof with power 1-touch activation sunshade
Off-Road High Clearance Step
TECHNOLOGY PACKAGE
Multicolor 15" Diagonal Head-Up Display
Head up display: Head-up display
Speedometer: Redundant digital speedometer
REAR CAMERA MIRROR
Rearview mirror: Auto-dimming rear view mirror
Video rearview mirror: Video-feed rearview mirror
AT4 EQUIPMENT GROUP - Includes LED CARGO AREA LIGHTING
TRAILER SIDE BLIND ZONE ALERT
SiriusXM with 360L Trial Subscription
REMOTE VEHICLE START
Keyfob remote start
Smart device remote start
SAFETY ALERT SEAT
Ultrasonic Front and Rear Park Assist
TRAILER CAMERA PROVISIONS
REAR-WINDOW DEFOGGER
Floor-Mounted Center Console
Beverage holders: Front beverage holders
Floor console: Full floor console
Floor console storage: Covered floor console storage
Armrests front center: Front seat center armrest
Gloss Black Header Grille and Grille Insert Bars
THEFT-DETERRENT SYSTEM
Bed View Camera with Two Trailer Camera Provisions
WIPERS
FRONT RAIN-SENSING
SIERRA HD PRO SAFETY * FORWARD COLLISION ALERT * FOLLOWING DISTANCE INDICATOR * FRONT PEDESTRIAN BRAKING * INTELLIBEAM
AUTO HIGH BEAM * LANE DEPARTURE WARNING * BUCKLE TO DRIVE * AUTOMATIC EMERGENCY BRAKING
FORWARD COLLISION ALERT
Following Distance Indicator
Front Pedestrian Braking
Buckle to Drive
Automatic Emergency Braking
Brake assist system: Automatic Emergency Braking brake assist system
IntelliBeam Automatic High Beam On/off
Lane Departure Warning
WIRELESS PHONE PROJECTION
2 USB Ports
Rear Cross Traffic Alert
120 VOLT POWER OUTLET
USB PORTS
SEATING
HEATED DRIVER AND FRONT OUTBOARD PASSENGER
Wireless Charging
X31 Off-Road Package
Off-Road Suspension
Suspension: Off-road ride suspension
Shock absorbers: Rancho gas-pressurized shock absorbers
Inclinometer
HILL DESCENT CONTROL
Skid Plates
Front Premium Floor Liners with Removable Carpet Insert
Steering Wheel Audio Controls
PREMIUM FLOOR LINERS
USB PORTS
OnStar Services Capable
120-VOLT BED-MOUNTED POWER OUTLET
Heated 2nd Row Outboard Seats
WINDOWS
POWER FRONT
PASSENGER EXPRESS UP/DOWN
One-touch down window: Front and rear one-touch down windows
One-touch up window: Driver and passenger one-touch up windows
BOSE PREMIUM AUDIO SYSTEM
2-Speed Active Transfer Case
4WD type: AutoTrac part and full-time 4WD
Transfer case: Electronic transfer case shift
Two-Speed Transfer Case
DEEP-TINTED GLASS
BEDLINER
SPRAY-ON
HD SURROUND VISION
Front camera: Front mounted camera with washer
Right camera: Right side camera
Left camera: Left side camera
Rear camera: HD Rear Vision Camera w/Hitch View rear mounted camera
Camera: HD Surround Vision w/Hitch View aerial view camera
Ventilated Driver and Front Passenger Seats
STEERING COLUMN
MANUAL TILT AND TELESCOPING
Steering wheel tilt: Manual tilting steering wheel
Steering wheel telescopic: Manual telescopic steering wheel
KEYLESS OPEN AND START
Proximity key: Keyless Open/Keyless Start with hands-free access and push button start
Ignition type: Push-button
ProGrade Trailering System
IN-VEHICLE TRAILERING APP
Vehicle and trailer reverse assist: Trailering Assist Guidelines vehicle and trailer reverse assist with visual graphic guidance only
Trailer light test
Trailer light malfunction warning
Trailer theft alarm
HITCH GUIDANCE WITH HITCH VIEW
Vehicle to trailer hitching assist: Hitch Guidance vehicle to trailer hitching assist
Push Button Start
Rear Wheelhouse Liners
AT4 PREFERRED PACKAGE - Includes Power Sliding Rear Window with Defogger
Rear windshield: Power rear windshield
Universal Home Remote
10-WAY POWER DRIVER SEAT INCLUDING LUMBAR - Includes Driver seat direction: Driver seat with 8-way directional controls
Driver lumbar: Driver seat with 2-way power lumbar
Power driver seat controls: Driver seat power reclining
lumbar support
cushion tilt
fore/aft control and height adjustable control
Front Bucket Seats - Includes SEAT ADJUSTER
PASSENGER 10-WAY POWER INCLUDING LUMBAR
Passenger seat direction: Front passenger seat with 8-way directional controls
Front passenger lumbar: Front passenger seat with 2-way power lumbar
Power passenger seat controls: Passenger seat power reclining
lumbar support
cushion tilt
fore/aft control and height adjustable control
DRIVER MEMORY
SEATS AND MIRRORS
Winter Grille Cover
PICKUP BED
LICENSE PLATE KIT
3.42 Axle Ratio
AM/FM Stereo with Premium GMC Infotainment System - Includes Voice activated audio: Voice activated audio controls
Wireless streaming: Bluetooth wireless audio streaming
Primary display size: 13.4 inch primary display
Primary display touchscreen: Primary monitor touchscreen
Handsfree: Bluetooth handsfree wireless device connectivity
11
350 lbs (5
148 Kg) GVWR
Engine Block Heater
EXHAUST BRAKE
220-Amp Alternator - Includes Alternator Type: Alternator
Duramax 6.6L Turbo-Diesel V8 Engine - Includes Capped Fuel Fill
TRANS:ALLISON 10-SPEED AUTO
Transmission: Allison 10-speed automatic
Overdrive transmission
Lock-up transmission
Transmission Type: Automatic
Dual Heavy-Duty 70 Amp Battery
Battery type: Dual lead acid batteries
Battery run down protection
Accessory power: Retained accessory power
Engine Location: Front mounted engine
Fuel Type: Diesel
Ignition: Compression ignition system
Engine Mounting direction: Longitudinal mounted engine
Engine block material: Iron engine block
Cylinder head material: Aluminum cylinder head
DEF fluid gauge: Diesel exhaust fluid (def) gauge
Low level warnings: Low level warning for oil
coolant
fuel
washer fluid
brake fluid and diesel exhaust fluid (DEF)
Engine: Duramax 6.6L V-8 direct injection
intercooled turbo
diesel
engine with 470HP
Engine Short: Duramax 6.6L V-8
Engine Configuration: Duramax V8
Compressor: Intercooled turbo
20" High Gloss Black 8 Spokes Aluminum Wheels
LT275/65R20 AT BW Tires - Includes SPARE TIRE
Tires: LT275/65SR20 AT BSW front and rear tires
Black Lug Nut & Wheel Lock Kit
HITCH PACKAGE (DEALER INSTALLED)
GOOSENECK/5TH WHEEL PACKAGE: * STAMPED BED HOLES W/CAPS * 7-PIN TRAILER HARNESS - Includes Towing wiring harness: Trailer wiring harness
Towing prep: 5th wheel and gooseneck prep
California State Emissions Requirements
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Body Details

Body Type

Pickup

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Pricing Details

MSRP	$90,825
Documentation Fee	+ $85
Electronic Filing Fee	+ $37
Total Price	$90,947
Rebates	- $1,000
Dealer Discount	- $122
Price	$89,825
Total Savings	$1,122
Additional Upfit Cost

Price includes all dealer fees. Excludes taxes, title, registration, and license fees.

Vehicle available NOW in Tustin, CA.

Contact Tustin Buick GMC for more info.

Disclaimer:

*Net Price includes a Factory Rebate available to all, if applicable, on this vehicle and is valid on a cash or financed purchase only by an individual for their personal use. The net price does not apply to a lease. Some Factory Rebates are California Resident specific and may vary for residents of other states. We Only Provide 4 Gallons of Gas at Purchase. No sales to Dealers, Brokers or Exporters. For out of state purchase, customers must be present to purchase. If shipping is required, dealership must facilitate; no exceptions. Please contact us for special Multi-Vehicle or Fleet pricing. Price includes $85 Doc Fee, $37 electronic registration fee, and any emission testing charge. Price does not include government fees and taxes, any finance charges, and $1.75 per new tire state tire fee. All vehicles are subject to prior sale. While every reasonable effort is made to ensure the accuracy of this information, we are not responsible for any errors or omissions contained on these pages. Leasing & financing available on approved credit. Trade-ins accepted. Offers, incentives, discounts, or financing are subject to expiration and other restrictions. See dealer for qualifications and complete details. Images, prices, and options shown, including vehicle color, trim, options, pricing and other specifications are subject to availability, incentive offerings, current pricing and credit worthiness. *EPA-estimate metric: these are contingent on ideal conditions within a lab. Real-world situations such as carrying passengers or cargo, using climate control, driving style, and ambient temperatures can affect actual metrics.