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O'Neil GMC · Warminster, PA

2026 GMC Sierra 2500 HD SLT

6 miles · truck · Price dropped $4,510

PUBLISHED DEALER DETAILS

Complete vehicle specifications

Year2026
MakeGMC
ModelSierra 2500 HD
TrimSLT
Stock numberT851
Mileage6 miles
BodyPickup
Engine6.6L 8-cyl
Cylinders8
Displacement6.6L
TransmissionAutomatic
Drivetrain4WD
FuelGasoline
ExteriorSummit White
Towing16000

Vehicle description

Summit White 2026 GMC Sierra 2500HD SLT 4WD 10-Speed Automatic 6.6L V8 This 2026 GMC Sierra 2500HD SLT in Summit White features: Recent Arrival! O'Neil GMC in Warminster serving Philadelphia since 1965. See the rest of our inventory at ONEILGMC.COM.

Features & options (124)

  • Adaptive Cruise Control
  • Bluetooth®
  • Heated Steering Wheel
  • Remote Start
  • 4WD/AWD
  • Android Auto
  • Apple CarPlay
  • Leather Seats
  • Wi-Fi Hotspot
  • Auto Dimming Mirror
  • Emergency Brake Assist
  • Lane Departure Warning
  • Sunroof/Moonroof
  • Wireless Phone Charging
  • Blind Spot Monitor
  • Forward Collision Warning
  • Navigation System
  • Parking Assistance
  • Rear View Camera
  • Tow Hitch/Tow Package
  • Automatic Climate Control
  • Entertainment System
  • Premium Sound System
  • 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 (UET) In-vehicle Trailering App
  • Pickup bed includes bed assist step
  • Push Button Start
  • Transfer case, two-speed active, electronic Autotrac with push button control (Requires 4WD models.)
  • Auto-locking rear differential
  • Four wheel drive
  • Air filter, heavy-duty
  • Air filtration monitoring
  • Trailer brake controller, integrated
  • Recovery hooks, front, frame-mounted, Black
  • Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section
  • Suspension Package (Not available with (X31) Off-Road Package.)
  • Brakes, 4-wheel antilock, 4-wheel disc with DURALIFE rotors
  • Brake lining wear indicator
  • Wheels, 18" (45.7 cm) machined aluminum wheel with Dark Grey metallic accents
  • Tires, LT275/70R18E all-terrain, blackwall
  • Tire, spare LT275/70R18 all-terrain, blackwall
  • Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door
  • Bumper, front chrome lower
  • Bumper, rear chrome with bumper CornerSteps
  • Bed Step, Black integrated on forward portion of bed on driver and passenger side
  • CornerStep, rear bumper
  • Cargo tie downs (12), fixed, rated at 500 lbs per corner
  • Wheelhouse liners, rear
  • Moldings, beltline, chrome
  • Grille (Chrome surround with Chrome insert bars.)
  • Headlamps, Animated LED projectors LED turn signals and Daytime Running Lamps
  • IntelliBeam, automatic high beam on/off (Included and only available with (PDI) Sierra HD Pro Safety.)
  • Fog lamps, LED
  • 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
  • Taillamps, Animated LED Signature Tail, Stop, turn and Reverse lamps
  • Mirror caps, chrome
  • Glass, deep-tinted
  • Wipers, front rain-sensing
  • Door handles, chrome
  • Tailgate, standard
  • Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light
  • Tailgate and bed rail protection caps, top
  • SiriusXM Trial Subscription
  • Audio system feature, 6-speaker system
  • Bluetooth for phone connectivity to vehicle infotainment system
  • Wireless phone projection for Apple CarPlay and Android Auto
  • Wi-Fi Hotspot capable (Terms and limitations apply. See onstar.com or dealer for details.)
  • Seat trim, Perforated Leather-appointed front outboard seating positions
  • 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
  • Floor covering, color-keyed carpeting
  • Floor mats, carpeted front (Deleted when LPO floor liners are ordered or (BKF) Premium Floor Liners are ordered.)
  • Floor mats, carpeted rear (Deleted when LPO floor liners are ordered or (BKF) Premium Floor Liners are ordered.)
  • Steering wheel, wrapped
  • Steering wheel, heated
  • Steering wheel audio controls
  • Steering column, manual Tilt-Wheel and telescoping
  • Driver Information Center, enhanced, 12.3" diagonal reconfigurable multicolor digital display
  • Rear Seat Reminder
  • GMC Premium information Display- 13.4" diagonal Multicolor touch screen
  • Exterior Temperature Display, located in radio display
  • Compass, located in instrument cluster
  • 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 includes remote keyless entry
  • Remote vehicle starter system
  • Cruise control, steering wheel-mounted
  • Theft-deterrent system, unauthorized entry
  • Power outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)
  • USB Ports, 2, Charge/Data ports located on instrument panel
  • USB ports, (2) charge-only, rear
  • Power outlet, bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet)
  • Air vents, rear
  • Air conditioning, dual-zone automatic climate control
  • Defogger, rear-window electric
  • Mirror, inside rearview auto-dimming
  • Assist handles front A-pillar mounted for driver and passenger, rear B-pillar mounted
  • Front Pedestrian Braking (Included and only available with (PDI) Sierra HD Pro Safety.)
  • Automatic Emergency Braking (Included and only available with (PDI) Sierra HD Pro Safety.)
  • Daytime Running Lamps, LED signature lighting
  • LED Signature DRL's
  • OnStar Services capable (See onstar.com for details and limitations. Services vary by model. Service plan required.)
  • HD Rear Vision Camera (Removed with (UV2) HD Surround Vision.)
  • Hitch Guidance dynamic single line to aid in truck trailer alignment for hitching
  • Hitch Guidance with Hitch View with image adjustment, Pan/Zoom/Tilt
  • Forward Collision Alert (Included and only available with (PDI) Sierra HD Pro Safety.)
  • Following Distance Indicator (Included and only available with (PDI) Sierra HD Pro Safety.)
  • Lane Departure Warning (Included and only available with (PDI) Sierra HD Pro Safety.)
  • Rear Seat Belt Indicator
  • Seat Belt Adjustable Guide Loops, front row only
  • Tire Pressure Monitoring System, auto learn includes Tire Fill Alert (does not apply to spare tire)
  • Trailering Information Label provides max trailer ratings for tongue weight, conventional, gooseneck and 5th wheel trailering
  • DriveType: Four Wheel Drive
  • Fuel System: Direct Injection
  • Fuel Tank Capacity: 36 gal
  • Fuel Type: Gasoline Fuel
  • Horse Power: 401
  • Rear Wheel: Single
  • Trailering Capacity: 16000 lbs

Dealer-provided information may change. Confirm availability, price, vehicle condition, taxes and fees with the selling dealership.

AutosXchange Intel

Vehicle price analysis

Live listings · within 50 miles of Warminster, Pennsylvania
Asking price$72,070Dealer asking price · 6 mi
Market value$75,939Market value · based on 3 comparable cars
vs. market Good deal-5.1%Good deal · based on 3 comparable cars

Where this price sits

Among the lowest-priced · 100% of 3 similar listings ask more than this car.

$72,070lowest$75,980highest
Middle 50% of asking pricesMarket valueThis car

Price vs. market value

-5.1%
−25%Market value+25%
Good deal$3,869 below the market value of $75,939

Price range

$72,070
$72,070$75,980
Lowest price of 4 similar listings within 50 milesTick marks the market value · range of 3 similar listings

AutosXchange Insights

  • Compared with 3 new 2026 GMC Sierra 2500 SLT listings within 50 mi.
  • Priced $3,869 below the market value of 3 comparable cars.
  • Lowest price of 4 similar listings within 50 miles.
  • About 6 miles per year of age (U.S. average is roughly 12,000–14,000).
  • Stock # T851 — mention it when you call or text.

How we calculate market value: comparable cars for sale now plus their last listed prices.

Price history

Price tracked by AutosXchange since Nov 5, 2026. 1 price change at this dealership: $76,580 → $72,070 (−$4,510).

$70k$72k$74k$76k$78kNov 5Nov 6Nov 7Nov 9Nov 10Nov 11−$4,510 Nov 6

Market activity: O'Neil GMC raised prices on 3 2026 GMC Sierra 2500 HD AT4 by $490 each

AutosXchange Intel Hub: Price changes for this model in Pennsylvania · This model in the Intel Hub · Market movers in Pennsylvania

Dealer-advertised asking prices as observed by AutosXchange (data as of Nov 11); earlier listings at other dealerships are shown by state only. Source: AutosXchange Intel Hub, autos-xchange.com/market.

Cars this price is compared to

Same 2026 Sierra 2500 SLT · new · within 50 miles of Warminster, Pennsylvania. All 3 comparable cars for sale, nearest first.

More GMC Sierra 2500 near Warminster

All years and trims. Nearest first.