2024 GMC Sierra 2500HD AT4 Duramax 4WD for Sale in Longmont, CO

Looking for a used heavy-duty diesel truck in Longmont, Boulder County, or Northern Colorado? This 2024 GMC Sierra 2500HD AT4 combines serious towing and hauling capability with premium comfort, advanced technology, and off-road performance. Finished in Silver and offered as an Accident-Free CARFAX Local Trade, this Duramax-powered Sierra 2500HD AT4 is ready for Colorado jobsites, towing, mountain adventures, and everyday driving.

Key Features:
ACCIDENT-FREE CARFAX
LOCAL TRADE
DURAMAX 6.6L V8 TURBODIESEL
470 HORSEPOWER / 975 LB-FT OF TORQUE
10-SPEED AUTOMATIC TRANSMISSION
4WD / 4X4 / FOUR-WHEEL DRIVE
2-SPEED ACTIVE TRANSFER CASE
AT4 OFF-ROAD SUSPENSION
AT4 PREMIUM PLUS PACKAGE
TOW PACKAGE & INTEGRATED TRAILER BRAKE CONTROLLER
5TH-WHEEL & GOOSENECK TRAILER PROVISIONS
ADAPTIVE CRUISE CONTROL
LANE DEPARTURE WARNING
BLIND SPOT MONITOR
REAR CROSS TRAFFIC ALERT
AUTOMATIC EMERGENCY BRAKING
HEATED & VENTILATED LEATHER SEATS
10-WAY POWER FRONT SEATS WITH LUMBAR
HEATED REAR SEATS
HEATED STEERING WHEEL
POWER SUNROOF
15-INCH MULTICOLOR HEAD-UP DISPLAY
GMC NAVIGATION & PREMIUM INFOTAINMENT
APPLE CARPLAY & ANDROID AUTO
BOSE PREMIUM 7-SPEAKER AUDIO
SiriusXM with 360L
BED VIEW CAMERA & TRAILER CAMERA PROVISIONS
FRONT & REAR PARK ASSIST
POWER-RETRACTABLE ASSIST STEPS WITH LED LIGHTING
SPRAY-ON BEDLINER WITH AT4 LOGO
REMOTE START, KEYLESS ENTRY & PUSH BUTTON START

At the heart of this GMC Sierra 2500HD AT4 is the legendary Duramax 6.6L V8 Turbodiesel, producing an impressive 470 horsepower and 975 lb-ft of torque. Paired with a 10-speed automatic transmission and 4WD with a 2-speed active transfer case, this heavy-duty pickup provides the strength and control needed for serious towing, hauling, off-road driving, and demanding work.

The AT4 Premium Plus Package adds premium capability and technology, including an off-road suspension, power sunroof, Technology Package, and exclusive AT4 high-clearance step. Whether you're working around Longmont and Boulder County, towing through Northern Colorado, or heading toward the mountains, this Sierra is engineered to handle challenging conditions.

Inside, the cabin delivers impressive comfort with perforated leather seating, heated and ventilated front seats, 10-way power adjustment with lumbar support, heated rear seats, and a heated steering wheel. The spacious interior makes this Sierra equally comfortable for long workdays and extended road trips.

Advanced technology includes GMC navigation, Apple CarPlay, Android Auto, wireless phone projection, a 15-inch multicolor Head-Up Display, Bose Premium 7-Speaker Audio, and SiriusXM with 360L. The Head-Up Display keeps important information in your line of sight while driving.

Towing and hauling are a major strength. The integrated trailer brake controller, hitch guidance, 5th-wheel and gooseneck provisions, bed view camera, trailer camera provisions, spray-on bedliner, cargo tie-downs, and power-retractable assist steps make this Sierra 2500HD ready for serious work and recreation.

If you're searching for a used GMC Sierra 2500HD, Duramax diesel truck, Sierra AT4, heavy-duty pickup, 4WD truck, 4X4, towing truck, work truck, or diesel pickup near Longmont, Boulder, Erie, Lafayette, Louisville, Niwot, Loveland, or throughout Northern Colorado, this 2024 GMC Sierra 2500HD AT4 Duramax deserves a closer look.

Visit Fowler Longmont Honda in Longmont, Colorado, to see this Sierra 2500HD AT4 in person and schedule your test drive. Browse our website for current inventory, pricing, financing options, and more quality used trucks, SUVs, cars, and heavy-duty pickups serving Longmont, Boulder County, and Northern Colorado.