2021 GMC Sierra 2500HD AT4

About this truck

This 2021 GMC Sierra 2500HD AT4 in eye-catching Red delivers serious capability paired with refined comfort. Built on the legendary Duramax 6.6L V8 Turbodiesel engine with a 10-speed automatic transmission and confident 4WD, this truck is engineered for demanding work and weekend adventures alike. The Jet Black interior with Kalahari accents and premium leather seating creates a commanding driving environment that feels both rugged and luxurious.

• Duramax 6.6L V8 Turbodiesel engine with 10-speed automatic transmission
• Power-retractable assist steps in black and AT4 premium package
• Gooseneck/5th wheel package with integrated trailer brake controller
• Heated and ventilated front bucket seats with leather trim
• HD surround vision with bed view camera and 2 trailer camera provisions
• Multicolor 15" head-up display with 4G LTE Wi-Fi hotspot capability
• Premium GMC infotainment system with Apple CarPlay and Android Auto
• Remote vehicle starter system with keyless open and start
• Lane departure warning and rear cross traffic alert systems
• Active transfer case with off-road suspension and hill descent control

This AT4 combines premium technology with heavy-duty performance. Features like the wireless charging pad, heated steering wheel, and climate-controlled seating deliver daily comfort, while the trailer tire pressure monitor sensors, integrated trailering system app, and hitch guidance with hitch view make towing intuitive and safe. The truck's sophisticated safety suite—including automatic emergency braking, lane change alert with side blind zone detection, and ultrasonic park assist—provides peace of mind on every drive. With nearly 140,000 miles, this Sierra remains a trusted workhorse ready for your next chapter. We invite you to experience this impressive 4WD diesel truck firsthand—schedule your visit today and discover why the AT4 is the ultimate blend of luxury and capability.