Pre-Owned 2021 GMC Sierra 1500 AT4 4x4

2021 GMC Sierra 1500 4WD Crew Cab 147 AT4 â€" AT4 Value Package, Technology Package, Driver Alert Package II, AT4 CarbonPro Edition, Driver Alert Package I, AT4 Preferred Package, Preferred Equipment Group 4SB â€" Duramax 3L I-6 diesel direct injection, DOHC, variable valve control, intercooled turbo engine with 277HP paired to a 10-speed automatic transmission. This AT4 blends diesel pulling strength with refined on-road manners and efficient long-distance fuel economy for confident towing and comfortable highway miles.

AT4 Value Package delivers practical, no-fuss improvements that make the truck feel more complete and useful for everyday tasks without overcomplicating the setup.

Technology Package enhances visibility and driver information so parking, hitching and tight maneuvers are easier and less stressful thanks to richer camera views and displays.

Driver Alert Package II brings highway-oriented assistance that helps manage speed, following distance and lane position so long trips feel calmer and safer.

AT4 CarbonPro Edition adds tougher materials where it matters, increasing resilience during heavy-duty use so the Sierra stays functional and dependable on demanding jobs.

Driver Alert Package I raises low-speed awareness with collision warnings and proximity aids to make city driving, lane changes and reversing more confident.

AT4 Preferred Package packs comfort and convenience upgradesâ€"improved audio, wireless charging and small luxuries that make the cabin more welcoming on daily drives.

Preferred Equipment Group 4SB ties together trailering and utility upgrades so towing tasks, service reminders and reverse-assist guidance work in harmony for smoother hauling.

Smart device mirroring brings your phone’s navigation and apps onto the Sierra’s infotainment screen, helping you manage directions and media with fewer distractions.

Forward collision mitigation constantly monitors the road ahead and can prepare the vehicle’s systems if an imminent impact is detected, adding proactive protection.

Front pedestrian impact prevention improves detection of people near the roadway and can take steps to avoid or reduce pedestrian collisions in busy or unpredictable environments.

Mobile hotspot provides on-the-go internet for passengers and devices, keeping work, streaming and navigation connected without using up phone data.

Rear camera gives a clearer view when backing or lining up a trailer, turning tight reverse maneuvers into safer, more precise operations.

Lane departure prevention helps correct unintended lane drift, giving an extra layer of support to keep the truck centered and reduce lane-exit risks.

Adaptive cruise control automatically adjusts speed to maintain a safe gap from the vehicle ahead, easing fatigue and improving highway driving comfort.