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 combines diesel pulling power with refined appointments and smart systems, delivering confident capability and efficient long-distance performance.
AT4 Value Package adds thoughtful upgrades that enhance everyday usefulness and give the truck a more finished, better-equipped feel without overcomplicating things.
Technology Package brings a clearer view around the vehicle and richer driver information, making parking, hitching, and tight maneuvers easier and less stressful.
Driver Alert Package II helps maintain safe highway habits by assisting with speed, following distance, and lane-keeping so long drives feel calmer and more controlled.
AT4 CarbonPro Edition increases durability where it counts, giving the Sierra tougher, work-ready materials that reduce worry on heavy-use days without sacrificing capability.
Driver Alert Package I focuses on low-speed awareness and collision warnings so city traffic, lane changes, and reversing are more confident and less nerve-wracking.
AT4 Preferred Package delivers comfort and convenience upgrades that soften daily driving choresâ"better audio, charging, and simple luxuries that make the cab more inviting.
Preferred Equipment Group 4SB ties towing and utility features together so trailering tasks, service reminders, and reverse-assist guidance work in harmony for smoother hauling.
Smart device mirroring keeps your phoneâs essential apps accessible through the infotainment screen so you can use navigation and media with fewer distractions.
Adaptive cruise control eases highway duties by managing speed and spacing automatically, reducing fatigue and helping you maintain a safe following distance.
Forward collision mitigation watches the road ahead and can prepare the truck to respond if traffic suddenly slows, providing an added layer of proactive protection.
Front pedestrian impact prevention enhances detection of people near the roadway and can intervene to help avoid collisions in busy or unpredictable environments.
Rear camera provides a clearer view when backing or lining up a trailer, making close-quarters maneuvers safer and more precise.
Mobile hotspot keeps passengers and devices connected on the go, which is handy for job sites, family trips, or staying productive between stops.
Head-up display projects key driving information into your sightline so you can keep attention on the road while still monitoring speed and alerts.
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