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, offering diesel torque with fuel-conscious highway manners. This AT4 blends rugged capability with refined technology and safety to make towing, trailering and daily driving more confident and comfortable.
AT4 Value Package enhances everyday usefulness so the truck is better prepared for work and play without adding unnecessary complexity.
Technology Package elevates visibility and situational awareness, giving you clearer camera angles and smarter displays that simplify parking, hitching and tight maneuvers.
Driver Alert Package II brings advanced highway aids that help manage distance, speed and lane position, reducing fatigue on long drives and improving overall confidence behind the wheel.
AT4 CarbonPro Edition adds more durable materials where it matters most, increasing resistance to wear and protecting the bed and body during heavy-duty use.
Driver Alert Package I focuses on low-speed confidence with extra warnings and sensors that make lane changes, backing up and working in tight spaces less stressful.
AT4 Preferred Package injects creature comforts and premium touchesâ"better audio, wireless charging and convenience featuresâ"so daily commutes and long trips feel more enjoyable.
Preferred Equipment Group 4SB bundles trailering and utility tools that simplify hooking up, monitoring and maintaining trailers for more predictable towing experiences.
Smart device mirroring brings your phoneâs navigation and entertainment into the Sierraâs infotainment system so you can access maps and media with fewer distractions.
Forward collision mitigation constantly scans ahead and prepares the vehicle to intervene when a frontal impact becomes likely, helping to prevent or reduce collision severity.
Front pedestrian impact prevention extends that forward-looking protection to people on the road, assisting to detect and avoid pedestrians when possible.
Mobile hotspot keeps passengers and devices connected through the truckâs private network so work, streaming and navigation stay online without burning personal data.
The rear camera and expanded camera views improve reversing and trailer hookups, giving clearer imagery of blind spots behind and around the truck.
Lane departure prevention helps keep the Sierra centered in its lane by alerting or correcting unintended drifts, adding an extra layer of highway safety.
Adaptive cruise control acts like a smart co-pilot by maintaining your chosen speed while adjusting distance to
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