The 2024 GMC Sierra 2500HD AT4 in Onyx Black is a heavy-duty truck designed for capability, comfort, and advanced technology. With its 6.6L V8 engine, 10-speed automatic transmission, and off-road-ready AT4 suspension, the Sierra 2500HD combines rugged performance with refined interior features. The cabin is equipped with premium materials, advanced infotainment, and thoughtful storage solutions for both work and adventure.
Engine & Performance
• 6.6L V8 gas engine with direct injection and variable valve timing
• 401 hp @ 5200 rpm, 464 lb-ft of torque @ 4000 rpm
• Allison 10-speed automatic transmission with tow/haul mode
• Four-wheel drive with auto-locking rear differential
• Off-road suspension with twin-tube shocks and skid plates
• Hill descent control and integrated trailer brake controller
Exterior Features
• Onyx Black finish with body-color bumpers and mirrors
• 20" high-gloss black aluminum wheels with LT275/65R20 all-terrain tires
• MultiPro tailgate with six functional load/access features
• LED headlamps, fog lamps, animated taillamps, and cargo bed lighting
• Bed assist step, bedliner, and corner steps on rear bumper
• High-gloss black mirror caps and beltline moldings
Interior & Comfort
• Dual-zone automatic climate control and rear air vents
• Heated and ventilated front seats with 10-way power adjusters
• Heated second-row outboard seats and full under-seat storage
• Premium floor liners with removable carpet inserts
• Center console with cup holders, storage, and hanging file folder capability
• Leather seating with perforated front seats and rear 60/40 bench with fold-down armrest
Technology & Safety
• 13.4" diagonal premium GMC infotainment with Google built-in apps
• Wireless Apple CarPlay and Android Auto, Bluetooth, and USB ports
• Rear-seat reminder, remote vehicle starter, push-button start, and keyless entry
• Digital variable steering assist with heated steering wheel
• Enhanced 12.3" driver information center display with driver memory presets
• Wi-Fi hotspot capable and OnStar connected services
Additional Details
• Capless fuel fill and auxiliary 120V power outlets in bed and cabin
• Cargo tie-downs rated at 500 lbs per corner
• Rear recovery hooks in red
• Front and rear high-tensile brake system with Duralife rotors
• LT275/70R18 spare tire with keyed carrier lock
• Rain-sensing front wipers and wireless phone charging