2026 GMC Terrain AT4: In-Depth Review, Start Up & Test Drive

Exterior Design and Features

• 🚀 The 2026 GMC Terrain AT4 makes a bold first impression with a large, upright grille and C-shaped LED headlamps, sharing design cues with GMC's truck and SUV lineup.
• 💡 The AT4 trim features exclusive elements like LED fog lamps, amber LED side markers, black trim, darkened chrome, and unique bumpers for a sportier look.
• ⛰️ It boasts improved approach, breakover, and departure angles (21.9°, 19.2°, and 23.1° respectively) due to unique bumper designs and increased ground clearance.
• 🛞 Standard 17-inch wheels with all-terrain tires provide better off-pavement grip, with optional 19-inch wheels available on other trims.

Performance and Driving Dynamics

• ⚙️ The AT4 is equipped with a new 8-speed automatic transmission paired with a 1.5L turbocharged 4-cylinder engine producing 175 horsepower and 203 lb-ft of torque.
• 🛣️ Acceleration to 60 mph takes approximately 9 seconds, offering adequate performance for daily driving and highway cruising.
• 📊 EPA estimated fuel economy ranges from 24 mpg city to 29 mpg highway, with the reviewer averaging around 26 mpg.
• 🏞️ The AT4 includes an exclusive terrain driving mode, standard all-wheel drive with hill descent control, and a selectable AWD system to decouple the rear axle for better efficiency.
• 🛑 Braking is handled by four-wheel disc brakes with Duralife rotors, offering good stopping power and improved corrosion resistance.

Interior Comfort and Technology

• 📱 A new 15-inch diagonal portrait-oriented infotainment system with Google Built-in is the interior's focal point, offering excellent response and high-res graphics.
• 🖥️ The driver information center spans 11 inches diagonally and offers configurable layouts, including full-width navigation and driver assistance views.
• 🔌 The interior features abundant storage, a floating center console design, wireless phone charging (standard on AT4), and USB-A and C ports.
• 💺 The AT4's interior combines cloth and core tech upholstery with Forest Storm and mahogany accents, featuring comfortable, eight-way power adjustable front seats with lumbar support.
• 🌡️ Dual-zone climate control is standard on the AT4, with basic physical toggles for quick adjustments and more in-depth controls accessible via the infotainment system.

Safety and Convenience Features

• 🚗 Standard safety features include enhanced automatic emergency braking, forward collision alert, lane keep assist, adaptive cruise control, and blind-zone alert.
• 📸 An optional HD surround vision camera system provides a 360-degree view of the vehicle's surroundings.
• 👨‍👩‍👧‍👦 The rear seat offers good accommodation for three passengers with a flat floor and ample head and legroom for a 5'10" individual.
• 📦 The AT4 and Denali trims come standard with a hands-free power liftgate that opens automatically upon approach.

Cargo Space and Practicality

• 🧳 Behind the rear seat, there are 29.8 cubic feet of cargo space, expandable to a maximum of 63.5 cubic feet when the 60/40 split rear seats are folded.
• 🛠️ The cargo floor can be removed for increased height capacity, and cargo hooks and LED lighting are provided for securing and illuminating the area.
• 🔗 The Terrain is trailering capable with a maximum capacity of 1,500 lb when equipped with all-wheel drive, including a trailer hitch and hitch guidance features on AT4 and Denali trims.
• ⛽ The fuel tank capacity is 15.6 gallons for AWD models and 14.8 gallons for FWD models.