New spy photos reveal critical details of the upcoming 2027 GMC Sierra 1500, signaling a significant update for General Motors’ full-size truck lineup. The images showcase both exterior and interior changes, confirming key features like a large horizontal touchscreen, physical controls, and continued availability of a diesel engine option.
Design and Exterior Updates
The next-generation Sierra will differentiate itself from the mechanically similar Chevrolet Silverado with unique styling cues. Visible in the spy shots is a distinctive grille design, altered lighting configurations, and muscular flared fenders – a design trait borrowed from the mid-size GMC Canyon and the electric Sierra EV. The hood also features a central power bulge, unlike the Silverado’s dual-bulge configuration.
Both trucks will retain integrated rear bumper steps and a multifunction tailgate. The test vehicle appears to be a high-end Denali trim, equipped with power running boards and 22-inch Bridgestone Alenza tires. While GM patents leaked last year offered an early glimpse of the Silverado, the Sierra’s final design remains largely under wraps.
Interior Features: Physical Buttons Remain
A standout feature revealed in the spy photos is the retention of physical controls in the cabin. Despite the expected large dash-mounted touchscreen, GMC is keeping a physical volume knob, column-mounted electronic shifter, and a row of toggle switches for essential functions. This is a departure from some industry trends favoring fully digital interfaces. The driver also faces a digital gauge cluster, positioned alongside the landscape-oriented touchscreen.
Why this matters: Consumers have voiced frustration with overly complex, touch-heavy interfaces in modern vehicles. Retaining physical controls improves usability and reduces driver distraction.
Powertrain Options: Diesel and New V-8 Engines
The Sierra will continue to offer a diesel engine option, confirmed by a “diesel” sticker on the steering wheel of the test vehicle. The current Duramax 3.0-liter straight-six, producing 305 horsepower and 495 pound-feet of torque, may carry over or receive upgrades. In addition to the diesel, GM is preparing a new small-block V-8 engine in two displacements: 5.7 liters and 6.6 liters.
The persistence of a diesel option reflects continued demand from truck buyers who prioritize towing capability and fuel efficiency. The inclusion of new V-8 variants suggests GM is maintaining a broad powertrain portfolio to cater to diverse consumer preferences.
Launch Timeline
GM is preparing to launch the new generation of its full-size pickup trucks later this year. Further details regarding the Sierra, Silverado, and their powertrains are expected to be revealed in the coming months.
The 2027 GMC Sierra 1500 represents a measured evolution rather than a radical overhaul, balancing modern technology with practical usability. The combination of updated styling, retained physical controls, and familiar powertrain options positions the Sierra as a competitive offering in the full-size truck segment.
