2025 GMC Sierra 1500HD Reviews, Interior, Release Date
2025 GMC Sierra 1500HD Reviews, Interior, Release Date – As one of the best-selling vehicles in North America, the GMC Sierra 1500 has an extensive price range, with more than $50,000 separating the base trim from the cream of the crop. And while the decked-out Denali Ultimate trim makes sense for shoppers looking for luxury, the 2025 GMC Sierra 1500HD brings with it added aggression and off-road prowess while delivering an astoundingly comfortable ride.
2025 GMC Sierra 1500HD Redesign and Update Plan
Exterior and Interior
With unique springs accompanying Multimatic’s magnetorheological shocks, the Sierra AT4X has excellent suspension damping for both street and off-road situations. By comparison, the Denali Ultimate’s adaptive dampers can’t match the body control of this Canadian-made suspension over bumps and bruises on the road.
The AT4X rides relatively firmer in most situations; when driving on pothole-ridden roads, loose gravel, or washboard dirt surfaces, occupants can count on rock-solid stability and minimal commotion filtering through to the passenger cabin. In fairer weather, it loves eating up the miles – er, kilometres – as competently as any luxury car.
The interior is finished similarly to the Denali Ultimate, minus a few garnishing touches. Seating surfaces are full-grain leather with ventilation up front and with heating for outboard passengers in the rear. Long driving stints without fatigue are straightforward thanks to front seat massagers and the great ride quality. Kudos to General Motors (GM) for buttons that enable the front-seat heat to be isolated to the seatbacks, relieving soreness without toasted buns to go with it.
2025 GMC Sierra 1500HD Specs
Aside from its rugged good looks, the Sierra AT4X has a few more party tricks that make it more than just a pretty face. Proper electronic locking front and rear differentials are class-exclusive; not even the Ford F-150 Raptor or Ram 1500 TRX get them. There’s also a selectable terrain mode, which can modulate throttle and brake controls for precise one-pedal operation when crawling off-road.
Engine and Performance
There’s only one powertrain available with the Sierra AT4X package – a 6.2L V8 paired with a 10-speed automatic transmission. (Other trims get the option of a diesel, but that’s not the case here, unfortunately). With 420 hp and 460 lb-ft of torque, the AT4X merges and passes quickly and lets out a satisfying burble as it sweeps through the rev range. The transmission makes the most of the power on tap with a small amount of gear hunting and a bit of unrefined jerkiness at low speeds. For torque lovers who insist on diesel, the regular AT4 can be so equipped.
2025 GMC Sierra 1500HD Fuel Economy
While half-ton trucks aren’t noted for their fuel economy, those riding on mud-terrain tires will are notably worse due to increased rolling resistance. With Natural Resources Canada (NRCan) ratings of 16.7 L/100 km in the city and 14.0 on the highway, this test saw an observed 14.8 in mostly highway driving, including plenty of winter-time remote-start idling. To twist the knife a little more, premium fuel (91 octane or better) is recommended.
Cylinder deactivation allows for exceptional highway mileage that can above the quoted values while driving at speeds of 80 to 90 km/h. Still, as you reach triple-digit speeds, a lot of this is mooted. A less aggressive wheel and tire package, improved aerodynamics with a lower ride height, and other factors surely contribute to these results. 2025 GMC Sierra 1500HD Reviews
Against its peers, fuel economy is marginally worse than the turbocharged V6 of the Ford F-150 Raptor and is handily worse than the hybrid Toyota Tundra TRD Pro. However, it isn’t the worst in its class; that title goes to the much more powerful Ram 1500 TRX that gets 22.4 L/100 km in the city and 16.5 on the highway (yikes).
2025 GMC Sierra 1500HD Safety Features
On the safety front, several driver-assist features help to keep the Sierra AT4X between the lines. There’s adaptive cruise control, forward collision warning with automatic braking, front and rear pedestrian detection, camera-based hitch guidance, a 360-degree camera system, a vibrating safety alert seat, and parking sensors on the front and rear bumpers. GM’s semi-autonomous Super Cruise system is not available on the AT4X and is reserved only for the Denali and Denali Ultimate.
For drivers with young children, the child seat anchors are reasonably easy to access. With the extra ride height and only a tubular steel rocker guard instead of a proper running board, loading rear-facing babies and toddlers can be awkward. A proper running board would solve this issue at the expense of some off-road ground clearance. 2025 GMC Sierra 1500HD Reviews
2025 GMC Sierra 1500HD Price and Release Date
The AT4X starts at $98,703, and with the AEV Edition package mixed in with a few other incidental options, the as-tested price balloons to $109,038 with destination fees and A/C tax. In addition to competing with the Denali Ultimate, the GMC finds itself right in the crosshairs of the renowned Ford F-150 Raptor, which gets more output (450 hp and 510 lb-ft of torque) and arguably more brand recognition. A comparably equipped Ram 1500 TRX is about $15,000 more, but 702 hp and 650 lb-ft greets you in return. Meanwhile, the Toyota Tundra CrewMax Limited TRD Pro is nearly $20,000 cheaper but isn’t as nice as a truck. 2025 GMC Sierra 1500HD Reviews
