In the course of a normal vehicle's development, engineers maximize capability while avoiding excessive size, mass, and cost. Heavier, taller, and longer vehicles steer more clumsily, accelerate more slowly, roll more noticeably, and consume more fuel. GMC markets the Sierra EV as a light-duty truck, yet it weighs close to 9,000 pounds empty—more than a Sierra 3500 HD with dual rear wheels. So the Sierra EV rides on a heavy-duty suspension with eight heavy-duty lug nuts on each wheel and each tire filled to a heavy-duty 60 psi. Yet, it can tow up to only 12,500 pounds. That's great for a light-duty but a mere third of what a 3500 HD can pull. The payload is skimpier than a midsize truck's, at only 1,500 pounds with the Max Range battery. In AT4 trim, with a two-inch lift, it stands six feet, eight inches tall. Tow hook to trailer hitch, you're looking at nearly 20 feet of truck.
The Sierra EV's physical heft should equate to disastrous results but, on the contrary, the driving experience is practically faultless. Two electric motors deliver more midrange torque than any diesel, and with anywhere from 605 to 760 horsepower, the Sierra EV slingshots into traffic like a supercharged Camaro. Traction and roadholding are akin to a midsize three-row SUV, not a mammoth truck. Unlike the undersized rotors on most GM trucks, braking is exceptional—a panic stop, even on all-terrain tires, was delivered smoothly and assuredly. Body lean, pitch, and dive are controlled and mitigated like on a sporty crossover whether you choose the trail-tuned AT4 or the air-sprung Denali Reserve.
Maneuverability is equal to a midsize sedan. The rear wheels turn in the opposite direction at low speeds, which makes for easy U-turns and quick parking even in the tightest lots. The ride is serene, and the suspension crashes on big bumps only if you're driving on the Denali Reserve's giant 24-inch wheels. Even then, there are no harsh, bone-shaking impacts like you'll feel in unladen heavy-duty trucks. This is an extreme vehicle that turns every dial to the max, and yet walking on that knife edge of high performance doesn't cause it to fall apart or upset its poise in any way.
We didn't test the AT4 off-road. Its 10-inch ground clearance is impressive, but its approach, breakover, and departure angles are worse than those of the internal-combustion Sierra 1500 AT4X. The Crab Walk diagonal-steering feature from the GMC Hummer EV is now standard, but all it does is induce motion sickness. The effect is like pushing a shopping cart on four loose wheels—you can't point it reliably in any direction and hope to get there. The four-wheel steering is where the fun is at, not Crab Walk.
What about the downsides of owning an EV? The Max Range battery is so large that at 50 percent charge, the Sierra EV has another 200 miles of range left. Our testing in 80-degree weather allowed us to run 390 miles on a single charge (from 100 percent to 12 percent). Run all the way down, we would have seen 440 miles. That’s slightly short of GMC's 478-mile estimate, but without even attempting to conserve energy on a fast highway, with up-hill climbs and the A/C blasting, our results were incredible. And this is not some slippery, low-slung sedan or coupe. It's a brick in the wind, albeit rounded on the edges but a hard brick nonetheless.
In cold weather, when we tested a 2024 Sierra EV Denali Edition 1, our range was only about 300 miles. But since then, GMC has made numerous tweaks to the powertrain and software, which has improved range significantly. Now that fast-charge stations are finally becoming reliable and more plentiful, the Sierra EV makes long distance cruising enjoyable. It's the best electric vehicle, period. We only needed a huge truck with a battery that's as heavy and expensive as a small car, but GMC got us here.
For 2026, there are three battery choices. The Standard Range (283 miles) is standard on the base Elevation and the Denali. The Extended Range is standard on the AT4 (390 miles) and optional on the Elevation and Denali (410 miles). The Max Range is optional on either the AT4 or Denali (478 miles). DC fast-charging rates vary by battery. Only the Max Range can take up to 350 kW, while the Extended Range and Standard Range are 300 kW and 220 kW, respectively. In New England, fast-charging at upwards of 64 cents per kWh makes it no cheaper than running a diesel. Your rates may vary (especially at home) but 205 kWh is a huge amount of energy to replenish.