During 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 more than 4,000 kilograms (close to 9,000 pounds) empty. That’s more than a Sierra 3500 HD with dual rear wheels.
So, the Sierra EV rides on a heavy-duty suspension with eight equally heavy-duty lug nuts on each wheel and each tire filled to an again heavy-duty 60 psi. Yet, it can tow only up to 5,660 kilograms (12,500 pounds). That's great for a light-duty but a mere third of what a 3500 HD can pull. The payload is also skimpier than a midsize truck’s at a mere 680 kilograms (1,500 pounds) with the Max Range battery. In AT4 trim, with a five-centimetre lift, it stands more than two metres tall. Tow hook to trailer hitch, you're looking at nearly six metres 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 mid-range 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, delivers smoothly and assuredly. Body lean, pitch, and dive are controlled and mitigated as though it were a sporty crossover, whether you choose the trail-tuned AT4 or the air-sprung Denali Reserve.
Maneuverability is equal to a midsize sedan’s. 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 25.5-centimetre 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 available, 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 roughly 300 kilometres of range left. Our testing in 27-degree weather allowed us to run 627 kilometres on a single charge (from 100 percent to 12 percent). Run all the way down, we would have seen 708 kilometres. That’s slightly short of GMC's 769-kilometre estimate, but without even attempting to conserve energy on a fast highway, with uphill 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—rounded at 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 480 kilometres. But GMC has since made numerous tweaks to the powertrain and software, which have 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. In Canada, the Standard Range (455 kilometres) is standard only with the base Elevation trim. The Extended Range is standard on the AT4 and optional with the Elevation and the Denali (620 to 660 kilometres, depending on trim and configuration). The Max Range is optional either with the AT4 or the Denali (769 kilometres). 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. Your electric rates may vary, especially at home, but 205 kWh is a huge amount of energy to replenish.