Electric vehicles can achieve low-speed four-wheel drive, but the reason many EVs don't offer a traditional low-speed 4WD mode (like those found in off-road internal combustion engine vehicles) is due to differences in drivetrain design and use cases.
Here are the main reasons:
Electric motors already provide high torque at low speeds:
Unlike internal combustion engines, electric motors deliver maximum torque almost instantly from zero RPM. This eliminates the need for a low-range gearbox to multiply torque for crawling at low speeds.
No traditional transfer case or gear reduction system:
Conventional 4WD vehicles use a transfer case with a low-range gear to reduce speed and increase torque. Most EVs use individual motors for the front and rear axles, and sometimes even for each wheel. These setups typically lack mechanical low-range gearing unless specially designed for off-road use.
Design priorities of most EVs:
Most electric vehicles are designed for urban and highway driving, not rugged off-roading. So manufacturers don't include a low-range 4WD system, which adds cost, weight, and complexity.
Software-based torque vectoring is used instead:
In dual-motor EVs, software can control power distribution between front and rear motors for traction, mimicking some functions of low-speed 4WD-but it's not the same as a mechanical low gear.
Conclusion:
EVs can technically implement low-speed 4WD through special gearing and motor control, and some off-road-focused electric trucks and SUVs (like the Rivian R1T or GMC Hummer EV) do offer features like "crawl mode" or terrain management. However, for most EVs, it's unnecessary due to the instant torque and different design philosophy compared to traditional 4WD systems.
