Can You Drive With Low, Leaking or No Transmission Fluid
A transmission can lose fluid through a leak, a failed seal, or a damaged cooler line, and the question of whether the car can still move depends on how much remains and how the unit is loaded. With no fluid, most automatic and many manual transmissions cannot generate proper hydraulic pressure or carry away heat for any meaningful drive. Even a short trip can turn a repairable leak into a failed geartrain, so the condition should be assessed before the engine is started again.
Direct answer
Driving with no transmission fluid is not safe for the transmission. In an automatic, the fluid is the working medium that applies clutches and bands, lubricates the planetary gearset, and cools the valve body. Without it, the pump may spin dry and the friction surfaces can weld or burn within a short distance. You may be able to start the engine and idle briefly, but shifting into gear or moving the vehicle greatly increases the chance of immediate internal damage.
A low fluid level is slightly different from an empty case. If the level is only a little below the dipstick range, the transmission may still engage, but it can slip, delay gear changes, or shudder because line pressure drops during turns and stops. A car that is actively leaking transmission fluid may run until the level falls too far, especially if the leak is at a cooler line or pan gasket. The safe answer is to tow the vehicle or top up after confirming the leak, rather than test how far it will go.