Drivable short-term, but fix now to avoid damage.
P0715 means the input or turbine speed sensor isn't sending a proper signal to the transmission computer. That sensor tells the computer how fast the input shaft is spinning so it can time gear changes. Without it, shifting becomes confused and the transmission may go into a protective limp mode.
$150 – $800
Varies by vehicle and root cause.
You can usually drive short distances, but it's not ideal. The transmission may shift roughly or go into limp mode, which is stressful on the gearbox, so head to a shop sooner rather than later.
If it's just the sensor and wiring, expect roughly $150-$400. If the sensor is hard to reach or fluid work is needed, the cost can rise toward $800.
Yes, it's considered high severity because it directly affects shifting and can put the transmission into limp mode. Driving on it for long can lead to bigger transmission problems.
It measures how fast the transmission's input shaft is turning so the computer knows when and how to shift. When it fails, the computer loses that information and shifting quality suffers.