Drivable short-term, but fix now to avoid damage.
P0717 means the transmission control module is receiving no signal from the input (turbine) speed sensor. This sensor tells the computer how fast the transmission input shaft is spinning, which is essential for timing gear changes. Without it, the transmission often goes into limp mode to protect itself, causing harsh shifts or being locked in one gear.
$150 – $450
Varies by vehicle and root cause.
It's best not to. The transmission usually drops into limp mode with limited power and won't shift normally, which can be unsafe in traffic. Drive only a short distance to a shop or have it towed.
Replacing the speed sensor and repairing wiring typically runs about $150 to $450. Costs climb if the problem is internal to the transmission and requires deeper teardown.
Yes, this one is on the more serious side. The transmission can't shift correctly without the sensor signal, so it should be diagnosed and fixed right away to avoid being stranded or causing further damage.
It measures how fast the transmission's input shaft spins. The computer uses that reading to decide when to shift, so when the signal disappears, the transmission protects itself by going into limp mode.