P0717 — Input/Turbine Speed Sensor Circuit No Signal
Drivable short-term, but fix now to avoid damage.
What P0717 means
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.
Common symptoms
- Check Engine light is on
- Transmission in limp mode (stuck in one gear)
- Harsh, erratic, or no shifting
- Speedometer or shift behavior acting up
- Noticeable loss of power
Common causes
- Faulty input/turbine speed sensor
- Damaged wiring or corroded connector at the sensor
- Low or contaminated transmission fluid
- Internal transmission damage near the sensor
- Faulty transmission control module
Typical repair cost
$150 – $450
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0717 code?
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.
How much does it cost to fix a P0717?
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.
Is a P0717 code serious?
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.
What is the input/turbine speed sensor?
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.