P0717 code meaning
Input/Turbine Shaft Speed Sensor A Circuit No Signal
Powertrain system Generic code P07xx codes Check engine light
What P0717 means
The input or turbine shaft speed sensor – a Hall sensor with square-wave output or an inductive sensor with sine output – reports the speed behind the torque converter. With output and engine speed it gives the actual gear ratio, converter slip and shift timing. P0717 means there is practically no input speed signal although the vehicle is driving under power. GM's 2025 modules flag under 200 rpm for more than 4 s with torque applied, the 6T70 under 50 rpm for 5 s, the Allison 1000 under 61 rpm with output above 500 rpm; Ford under 200 rpm for 5–30 s; all after one trip. GM calls it 'circuit low voltage', but means missing frequency. On GM's 10-speed both input and output sensors share a supply – P0717 together with P0722 points to that supply rather than two sensors.
P0717 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0717
- Check engine and/or transmission warning lamp
- Limp mode with fixed gear, harsh shifts
- Torque converter clutch does not apply
- Input speed shows 0 or implausible in the scan tool
Common causes of P0717
- Most likelySpeed sensor faulty (Hall IC or coil open or shorted)
- Most likelyConnector or harness corroded, chafed or loose pins (with internal sensors also the pass-through connector)
- PossibleMetal debris on the sensor magnet or damaged reluctor wheel
- Less likelyTransmission module or its sensor supply faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Input speed sensorSensor wiringTransmission control module
What each part of P0717 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7 | Area: transmission. |
| 17 | The exact fault in that area. |
What to do next
- Note P0717 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0717
What does P0717 mean?
P0717 means "Input/Turbine Shaft Speed Sensor A Circuit No Signal". The input or turbine shaft speed sensor – a Hall sensor with square-wave output or an inductive sensor with sine output – reports the speed behind the torque converter. It is a generic code, so it means the same on every make.
Is it safe to drive with P0717?
Drive gently and only to a workshop. With P0717 the car can go into limp mode (reduced power) to protect itself.
Will P0717 fail an emissions test?
Yes, it can. P0717 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0717 to fix?
Difficulty: hard. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0717 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.