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Code P0717: Symptoms, diagnosis and causes

 

P0717 is a somewhat rare OBD2 fault code. While the check engine light comes on, the code warns of a transmission-related error, namely that the input shaft/turbine speed sensor is not sending a signal.

Although P0717 is a generic code (it has the same meaning for any vehicle manufactured after 1996), it is most commonly seen on Toyota, Nissan and GM vehicles.

OBD2 code P0717


P0717 Definition: Turbine Speed ​​Sensor/Input – Circuit “A” No Signal

This is the meaning of P0717 broken down into its two main parts.

Turbine Speed ​​Input/Sensor

The input/turbine speed sensor measures the speed of your vehicle’s input shaft. It does this by measuring the speed of a reluctant wheel using electromagnets.

The reluctant wheel has some notches. By rotating the input shaft, the input/turbine speed sensor can tell each time it passes one of these notches.

It transmits this data to the ECU or TCM, which determines the speed of the input shaft. Your car or truck’s PCM then compares this data to the engine RPM, output shaft speed sensor, and vehicle speed.

The input speed sensor is usually bolted or attached to the transmission. It will be close to the crankcase since it measures the rotational speed of the torque converter.

circuit “A” no signal

With P0717, there is no voltage from the turbine speed input/sensor. If the loss of voltage were intermittent, the code would be P0715.


P0717 Symptoms

These are the most common symptoms associated with P0717:

  • The torque converter does not lock
  • Transmission goes into limp mode
  • The speedometer not working properly
  • Difficult gear change
  • Transmission does not shift at normal RPM

Depending on the transmission in question, symptoms can range from uncomfortable to impossible to drive.


P0717 Causes + Diagnosis

P0717 Fix

The good news is that with P0717 there are not many common causes, and the solution is usually quite simple. Here we explain how to diagnose this code:

1. Check the wiring harness (probably)

The wiring harness is where you’ll want to start looking for causes of P0717. Check for damaged wiring, especially where the wiring harness connects to the turbine input/speed sensor.

Do the pins appear free of corrosion? They may need cleaning to make good contact. Use an electrical contact cleaner.

Check that the ground connection is solid. If there doesn’t appear to be any visible damage, you can check the voltage with a voltmeter.

Repair the wiring harness as necessary.

2. Input speed sensor (very likely)

Now that you’ve verified that the wiring to the turbine/input speed sensor is working, it’s likely that the sensor itself is malfunctioning and causing P0717.

If you remove the sensor, check that there are no metal shavings on its magnetic tip. If there are, that may be enough to disrupt the signal. You can try cleaning the chips and see that the sensor works again.

Use a voltmeter to check the voltage entering and leaving the sensor. Otherwise, you may end up replacing a sensor that is still working well.

Pull this sensor when the transmission is cold to avoid burning hot ATF.

3. PCM (Not very likely)

It is possible that the PCM is to blame. Only suspect it if the sensor and wiring seem fine. Check that there are no technical service bulletins related to the PCM from your vehicle manufacturer.


Conclusion

Although it is difficult to drive with P0717, fixing it is relatively simple. Good luck!

 

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