P0717 is a somewhat rare OBD2 trouble code that can appear on the Nissan Pathfinder. 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.
P0717 is a generic code (it has the same meaning for any vehicle manufactured after 1996).
P0717 Definition: Turbine Speed Sensor/Input – Circuit “A” No Signal
Here is the meaning of P0717 broken down into its two main parts.
Turbine Speed Input/Sensor
Your Pathfinder’s input/turbine speed sensor measures the speed of the input shaft. To do this, use a reluctant wheel and some magnets (the magnets are on the tip of the sensor)
The reluctant wheel has some notches. When the input shaft rotates, the input/turbine speed sensor can tell each time it passes one of these notches.
It transmits this data to your Pathfinder’s PCM/TCM, which determines the input shaft speed. At this point, the PCM compares this data with the engine RPM, the output shaft speed sensor, and the 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” has no signal
With code P0717, there is no voltage coming from the turbine input/speed sensor. If the loss of voltage were intermittent, the code would be P0715.
P0717 Symptoms: Nissan Pathfinder
These are the most common symptoms associated with P0717 in the Nissan Pathfinder:
Depending on the transmission in question, symptoms can range from uncomfortable to impossible to drive.
Nissan Pathfinder P0717 Causes + Diagnosis
The good news is that with P0717 there are not many common causes, and the fix is usually quite simple. Here’s how to diagnose this code on your Pathfinder:
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 input/turbine speed sensor is working, it’s likely that the sensor itself is malfunctioning and causing P0717 on your Pathfinder.
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 if 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 still works 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. Just be suspicious if the sensor and wiring seem okay. Check that there are no Nissan technical service bulletins related to the PCM.
Although it is difficult to drive your Nissan Pathfinder with P0717, fixing it is relatively simple. Good luck!