HI there
This code is for the transmission speed sensor, not to be confused with the vehicle speed sensor. If the sensor is good then the wiring, computer or signal plate inside the transmission has failed. You should see reference voltage to the sensor through the wire and the other is the signal wire. A good scan tool would allow you to see what the computer is seeing.
P0715 VOLKSWAGEN - Input Turbine Speed Sensor Circuit Malfunction Read more: https://www.autocodes.com/p0715_volkswagen.html
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