The DTC P0726 OBDII means that the PCM(Powertrain Control Module) has detected a malfunctioning circuit range regarding the Input Speed Sensor (ISS) input signal. This sensor is located throughout the transmission case near the front of the input shaft. Besides, this sensor is sealed to the gearbox by a rubber gasket on the sensor housing.
This code is stored if the PCM does not receive the expected engine speed input signal voltage in determined time and circumstance. Unacceptable input signals may include insufficient or excessive voltage compared to transmission output speed, engine RPM, or throttle position.