Transmission Position Sensor/Switch: Description and Operation

The Transmission Control Module (TCM) pulls the Park/Neutral Position Signal circuit up to 12 volts in gear positions R, D, 3, 2, 1. The circuit voltage is pulled low in P/N. The ECM monitors the circuit voltage in order to compensate for in-gear engine load. If the TCM detects a problem on this circuit, DTC P1705 - Park/Neutral Position Signal Circuit will set.