Circuit Description
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The Park/Neutral Position (PNP) Switch is externally mounted on the transmission manual shaft. As the gear range selector lever is moved, the state of the P/N switch may change, causing the Park/Neutral Signal circuit to open or close. An open circuit or switch indicates a drive range and a high voltage signal at the engine control module (ECM). A closed circuit or switch indicates PARK or NEUTRAL and a low voltage, 0 volts, signal at the ECM.
The ECM uses the PNP Switch status in order to enable starter operation.
If the PNP switch signal indicates low when the vehicle is in motion for a specified length of time, DTC P0852 sets. DTC P0852 is a type C DTC.