Park/Neutral Position (PNP) Switch
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
For PNP switch removal and installation procedure, see PARK/NEUTRAL POSITION SWITCH under REMOVAL & INSTALLATION in appropriate SERVICING - A/T article in AUTOMATIC TRANSMISSION in TRANSAXLE/TRANSMISSION.