Circuit/System Description
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
The electronic park lock system purpose is to prevent the ignition from being switched to the OFF position when the transmission shift lever is in any position other than Park and the vehicle may still be moving. The electronic park lock system incorporates the park position switch that located in the shift lock control switch. When the transmission shift lever is in Park, the park position switch closes and the BCM allows the ignition to be turned OFF.
If the vehicle is not in Park, the ignition will turn to ACC/ACCESSORY and display the message SHIFT TO PARK in the Driver Information Center. When the vehicle is shifted into Park, the ignition system will switch to OFF.