Greetings all, This is my first post on this forum and I want to greet myself by asking for help!

Im having an issue with my vehicle.. Everytime, I park and turn off my car, "P shift" appears on my dashboard with a beeping noise and if I get out of the car, and close my doors, the beeping noise becomes louder. Due to this, I needed a boost numerous times because it drains my battery.. and now to avoid the boost, I unplug the battery.

I went to my local mechanic and even they couldn't figure out the issue..

Any ideas?