Puttering After Turning Car Off

Hello. I have a 2015 Santa Fe Sport. I am the second owner. The car just started making a puttering noise when I turn the car off. Rides fine no strange noises when starting just turning off. It never did this before. Any ideas what it could be?

I made a recording a little hard to hear but if you turn up the volume. You will hear my keys coming out turning off the car... then the sound follows.

mp3:
https://filebin.net/u36jhlca3r3zepv2