Electrical hum from rear of car only happens long after it has been shut down
 

So this is the second time (owned the car for 6 months) I've noticed an electrical hum coming from somewhere in the rear of the car after the car has been powered off for several hours.



The latest time I noticed it, I stuck my head under the car and it seems to be coming from the rear somewhere in the general vicinity of the rear differential but I wasn't feeling motivated enough to lift the car up find a flashlight and start poking around.



My car is a 2017 that is usually garage parked, so it's quiet enough that I can hear feint noises.



My car has been flawless & well maintained so I'm not concerned, just curious.



Anyone else notice this?

That's normal, its your EVAP system doing its test.

if you said it was more like a whistle i think i know what's going on!

https://www.youtube.com/watch?v=G4By...l=JonnyAmazing