2019 Limited
Every time I shut the engine off, I hear a low hum from the dash, engine area for about one minute, like something is still running. Tried opening the door to see if it stops, it it doesn’t. I’m coming from a 2012 Lariat 3.5 Ecoboost that never had this sound, nor from any other vehicle I’ve owned.

Anyone know what it is? So far, I have not seen this in the owners manual.

 

Mine has it also. lasts about a minute. I'm going to take a wild guess it's the DC to DC inverter. Because of the current draw and voltage dip during the auto start function Ford had to put in the inverter to maintain a constant voltage to some voltage sensitive electronics. It's under the dash passenger side

 

Probably your fan cooling the radiator after shut off.

 

i agree with KWS, engine cooling fan spinning to a stop.

 

Nope this is inside the truck. Totally different sound from the electric fans under the hood

 

I’ll check the engine area to see if the hum is from the cooling fans, but the inverter idea does make sense.

 

Could it be the center dash speaker making noise?

 

My '19 has a humming sound for 1-2 minutes after every shut off, it always has, and the length of time it lasts varies by 10-20 seconds each time.
It is a low volume, deep tone.
Definately Not engine fan.
I never thought it was anything wrong, but that is is simply module(s) shutting down
Which ones I have no idea.
It's hard to say if it's coming from the dash, and/or behind the rear seat.
Does this seem like the same thing you're experiencing?

 

Yep sounds like it. I agree nothing to worry about but old gear head here so always curious.

 

If you open the door, after shutting it down, does it stop. You know, like the radio or window does.