Sounds after shutoff

[theUSAchevy]

This might have been covered before but I heard it again yesterday when I got home. There is some type of sound coming from the rear end of the truck once turn it off and get out. To me it sounds like an air ride was leveling out or something, it doesn't happen every time but I hear it often and have no idea what it might be. I'm not a professional mechanic but I'm more than capable and cant seem to figure it out from research online. Any insight would be awesome, thanks in advance!

 

[clstark7]

Mine has done it since day one. I think it is just electronics throughout finally shutting down. Mine sometimes does it a few minutes after I have turned it off, and similar noises when I open the door a while after it has been off.

 

[scotman623]

It does a self brake check and other diagnostic test after shutting down the ignition.

 

[2032Ceta]

I noticed those noises also. When I first get in it after opening the door, I hear a noise in the rear near the axle. Also, dropped the wife off and was sitting in the truck waiting on her with everything off. After a minute or two there were a bunch of noises coming from behind the instrument cluster. These noise happen every time so I'm pretty sure it something to do with these new electronics. Not going to worry about it...

 

[AK_Trail Boss]

This might have been covered before but I heard it again yesterday when I got home. There is some type of sound coming from the rear end of the truck once turn it off and get out. To me it sounds like an air ride was leveling out or something, it doesn't happen every time but I hear it often and have no idea what it might be. I'm not a professional mechanic but I'm more than capable and cant seem to figure it out from research online. Any insight would be awesome, thanks in advance!

Since it has offroad and sport mode, I was assuming that it was those systems. Someone below said it was a self systems check.

 

[Boop]

If its coming from the rear its probably the emergency brake engaging. It's just a little electric motor attached to the rear calipers

 

[Shaun808]

Sometimes it automatically engages the parking break, it does make a slight winding sound.

 

[GETGONE]

I also think it is the fuel pump releasing pressure since the Direct Injection systems run at super high pressure.

 

[1UP5DWN]

Mine makes noises before and after. Relays and pumps doing their thing. It was kind of weird at first, but since owning this truck i expect it now.