Originally Posted by firewire
I have heard the same sound from my 2011 Laredo 4x4 Hemi and can't find much info at all at what the sound could be. It's intermittent so I can't even begin to tell Service what it is.
I suspect for the Hemi, it is the sound of the engine sucking money out of your wallet.
The OP didn't mention an engine type, which limits ability to answer.