This just started happening the other day, goes away as soon as the RPM drop after initial start.
Anyone know why or if I should be concerned? Had an oil change at the dealer two days ago.
Perfectly normal. High pressure fuel pump. Mine does the same thing. Just give the throttle a quick blip. Nothing much, just tap the throttle real quick and it goes away instantly.
Fuel pump solenoid, I hate it but it's normal.
I took mine to the dealer for the same sound. They showed me a video where they unplugged the pump's electrical connector during a cold start and the noise immediately went away.
(This throws a code, so don't try at home)