Odd noise in engine bay

Video w/ sound


Not sure why this won't work?

https://youtu.be/oknWk3o55RE

Sure sounds like something "venting" to me... There are several one-way restrictor valves that are in the fuel vapor return lines to the intake manifold. They will make the exact same high-pitched buzzing noise when the fuel tank vapor pressure is forcefully venting through them.

Nope 2wd, normal mode.

Mine is more intermittent but it’s the same sound. It started about a month ago a little shy of 10k miles now. I’ve noticed that mine does this when the truck is parked in a downhill angle.

I bet related to the fuel pump.

TTT. Showed my service manager the video and they hadn't had anyone with it. Anyone figure it out?

I am getting this noise on my truck now. 2019 with 6000 miles. In 2 wheel. Only happens when truck is off. So weird.

menerso said:

I am getting this noise on my truck now. 2019 with 6000 miles. In 2 wheel. Only happens when truck is off. So weird.

Click to expand...

When you hear it next time unplug the negative terminal on the battery to see if it is electrical in nature.

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Also have this on my 2019.

Was out installing a wind gauge up on a tree, and I hear this weird kind of whistling/whining sound from down by the truck. Climb down the ladder and get up next to the engine bay and sure enough, something's going on in there. Truck had been off probably 2-3 hours.

It would intermittently do it, every few minutes and then shut off after maybe 15-30 seconds. Then just stopped doing it altogether for the rest of the evening.

I assume it's still doing it off and on as it sits out there periodically, I really wasn't too concerned about it but now I'm definitely not hearing that others have it, too. haha