Electrical buzzing from engine bay?

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Jun 22, 2019 | 04:30 PM

#11

cthusker

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Joined: Nov 2013

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From: Northwest Connecticut

Interesting that not everyone seems to have that noise. I checked my 2017 3.5 several times and there is no noise after it's shut off? Now I'm wondering if that's a good or bad thing....

Jun 22, 2019 | 08:59 PM

#12

ShirBlackspots

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Joined: Apr 2019

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From: Wichita Falls, TX

Quote:

Originally Posted by chris24

I've heard this weird electrical buzzing/humming sound a few times but it seems to be becoming more frequent. The pitch and volume change, it's not the same constant sound. I hear it with the truck "on" but the engine not cranked. Its louder from under the truck than it is listening from above the engine bay. Any ideas? I'm about to run out of the factory warranty and would hate for this to be a serious problem!

Vimeo video

Ford has an electric oil pump in the transmission to pump fluid around when the engine is off (during Auto Start/Stop operation) so that you can take off immediately (so that it stays in drive). That's what you are hearing.

Jun 23, 2019 | 01:08 PM

#13

chris24

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Quote:

Originally Posted by ShirBlackspots

It's a 2016, so no auto start/stop

Jun 23, 2019 | 01:09 PM

#14

chris24

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Quote:

Originally Posted by Bubba Bean

I hear it also (are we just hearing truck voices?). Everything is working O.K., so it must be part of Ford's grand plan for an F150. It would be nice to know what it is though.

Can you record yours? Does it sound like mine? The thing that worries me is sometimes it's louder than others and it changes pitch like something is failing 🤔

Jun 24, 2019 | 08:14 PM

#15

chris24

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Is there a relay that i can check for the fuel pump? Maybe it's sticking or something when the pump is priming?

Jun 24, 2019 | 11:11 PM

#16

TheRangerOfDanger

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Joined: Feb 2014

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From: NC

This has been a mystery to me!! my 2018 5.0 does this sometimes, exactly like your video. i have also noticed it with the key out. I left the truck and locked it, came back 30 minutes later and walked by the truck and heard it... sounds like an electrical component gone bad. Best I can figure is something in the starter or power steering area.... dealer is looking at it now while they are replacing my engine for oil consumption.... truck has 7k miles, burned through 5 qts of oil...no exaggeration!