HELP! With this rattle...

[cdavis]

4500 miles on my 2021 Platinum and this rattle is just getting worse. It doesn't really happen on level bumps (like a speed bump) where both rear tires go up and down at the same time but seems more like when it is an unlevel area where one tire is up and one is down (obviously alternating quickly). I feel like I'm about to lose my mind with it....especially given the newness of the truck. I think I have it narrowed down to the back seat area on the driver side. I am attaching a video in hopes someone will recognize it and lead me in the right direction. My son rode in the back and he thought it was coming from the driver side back door. Also, I can drive on a smooth surface at a slow speed and swerve back and forth rapidly and hear it.....seems obvious something is loose....just can't figure out what. Just FYI I have removed everything in the storage area under the seats....I've locked in the seat belts and I've tightened the tire jack as those were all my first guesses as to what it might be. I still got the rattle even addressing all those areas.

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[tonesto7]

I thought I read somewhere that the wire harness for the sliding glass rear window rattles. Normally it’s with the bass playing loudly.
Good luck! Unknown Rattles are enough to drive you mad!

 

[Pete6114]

I'd be under it and check the running boards and also check all the harnesses/lines underneath. I found several loose, with clips attached to them but just not pushed in. Biggest issue was the orange, and another black harnesses underneath right at the L.R. corner feeding the plug in the bed.

 

[kartindick]

I know this old, but I found a missing (it was there, just bouncing in the general area where it went) bolt for the jack mount on my 22...might be worth a check for others.

 

[True North]

Well at least you know where your part goes. I`m up to 3 found items on my truck straight from the factory. A double waisted chrome bolt from under the dash, a black fastener similar to yours found under the passenger seat and some kind of black poly item found in the back. I wonder if we all get together if we can pull a Johnny Cash and build a ford truck from spare parts. Couldn't do much worse than the present companies efforts. GLTA

 

[RossRR]

It's not a broken bolt rattling around in the rear wheel is it (max tow axle problem)?

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