Suspension.
But could be a lot of things. Your coffee cup rolling in the trunk. Doesn’t sound like it’s really attached, whatever it is, so it’s concerning. I’d pull the wheels check things if it was my car.
this post was submitted on 07 Apr 2025
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Ha, yeah that reminds me. Once I had a rattling for a week or so. My boss was riding with me and I mentioned it. He said, you got anything unsecured back there? I immediately remembered the jack I had haphazardly secured about a week or so ago. I felt like an idiot, but at least problem solved.
Have someone push up and down on the front and back of the vehicle while you lay underneath to locate the sound.