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This was covered under the standard warranty.

I had a rattle within my driver's side door. I experienced this with certain types of reverberating base. I had my local dealer try and diagnose/fix it several times. After switching out speakers and trying a few other things it was ultimately fixed by putting some foam insulation within the inside door panel (at the top). Hope this helps.

I have the same model/yr with 46K miles on it and the exact same thing recently started occuring. An obnoxious squeeling noise (about 50% of the time) upon starting the car. I've yet to take the vehicle in to have this addressed. Any advice? Thanks in advance.