I had a rattle that sounded like it was coming from the upper left dash or in the dash while going over the expansion joints on a bridge it turned out to be the slide out part of the sun visor, I pulled it out slightly and the sound went away. Not the answer for some, but something to check.

2 weeks ago traded truck in.... $1500 put towards car, got a $500 military credit My out the door price with this $2000 added in was $22,477.00 New 2010 pearl black sls window sticker $26,814.00