I don't know, but recently I took my door panel off to fix mine (found out I had a busted wire between the door and body and didn't have to take door panel off, lol). You can do the same to look inside and see, maybe a nut came loose on the window guides or something. It isn't that hard to do, just make sure you get the hidden screw behind the door handle, it's behind a panel that pops off on the door handle.