Strange noise at rear of vehicle
Hoping someone else might have encountered this and know what it might be. When the car is sitting in our garage, doesn't matter if it was just driven or has been sitting overnight, and you open any one of the doors and then close it, after the car "shuts down" (i.e. turns off all lights, and kills any accessory power) there is sometimes a metallic noise (I hesitate to call it grinding) that comes from the rear area of the vehicle (outside, underneath it).
I thought maybe it had to do with a central locking system or something, but it doesn't occur every time we shut the doors. So far no discernible pattern to it. I've tried to capture an audio clip of it, but whenever I have my phone it is as quiet as a church mouse. Anyone have some insight on this? We asked the dealer service guy, and he has no idea, and of course it didn't make the noise in his presence.