So i have a 2015 MCS Auto with 80k miles. Recently i have been hearing a rumbling sound from around the passenger foot area. It’s especially loud when i put in reverse. Has anyone had that issue or knows what could be the problem ? Any help is much appreciated . It’s been bothering me like crazy.

 

Have you ever replaced your upper engine mount? If not, that may be something you want to look into.

 

Any videos you could provide? Passenger's area is where the upper engine mount is located and seeing as how your car has 80k on it I would not be surprised if that's the issue. A test you could do is to use manual sport mode (M/S on your shifter), keep in first gear and drive up to 4k-5k rpm and letting off the throttle to hear for the sound.

 

Does it sound like this? Sounds very similar to a heavy bedframe creaking.

 

I’ll try and get a video tomorrow.And no haven’t changed the upper mount.