Dear All,

I need your help identifying a noise. This has been going on for a few months now. When I got a nail in my tire, I had the tire shop take a look at the same time. They didn't see anything wrong.

2012 ML350 4Matic, 90K miles.

The noise:

• Seems to be coming from passenger side, but I can almost feel it (vibration, or something moving) under the driver's side floor board.
• Is audible at above 50 mph only
• Is a mix between a rustle and creak
• No issues in driving

Thanks in advance,

 

Longshot. Check the motor mounts. My GL's failed at 45k. No noise but I wasn't listening for one. Vibration was on startup and then at higher speeds.

 

Yes check all rubber components:

Engine mounts
transmission mount
propshaft flex couplings

also front propshaft and front halfshafts

does it make a noise when turning the steering wheel all the way to one side (in a parking lot at low speed)?

 

Pictures of both sides, anything look wrong?

I’ll have the mentioned rubber parts checked. No noise when turning.

 

Nothing seems wrong in the photos, but the photos don't show the components that might have failed.

Look at the engine mounts from above, in the engine bay. Have an assistant blip the throttle while in park, while you check to see if the engine jumps.

Transmission mount and flex couplings need to be checked from below the vehicle. Time to crawl under with a bright flashlight for a look.