I have the exact same problem and they have given me the exact same lines of BS. I feel like your wife. This car makes me nervouse to drive. In a parking lot someone jumped when I was backing out of a parking space and I thought somehow I must have hit her. When I rolled down my window she said no I thought you hit the car next to you. How embarrassing. I told her no my car has major design flaws. I will never buy another Mercedes. The dealership wants $5500 to switch it out for a different vehicle.Mercedes GLC Clonking and juddering on near full steering lock
I have had this problem since new but now the weather is cold and damp or wet the problem is much worse. I have viewed other owners concerns about this phenomena and would like to document my experience.
The car has been with the Mercedes dealership and they have coated the drive shafts with a lubricant to hopefully reduce or remove the problem.
The service manager told me that the clonking noise is from the tyres and another manager told me the car is trying to drive straight ahead (whilst in a turn) and it is the scrubbing of the tyre on the road which is causing the noise and the judder.
The service manager told me the car is safe to drive. However, I'm not so sure.
If I need to turn sharply to avoid a collision I do want the car to turn and avoid the object rather than juddering towards the object.
My wife has said that she would not drive the car until the clonking and juddering was eliminated as it does feel and sound bad when it occurs.
Over the next few days I will check if the lubrication coating has any effect on solving the problem.
I would like to hear the latest situation with regard to all those owners who have the same problem. I.e. is there really a fix or is it a inherent design fault.