I seem to be having the same issue. Just purchased a 2013 Cmax about two weeks ago and I noticed that when I come to a complete stop, I get a continuous high pitched noise coming through the speakers. When I put the vehicle in park, it stops . When I return it to drive, it starts up again but then stops when I start moving
VID_20230126_141930[1].mp4
. I wiped off all the sensors on the front and back bumpers. That seems to have helped, but the issue has returned. I took a video of it happening, will attempt to attach this, not sure what the file size limitations are on this forum, I may need to compress it.
High_pitched noise.mp4