[Brummo]

Front Park sensor had ice on them all weekend and gave me the warning to wipe them off. Even after cleaned still gave the error. Went to fill the truck up tonight and it spontaneously cleared. Then went to wash the truck off, half way home it did it again.
It's going in for service Tuesday, but is this something that happens frequent with everything exposed behind the bumper?

 

[07Dually]

I’ve got a similar problem. My rear sensors recently stopped working and started giving a service park assist message.

 

[Lins]

I see it a lot in the winter. Any ice, frost, snow will trip them. They have to be SPOTLESS

 

[Brummo]

Now they are working again...so confusing..