Mine did it again this morning, nothing on the sensor itself. I'm thinking water gets into the wiring behind the bumper when I wash it.

 

Dielectric grease?

 

Not a bad idea, I've got some at home, I'll give it a try when I get off work tonight.

 

Dielectric grease is not a solution and as a licensed electrician I will not accept that from Ford. My truck is at the dealership, they're paying for a rental, fix it.

 

dielectric grease is a proper way to waterproof a connector fwiw. The viscosity of the grease keeps it inside the connector and therefore keeps water and debris out. That is assuming a non waterproof connector of course. Now ford should use waterproof connectors if you ask me, but if they didn't what are you going to do? On a side note if you do use it, try not to directly apply it to the contacts of the connector. Place it around the inside and outside lip as well as the wires on each connector.

 

There is a product called Corrosion Block which is dielectric. It's a spray that bonds to the metal and keeps moisture off. Dielectric silicone grease works but I've found that the Corrosion Block spray is superior. I haven't had this problem with my sensors so I suspect you might have one with a bad cannon plug seal. Not uncommon with all manufactures. On all my ATV's, boats and equipment that gets regularly abused I fill all the cannon plugs and switches with this product and it prevents failure. I've used another product called Corrosion X also. That one had a tendency to swell rubber seals but worked fantastic as well.

 

Hey all, apologies for bringing up an old thread, did anyone ever get to the bottom of this? Having the same issue in my 2017 F150 SCrew. Wonder if there was a bad set of sensors or something from the factory.

 

 

 

2015 Lariat Crew

Mine did this once several weeks ago with first hard freeze following wet weather (left side). I wiped off the sensors and it did it a few more times. It has been ok since except that it rarely detects a moving pedestrian while shifter is in reverse position. It will usually detect a moving vehicle, but not always. It used to work much better.