Ok so I have 2015 f 150 fly , if your tires are low the dash light goes on and the chime, when go to the tire screen the low pressure tire will just have a line threw it ? Is that correct ? Too bad it couldn't tell you how low.

 

no, that means it's not working/reading. If it's working it will say the actual psi.

 

Wow ! Thanks for telling me

 

I have one that also does this. Moved tire to different location and problem followed.. Only does it after driving for over a hour on the highway so far.