On a 2019 F150 w/3.5 Screw Lariat. 41K miles. From my Torque App I found the U code U3f05.
Looked on Google cannot find any listing for this code.
any help from "Y'all" ?

 

Bogus DTC. I can't find anything on it from my usual sources.

 

I had no light Just did a random check. I could not find anything with google.
The only thing I found was from a super duty power-stroke diesel forum something about an instrament cluster error.

 

U's are network communication error codes. Those are present all the time, and come and go. Nothing happens when the PCM doesn't get a response from one of the 30 queries it sent to the the ambient air temperature sensor this minute, but it sets a code. The only time those codes are useful is when you've got two buckets full of them, and nothing happens when you turn the ignition key. A really good engineer can use them to pinpoint a problem with wiring. Other than this, ignore them.

 

Good to know, thank you Gents.

 

I've seen bogus codes as well as codes that were missed by Torque Pro.

I've found that Forscan Lite on my Android is far more reliable.