Lamp out message on dash

[dentom052]

Maybe this has been posted before????

I have a 2005 Ram Cummins. I have a "Lamp out" message in my dash. This occurs during the daylight when no lights are activated!
I have done the "Drug Carry", LOL, walk around my vehicle before I drive it and all headlights and exterior lights including license plate light are functioning. Also tried the bright lights.

Seems like I read, a connection between the headlights can cause this, even though the headlights are normal brightness.
I do not have a diagnostic reader but can get one to read the body computer?
I'm a master mechanic that understands computers and electrical

 

[Curmudgeon]

Is the 3rd brake light good?

 

[1999 White C5 Coupe]

Is the 3rd brake light good?

Very common - one of the two center, high mounted brake light bulbs are probably out.