You are in the same boat as me. Mine comes on after I park. If I sit in the truck for a while all of a sudden it appears. It doesn't come on while driving, but after I make a turn and stop it appears. I have yet to figure this one out and think it is time for the dealer to take a stab at it.
What is driving me crazy is the Nav System shows 3 of the 4 tires while the 4th is **. I figure that the sensor is screwed up in one of the tires but every time I check them they are all within a pound or two of 38.
Possibly just a bad sensor. The computer isn't reading it so it gives **. May need to be replaced. It may be sending a partial signal, so the light stays off for a bit. But then when it dumps entirely.... :idea: