Actually, I take it in tonight to leave it so they can check it out. I took it in that day and the stupid code went off on the way there, but they were able to see it and said it had to do with the DEF system. I had to bring it back so they could put me in a car while they have it. We have had the light come on several other times, but it did not shut the truck off and went away after driving it. Anytime, we sit somewhere for a minute the light comes on and I am thinking it should not be that sensitive. so we will see.