Yesterday I was driving my truck around during the snow storm in 4wd. At one point the wrench light came on and it felt like I lost 4wd (can't be sure though). From what I read, when people see the wrench their truck/vehichle is in limp mode. I didn't feel like I lost any power and was able to drive around. It remained on for the entire ride (I was driving around picking up my staff for work). Later on in the afternoon when I started the truck, the wrench light was gone. I'm going to take it in to the dealer today to have them look at it. Will it show a code if that wrench light is off? I'm used to check engine lights and reading DTCs but is the wrench light different than a CEL?