I am going to try to take a look at it tomorrow after work and see if anything jumps out at me... I have had the truck go into limp mode once before but I was blaming that on a belt that was in ruf shape thought it wasnt turning the water pump as fast as it should.. since then the belt has been changed but problem still exsists... You may want to check your power sterring pump pulley just for grins cause I had mine chuck off the pump a few weeks ago due to the pulley being plastic and craking around the hub... some were plastic and some were metal i guess.... I will report back if I find somthing....