I've been deleted since 5000 miles. I've got 23500 miles now without any issues until today. I was cruising home when all of a sudden I heard a ding and saw the check engine light on. I plugged in the XRT and it showed code U2579. I cleared the code and restarted the truck and it seemed ok. I didn't drive it anymore today. I haven't had any problems with this truck before or after deletes. I checked my list of codes for these trucks and I seen a P2579 code which says "turbocharger speed sensor circuit performance. Does anyone know what this means? Should I be worried? Truck seemed to be running fine. I will find out tomorrow when I drive it again. Also why did the XRT show a "U" instead of a "P" for the code? Thanks for any help.