Thanks for the file, it's much appreciated.
I will be checking the wastegate to be sure it's not seized. Right now, the truck will drive fine for 10-20 minutes after being shut off for a bit, then go back into limp mode.
I had the CEL and wrench come on the other day with code P25B4 wastegate stuck closed, and the truck is also in limp mode. I see a lot of people have had the wastegate actuator replaced, which I plan to do myself to see if it fixes the problem before going down the turbo replacement route. The...