2008 Ford F-350 6.4L Powerstroke Resuced Engine Power Problems?

So Started the other day the trucks coolant temp gauge spikes Oild temp gauge shows dead centerno check engine or wrench, message display center showed coolant gauge symbols and says reduced engine power. I pull over **** truck off, get going again does it again. No check engine no wrench no codes. I replaced thermostats Andy did not solve issue.

Any ideas

Check engine temp with a scanner. Could be a bad temp sensor. Pressure test the cooling system for leaks.

Fried engines do not heal by themselves. If the serpentine belt broke and the water pump isn't being driven, that's what will happen. Raise the hood and see if the belt is not there. Do not run this engine until it's fixed or it will be damaged beyond repair. Don't ask Andy to solve this since he failed so far.