Volvo d13 2013 truck will not go over 45mph? Egr stuck open?

My truck won’t go over 45mph while pulling a load or when bobtailing been having problems for 3 weeks still can’t figure out the problem I changed map sensor then one shop put a egr differential pressure sensor update kit (what ever the hell that is) and didn’t fix the problem the truck Regens good this and that but was put on a computer while loaded and it shows 0 fuel pressure when it hit 45 mph took to volvo and was told my egr is stuck open and egr cooler needed to be changed but I’m not sure if this will fix the problem has anybody else have this problem before please help

 

It has 601,000 miles on it I also change fuel filters also still no change

 

My codes was for the turbo and I replaced that and still same problem and the truck don’t ask for a park regen

 

It was 1127 fmi 8

 

No hard start it nothing truck is normal until I put a load behind it then soon as I hit 45 it start to hesitate it cut off on me one time when the mph dropped all the way to 5 mph but I changed the fuel differential sensor and it stopped now it just won’t go over 45 Volvo says my egr is stuck open plus my egr cooler was bad it failed the pressure test

 

No parked regen one shop did a force regen on it but still didn’t work truck still had the same problem