Have a look through this sticky , it may give you some idea's , the vacuum system can be hard to chase down some leaks.
good luck , i had problems with the PVH solenoid some years ago, i ended up fitting a new one only to find it wasn't the problem, so go through the info and see what you find and report back.
Just a coincidence, the ESOF has no connection with the turbo or pedestal, so after you have gone through the sticky you will have a better idea of what your looking at.
Once again appreciate this thorough thread on how to diagnose.
When this code P1876 is reported, should my Transfer Case still switch between 2H-4H-4L ?
Because mine shifts to each of these and back out of them to 4H.
Will a leaking ESOF throw this code? I think thats how I made it go away last time.
I don't remember the details but the tcase can be locked and unlocked through the relays under the hood using jumpers
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