Low Boost

[Mr Hagg]

Did you check turbo vgt ring when you had actuator off? Did it go full swing? If so then you should be looking for either a bad exhaust leak.(before turbo or piping going to egr) Or you may have a boost leak. Either one you should be able to hear it... If truck has been tuned then it may be in a silent derate and will need to be reflashed....

Being you was able to calibrate turbo does that mean you have insite? If so monitor vgt position see what computer is calling for and what the actual is.

Also could just be bad sensors. Engine off Key on check intake pressure and exhaust back pressure see what reading are. Depending on what part of the world you are in it could be any where but look at baro sensor reading exhaust should be close to that with engine off.

check it out and let us know what you find