Sounds like you are having the same problem I had. I don't believe its your chargepipe. You might want to take off your jb4, clear the codes and have them look at it. I had similar problems and they ended up replaced my boost solenoid. It fixed the problem for about a week and my boost was gone again. I've just been to lazy to see what the problem is.
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ERnie
2016 BSM/f80/ZCP
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