CM871 code 2973

[Valley11]

I have a CM871 in a T800 Kenworth demanded 3 years ago by a fairly reputable guy out of Ontario. Over the last year code 2973Intake manifold 1 pressure - Data erratic, intermittent, or incorrect has been coming up once in awhile with a full load. Now it comes active 4-6 times on a 2 hour trip. When code is active boost pressure is lost and stays at 0PSI, when code is not active I can build 36-38PSI. It will go active in higher gears at 1600-1700rpm goes away after awhile and truck runs fine until it happens again. I monitored some values on the last trip but can not seem to find if they are in spec or not. Any help would be greatly appreciated.

I have found that the crankcase pressure sensor has been disable and no code shows when I disconnect it.
Intake manifold pressure went as high as 78.5 inHg usually ran between 40-65 inHg
Exhaust gas pressure went as high as 158 inHg usually 80-120 inHg
Barometric pressure was 28.5-29.3 inHg according to weather network local pressure was 30.7
Intake manifold air temp bounced all day started at 50F then dropped 9-12F and then ran around 22F It was -27C -38C with the wind
Turbo speed top was 103000rpm
OEM temp is set at 72F never moves with truck out in the cold or in the heated shop
If anyone could tell me if some of these tubers seem correct or not or any insight on what I could check next