MHD Stage 2 Overboost?

pysical

Sergeant
Jun 16, 2017
345
73
0
Ride
2009 335xi E90
I have a friend who has a 2010 N55. He just recently took off the Jb4 and went with MHD. He put on Stage 2 because he has the DP for it and stuff. Anyways, he recently got 2 codes:

2C56 - Charging pressure control, plausibility Pressure too high.
2C58 - Charging pressure control: Switch-off as consequence

Here is 3rd gear manual mode
https://datazap.me/u/pysical/dan-manual?log=0&data=3-11

I can't find anything about if the MHD Stage 2 needs the 3.5 bar map sensor, or what is going on. But as I was the one driving it did not feel like he built 20 psi in 900 rpm.

Anything to check that may be the issue?
 
Last edited:

Rob09msport

Major
Oct 28, 2017
1,928
660
0
Monroe CT
Ride
09 335i msport le mans 18 x5
It does not need the sensor. I would make sure that he didn't click any flash time option for different sensor or anything i know n54 stage 2 Is 18 psi but that could also be a faulty sensor. Depending on elevation 20 psi is pretty much tilting sensor i believe 22.5 is logic limit and accuracy it's seriously inaccurate at 20 and above.