C1142 Nissan ECM or brake sensor issue

Question

I've a Nissan X Trail (T30) 4WD and have problem with brakes. THE OBD2 analysis shows the error code P0234, C1109 and C1142.
C1142 may not be linked to pressure switch integrated in the control unit but linked to the pressure sensors uner the brake cylinder.
I read on the net that it also can generate the code P0234 linked to overboost.

Thanks to provide me information since the mecanis wants to exchange the control unit and some other stuff for total amount of 3500 euros.

Bob Dontail