Quote Originally Posted by Pmj-07 View Post
I had the same 0234-issue on my 2010 Opel Insignia 2.0 Turbo with the A20NHT engine ( also called LDK) , similar as in 2011 Buick Regal cxl. I solved it by increasing the Allowed Overboost Error somewhat.

See also thread:

https://www.hptuners.com/forum/showt...-A20NHT-26-psi
I did this for underboost as well to eliminate an occasional code that direction. Just increased it about 1.5 psi for the delta before it triggers.