Help me please
 

Truck is a 2002 dodge cummins.6.9 truck has two codes.1693. Turbo charge control circuit malfunction .0234 engine over boost condition.where are control circuits . And how do I stop the over boost condition.please someone. Put truck in drive it barks weels and dies.lile it's stuck in high gear

Do you have a tuner? any mods? any recent work done to it? all could be useful.