I have two codes I have questions about. The first one is 0234, the explaination for this one that I have is... . turbo boost limit exceeded problem detected in turbocharger wastegate. The other code is 1693, the explaination I have for this one is DTC Detected in companion module A fault has been generated in companion engine control module. Also... . DTC in PCM/ECM or DTC detected in ECM A 9companion DTC9 was set in both the ECM and PCM. What does all this mean? I'm a newbie so have patience. I also noticed that when I start my truck in the morning the rpms jump about 100 until it warms up, then its just fine.