3D_Illustrator,What proceeded those three numbers? A complete OBD2 trouble code should include a letter and 4 numbers. The letter designates the system that the code. For more information on this, check out the OBD2 index thread link in my signature below.
C0308 - Motor A/B Circuit Low
C0323 - Transfer Case Lock Circuit Low
Since you have posted codes that are listed as valid TCCM codes, I am assuming that you are doing it correctly with an enhanced scanner.
As far as the 4wd system is concerned, it can only be accessed by an enhanced scanner. A typical generic OBD2 scanner will not be able to access the TCCM. TCCM codes should be proceeded by C for chassis. Please try to limit yourself to one thread with your question