hi i am new to the forum but not the duramax i have had one for about two years now and am on another forum but no one seems to have an answer for my problem and was hoping i could find one here ... a couple weeks ago my truck flashed the service 4wd message and it wouldnt go into 4 hi or lo i was looking around and decided to change the actuator and switch and neither helped i had the code read today when the message showed up and it was c0306 i was wondering if anyone had any ideas as to what to look into next thanks in advance
