Service 4wd
 

2002 GMC Sierra z71
Hey guys n gals! So I got off at 5 this morning after plowing snow for the last 15 hrs, and when I started my truck service 4wd popped up. Yay I don't feel left out anymore! Good thing I had my genisys in the truck n scanned her right away, got code C0309 motor A/B circuit high. Anybody have the same problem? Or know what the most common problem is? TCCM? TC motor?(hope not!) Any help is greatly appreciate.