i have this yukon ´04 with the code co327 (encoder circuit). i have no info for this problem. the 4wd light sometimes is on and so, system is innoperative; sometimes works fine. don´t know if theres is a bulletin for this. thanks.

FIX posted 1/12/2006

iATN Members:
Login to view full TechHelp request
Auto Repair Pros:
Join iATN to read this TechHelp request
Vehicle Owners:
Find a nearby iATN member to repair your vehicle