When I engage the 4wd the light flashes and it sounds like it engages but it isn't engaged or it kicks right back out. I fix my own vehicles but have never encountered this problem before and can't seem to find any info on line about the problem. Also i dont know if this would make a differense but it has a lift kit on it... Some body some suspension not sure how much of each but I know its 11 inches total! I know everything worked about a year ago and nothing has changed since... One day it quit working and has been doing this ever since!
I have a 99 GMC Yukon denali.. 4wd kicks out on 1999 GMC Yukon Denali
poss. issue with fork shifter.