Hi guys, I have a 2005 z71 and until now (172,000 miles) it's been a great truck besides a transmission rebuild at 100k and now the service 4wd message is on and won't go off, and none of my buttons on the left side are lit up. It started just doing it every now and then And now it's constantly on. I tried all the tricks I used on my two previous z71's (an 03' and a 99') but its not working, tried starting and restarting, disconnecting battery, all of the above, do y'all think it could be a bad connection or an actuator, if so how do I find out? My scanner is only picking up 02 sensor codes which is the least of my worries lol any input would be greatly appreciated bc without 4wd in my line of work I'm screwed