Switch, Motor, Module? 2001 GMC Jimmy S-15

DIESEL JOE

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I know someone else has had this problem and I have been looking for an answer for weeks now.
What I have is one day I looked down and seen SERVICE 4WD, I had never seen this light before so I stopped and pushed 2HI and that's when shit went to shit. I took it over to a friend's shop for him to check it, said the motor was bad so I replaced it. Then I replaced the switch on the dash, which is a 4auto/2hi/4hi/4lo. Well, this didn't fix a thing, had to unplug the switch to get it out of 4wd. I've been driving it that way for a couple of months now. I've read where you pull the fuse and wait for an hour and that will fix it. Another one was read codes for it but just haven't figured that one out yet. I'm old school and just don't understand some things, that's why I'm asking for some help. I'm 67 so, please
 
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