I have had 2 issues over the years re: the 4WD on my 2003 Tahoe.
1) The "service 4WD " notice has come on probably 20 times over the years since I owned it, staring in 2004 after I bought it. I pull the fuse, wait a few seconds, and then put it back in and all is well. This is a programming...
I have the same condition on my 2003 Tahoe where the motor clicked but wouldn't move. Took it apart and sure enough the plastic overmolded gear on the brass hub had split and was binding up the worm gear. I believe GM made a horrible material combination selection by mixing brass and nylon given...
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