SOURCE: 99 gmc suburban driver side door will not open from inside
My son and I both have 99 suburbans. We both had exactly the same issue. We found the the latch or handle inside the cab on the drivers side had broken off inside the door. Not a big deal. Go to a site called " Parts Train". You can buy virtually any part for your truck there. Get a new inside door handle, pull the panel and replace it. Not an easy job to getting door panel off or back on, but I guarantee this is the problem. You won't have a problem with the passenger side because it is used less. At Parts Train make sure you order the same color as your old one. Take your time and do a good job and you will have your fix.
SOURCE: 1996 gmc suburban driver side door, inside door handle not workin
take your door panel off and see if the rod is off that goes to the door latch
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