Neutral light on 4WD selector switch stays on and won't shift to 2hi 4hi Auto 4 low

What is your question?

4WD selector neutral light stays on and can't select other modes My truck has the 4 buttons on the dash 4auto 2hi 4hi and 4low. I replaced the dash switch but nothing else. I hate to start replacing encoder motor, TCCM etc would only be swapping parts. I read several different problems but none saying what fixed it

What makes this problem better or worse?

never changes

How long has your 1999 GMC Sierra 2500 had this problem?

just started