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Q: I have replaced everything except my transfer case and my 4x4 will not shift. on 1999 GMC Sierra 1500

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My 4x4 is stuck in 4lo, replaced everything , what should I do next?
What does a professional scanner say about this problem? Any codes for the transfer case?? It could actually be a mechanical malfunction inside of the case!
First, turn on key, put your foot on the brake, then put the trans in neutral (auto) or push clutch pedal to floor (standard trans). Then push & hold 2hi switch until light stays on. If that doesn't do it, take it in to a pro to scan for codes.
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