How do I trouble shoot the problem listed below. What codes should I look for ?
on 1998 Chevrolet Suburban 1500

I have the 4 button control four shifting between the various modes. The red neutral light and the 2HI and 4 LO lights are on.

very poss the switch is going out,very common.get a diag as stated in previuos post
1 more answer
It needs to be scanned with a Tech2 scanner to read the transfer case module and find the fault.