Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
There were 2 main causes for this model with this message/light here.First was an issue with the switch control itself.This would fail or act up internally needing replaced.Usually you could see the light indicators on the switch blank in and out if this is the switch issue either while driving or while trying to shift in and out of 4wd.
The other issue was the encoder/shift motor on the transfer case.Usually the 4wd switch can be operated but the light for 4wd may flash and never engage into 4wd when this is the cause here.
What needs to be done from here is to have the fault codes read out/checked with a compatible scan tool that can plug in and communicate with all computers in your model especially the 4wd computer.Once the codes are read out of the 4wd computer they can be diagnosed and repaired.Remember this does require a compatible scan tool that can read the 4wd computer to diagnose and repair this here.If you can get the codes read out and post them here this will help.
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