will not shift back to 2 wheel drive from 4 wheel

Hello,

There could be a number of reasons why it is stuck in four-wheel drive mode.
This could be due to a faulty transfer case module, bad relay, wiring issue. It can also be the selector switch.

The best course of action would be to take a step-by-step diagnostics approach.

I have attached the trouble shooting steps for this issue below.
Go through those steps, as it can help you determine the issue.

Please let me know if you have any questions.
Thank you.