Wont go into 4h or 4low when turning switch on.

What is your question?

09 Ford ranger 4x4 super Cab. When I turn the selector switch to 4 high or 4 low it doesn't do anything. It worked about a week ago. But now it doesn't.

What makes this problem better or worse?

Nothing

How long has your 2009 Ford Ranger had this problem?

Week or two