heard grinding noise in rear of jeep, 4x4 light come on with a question mark

What is your question?

grinding noise in rear 4x4 light come on( tho 4x4 was not being used ) light had a question mark over it , what does this mean

What makes this problem better or worse?

hills and bends

How long has your 2007 Jeep Patriot had this problem?

2 days