If i push my 4 wheel drive button it won't change. It stays in 2 high. Why?

Cannot be nothing other than a guess in this forum. Recommend you get it to a good honest technician on that one. Here are some the things that are possibly causing problem. Not a extremly tought diagnosis for many techs. Axle Actuator Ground Front Axle Actuator Power Front Axle Actuator Wiring Front Differential Transfer Case Control Module (TCCM) Transfer Case Control Module (TCCM) Connector