Problems with the 4x4 of Chevrolet Pick 2006

Help, I stop working on the 4x4 of my Silvrado Chevrolet 2006, the electronic board in the control panel does not work, started to start alone and suddenly no light was still caught, nor is it today that the seneloid works where the change enters the tarsmision, they have told me that it is the selector plaque and others say that it is a motor that is going down the tarsmition.