Why is the 2011 ford ranger 4wd not working?

While there are a number of reasons that Your four wheel drive in the 2011 Ford Ranger will fail to work, some of the most common include a failed 4WD module, issues with the transfer case, a defective 4WD engagement motor, or a blown 4X4 motor fuse. In the case of a blown fuse, it's typically accompanied by a bad engagement motor as well. The first thing You should do is check for any diagnostic trouble codes (DTCs) with an OBD-II scan tool. If You're getting any, they can sometimes point You in the right direction. If You're not, You will likely need to test the 4WD module and replace any components that You find defective along the way.