How long does a power module last or gaurantied

Your really have to be more specific as to which module was replaced. There are 11+ modules in a 2003 Liberty, many are called POWER MODULES by tha layman. In essence, they are all power modules, but they power specific components of the vehicle, example Powertrain Control Moduel (PCM) [engine fuel, ignition, charging system], Transmiccion Control Module (TCM) [transmission electronic functions], Body Control Module (BCM) Vehicle interior / exterior lighting,, Controller Anti Lock Brake (CAB), just to give you an idea,