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,

ask the shop that did the repair. most parts are 12,000 miles or 12 months. some are longer.

original warranty was 5 yr 50k. replacement electrical carry a 1 yr warranty. i would be more concerned as to why it failed. these are very durable units that just dont fail without something causing it. thanks for using repairpal Roy