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How to Fix a Key Fob That isn't Working If your key fob isn't functioning There are a few simple steps that can be taken to fix it. The first step is to be sure that it's not your backup remote. If your backup remote cannot unlock and lock the doors of your car, then it is most likely that the primary remote isn't working. The most common causes for key problems with your car remote are circuitry or battery issues. Battery The battery inside the key fob may wear out over time. It is simple to r