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How to Fix a Key Fob That isn't Working If your key fob won't work and you're not sure why, you can fix it by following a few simple steps. The first step is to be sure it's not the backup remote. If your backup remote cannot lock and unlock the doors of your car, then it is likely that the main remote is not working. The most common causes of key malfunctions for car remotes are battery or circuitry issues. Battery The battery inside the key fob may be worn out over time. It is simple to