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As an American, you've just discovered that the remote on your 2015 Hyundai Sonata isn't working, and it seems like the battery needs replacing. The Sonata uses a CR2032 battery. Replacing the battery on your remote is a straightforward process. If you've done it before, it's easy and you won't need my help. However, if you're new to this, grab a small flathead screwdriver or a credit card. Gently use the screwdriver or card to open the remote. Once it's open, take out the old battery and insert the new one. Close the remote, and you'll be good to go.
You can easily change the battery in your 2015 Hyundai Sonata key fob with a CR2032 battery for less than $6. This DIY fix is both easy and affordable.