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The 2017 Chrysler Pacifica uses a CR2032 battery for its key fob. If your key fob isn't unlocking your doors, instead of buying a new one right away (they can be expensive!), try replacing the battery first. To do this, press the square metal part on the bottom left of the fob, opposite the Panic button, to release the key. Then use a thin object like a credit card or flat head screwdriver to remove the two black plastic pieces. You'll find the battery underneath, which you can take out using a screwdriver. Replace the old battery with a new one, making sure it faces the same way. Put the pieces back together, and you're good to go.
The size of the battery needed for the key fob of a 2017 Chrysler Pacifica is CR2032 with a voltage of 3 volts.