I have a chrysler 300 only hax it a month.
Chrysler 300 car key battery.
To test the new key fob battery stand near your 300 and press the unlock or lock buttons.
From the owners guide.
In case the ignition switch does not change with the push of a button the rke transmitter key fob may have a low or dead battery.
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Published on apr 20 2019 2 cheap battery https amzn to 2gxarjb here is a quick little video to show you how to replace the cr 2032 battery in the chrysler key fob for the 300 and 200 models.
If the new battery is working properly you should see the parking lights flash and hear the door locks opening or closing.
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For more check out all of my 2011 2017 chrysler 300 diy repair maintenance guides.
You can start the car with a dead key fob battery.
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