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2010 Jeep Liberty remote starter isn't working

Took my Jeep in to the dealer and they replaced the battery. Now the remote start won’t work but they say it’s not there fault as the remote start is older (4 yrs old) and they can’t figure out why it won’t work. it’s a Python remote that the Jeep dealer installed.

Does the remote start transmitter use a battery? That battery could be weak/dead and just a coincidence it happened at the same time.