I have a rear left one no longer communicating in a 2012 Overland. I am not concerned and will look at replacing the batteries the next time I have a tyre change.
As far as I am aware you actually replace the whole valve unit, not the battery itself. They valve units are cheap enough though. I paid $50 for a set of 4 on ebay.
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2013 (2014 MY) Grand Cherokee Diesel 8 speed
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