Auto start quit working, 2008 grand Cherokee, kept loosing distance, would only work sitting in jeep, now quit altogether ! All other functions work ok ! Replaced remote battery, no help !

Factory installed remote ENGINE start option.??
my 2005 to 2010 service manual shows no such device.
Flashlogic, after market bs? that?
or this (later it was an upgrade) per below.
http://www.wkjeeps.com/wk_remote_start.htm
so, does car start, key in ignition? that be like first.!!
does it?
if yes, then next is to look at the cluster for evics display errors.
better is to scan to pcm and see why,
if the magic is broken, scan it, or get it scanned.
on factory cars the remote start is very strict,
and it will tell you why it fails.
is that Another key , real, came with and worked before.
the keys must be married to the PCM./BCM for them to work.
scan it

find the guy who installed it and get them to make it work.
we cant guess what is installed in your car
find a live human that can look and see that, see first if
it is factory kit or aftermarket
they do not work the same, so.......