I had a similar problem with a deal installed alarm. It took 5 trips back
to the dealer to fix the problem. I thought that the problem was a
high-resistance connection in their installation. They replaced the alarm
unit 3 times (or so they claim).
My problem seemed to be when I parked overnight and the truck sat in the sun
all day long, the alarm would go off when I tried to use the keyless entry.
I would have to disconnect both batteries ('06 2500 CTD) to reset the alarm.
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