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2019 RAM 1500 horn and flashers went off when parked

Several times during the past week and three times in one day the horn began blaring, the flashers would start and not stop unless the engine was started up, and the engine light came on and stayed on. several attempts to stop wither the horn or flashers using the key fob would sometimes stop the problem. Parking the truck for a few minutes would initiate the flasher problem again.
I have only 1830 miles on it.

When you took it to the dealership for free diagnosis and repair of your fully-warrantied truck, what did they find? Via cyberspace, I would guess that this is a problem with the truck’s alarm/security system, but I will defer to whatever the dealership found when you took it to them.

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