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2008 GMC Sierra 1500 - Alarming problem

Horn goes off for no reason and lights flash and this truck starts automatically with out me pushing any buttons. It woke up the neighborhood! I know it will do it again so what should I do?

Check under the dash to see if an aftermarket remote start system was added to the vehicle.

And then RIP the thing OUT. Aftermarket remote starters are nothing but trouble.

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