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Just bought a new 2020 traverse had for about 3 weeks now went to work this morning worked for 8 hours came to my car it’s parked in a parking secured garage all the emergency lights were flashing didn’t turn off via fob had to turn off from inside my car and the horn also doesn’t work called onstar said no issues.

Went home and about 3 hours later happened again same thing horn still doesn’t work ( don’t think it ever started working again. Tried to start my car remotely cause it was raining didn’t listen so had to jump in the car to turn off manually again any thoughts ? No messages on the dash. Still pretty new to this vehicle
 

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It almost sounds like the security alarm activated, although it's supposed to go off after a short time. See page 29 in your Owners Manual.
 
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