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Alarm went off, tonight. Couldn't stop it.

Ninety-9 SE-L

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Horn and blinkers went off around 11:30 pm. No apparent reason, I also just checked my security cameras, not a thing near the truck when it started. I was in bed and the keys put away.

I grabbed the fob and through the window I pushed every button on the remote, attempting to stop the inferno. I watched as my fob unlocked and relocked the doors, the headlights would come on and go off as the doors unlocked and relocked. The amarm is still going off.

I run outside in a shirt and underwear, open the front door with the proximity key, alarm still going off. I climb in, successfully start the engine, turn off the engine. A few people started showing up outside to see what was going on. The alarm is still going off.

Finally I popped the hood, grabbed a flashlight and began to disconnect the battery. The alarm stopped on its own, just before I could get to the battery. For safe measure, I decided to re-lock the doors, then I disconnected my battery and left my hood slightly popped so I can reconnect in the morning.

... And to top it off, I'm inside writing this post, the fob is away in an RF-blocking pouch, nothing is near the truck (again verified by the cameras), but most importantly, the battery on the truck is completely disconnected. I hear a bang against the wall, as the electronic tail gate has now popped itself open.
 

djevox

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How old is the battery?
 

djevox

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The truck was built in May, so the battery is a few months old.
Thought you had a 2019 for some reason. I’ve never looked into what parameters would cause the alarm to activate, but at a high level view, it would be “sensors” (i.e. door, tailgate, hood latch registering open), wiring, or a module interpreting something incorrectly/ bad module. It sounds like a dealer problem considering how new it is. Probably not worth buying a subscription to a service manual and a scantool/app with enhanced diagnostics, at least while the truck’s under warranty.
 

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