My 2003 Tahoe alarm has went off the past 2 nights for not reason one time 2 30 am and next night 3 30 am. This is the first time this has happened I have owned it since new.

Does anyone know what could be causing it? Or how can I disable it. Its a factory alarm

The good old horn and lights going.

 

1.Battery voltage could be dropping out and the alarm senses it as a trigger...
How old is the battery? are all the connections tight? good grounding?

2. One of the sensors has become sensitive to a temperature change as it cools off at night..

3. Someone/thing really did move or attempt to enter the vehicle

4. Gremlins.....

 

1. The battery is not that old maybe 1 year.
2. Could be its is getting a little cooler at night now. I am in South Carolina.
3. Not likely even though I live in the woods I am up pretty quick when its done it with gun in hand... Havent seen any thing.
4. Maybe bigfoot

 

check your battery connections and the ground wire to the batter and chassis, I would bet that voltage anomaly is most likely the culprit.

check the battery voltage with the vehicle off it should be at s bit over 12v 12 point something, try charging the battery with a charger and see if the alarm goes off that evening....