Factory Alarm is going off for no reason

[Ryan6769]

The factory alarm on my 2018 Yukon Denali has been going off at random the past 3 nights. Every time it’s happened at night. 9pm one time. Then between 11-11:30 the other two nights. Tonight it went off 3 times in about a 10 minute window. First time it’s happened more than once.

My model has the interior motion sensors and I just went out and turned them off.

Has anyone else had this problem? Only 5k miles on this thing — shouldn’t be happening! It’s glitching. Doesn’t happen during the day at all.

And no, no one is breaking into it.

The horn is honking and the high-pitch siren is sounding as well.

Any insight, guys? My neighbors have got to be getting mad at this point.

 

[swathdiver]

No cat or raccoon footprints on the truck either? Could security lights on the house going on and off be setting it off?

 

[dbbd1]

Raining heavily?

 

[Mad Maxx]

My new '18 Denali has done it twice now as well for no reason.

 

[Ryan6769]

Interesting. I wonder why?

To update, I’ve been deactivating the interior motion sensors since and it hasn’t happened again. However, I didn’t do that tonight and so far nothing.

To answer those above — no animals are getting in the way and it has been raining but that shouldn’t do it.

 

[Doubeleive]

I have read about this before on the 2015+ and in most instances it was blamed on low battery power, odd as it may seem your battery shouldn't be going bad already, but just something to take into consideration for whatever it's worth.

 

[gSwift]

I recently got back in town from a 2 week trip and when I returned and unlocked the door on my Denali, it beeped a few times and the display showed a theft attempt detected or something like that. It was garaged the whole time. It a 2018 with 3500 miles.

 

[kiboater]

My 2016 Denali did this a year ago several times one night for no apparent reason. However it has been a year with no false alarms. Parked on an open parking deck.

I wonder if the computer records which sensor caused the issue and the dealer could focus on a repair based on this info?

 

[MaizeNBlue98]

I have the very same problem. However, mine goes off with vibration, I think... I park my 2018 Denali about 10 yards from a commuter and freight train line. During the week it goes off a couple random times every week. Seems to go away if I turn off the motion sensor for some reason. No other resolution found yet.

 

[Colorado_Coonass]

I had a bug flying around in mine one night, it drove me crazy.

 

[ATX 14]

I would start with the battery. Check the battery terminal connections to ensure they are tight. Either a bad battery or loose terminal connections can cause the alarm to go off for no apparent reason.

 

[Koganinja]

Came across this post a few times while dealing with a random alarm the last few months(multiple times a day). A few notes in case someone is reading this from the same situation I was:
1.If you use the actual key blade (take it out of the fob, put it in the driver door, and turn) it will lock but not arm the alarm system.
2 .Buy a scanner. (I think I searched “gm tech 2” on Amazon.) I bought one specifically listed for “gm” for about $150. Or get it scanned at a dealership, which might cost more than a scanner, but it’s simpler if you’re not tech inclined. On scanner, under BCM there is a “content theft alarm” that lists the alarm trigger history(my scanner shows the last three). Mine listed “hood” and that is where the problem was. Latch was sitting too low and was switching the sensor from open to close at random. Hope this helps someone. Get it scanned, don’t waste your time on a wild goose chase.

 

[Pivot]

This is interesting. I am not experiencing this issue (knock on wood), but one of my rear defroster tabs broke off maybe three years ago. I took the opportunity to break the other one off, and then tucked the wires behind the trim panel (hated the exposed wires bouncing around, and I literally never have a need to use the rear defrost). Never had a weird alarm problem.

 

[swathdiver]

Mine was going off at the same time every night for a while. I figured it was the neighbor activating the massaging seats in his Lazy-Boy recliner and pushing the buttons on his ROKU remote control! LOL

 

[ohgoodforyou]

Check that the rear defrost wires haven’t become loose or unsoldered.

 

[Sparksalot]

Mine went off the other night while camping. I figured it was the curious elk bulls that we had spent the evening watching and being watched by.

 

[ilovehoes2]

Last time I had an issue with this, oddly enough it was an issue with the ignition switch. GM ignition switches cause some wonky issues.

 

[kgwmu]

reviving an old post. My wife's 2019 Yukon XL Denali has gone off about 10 times this morning for no apparent reason. Once I realized it was ours I went to see what was going on. I popped the hood and heard a relay clicking, it turned out to be number 92 under the hood listed as the ECM relay. Anyone have any idea if there's did the same or if I have something else going on?