Factory remote start, alarm goes off in winter?

300WeatherbyMag said:

I disagree that the problem is the battery.

When diagnosing my problem last winter (2017), one of the first things I did was test the existing battery with a voltmeter. Volts never dropped below reasonable levels upon starting the vehicle (or remote starting it).

All the same, I replaced the battery with a AutoCraft Platinum H7 850CCA from Autozone. Voltage testing improved marginally, likely because my prior battery was fine. Additionally, I hard wired a NOCO Genius 4 amp 1 bank charger into the engine bay, and kept the vehicle plugged in to power every single time I parked it outside my garage.

The problem persisted despite the upgrade to the battery as well as making sure charge was properly maintained (overkill, as this is a daily driver that goes for 40-minute drives every weekday morning and afternoon, with longer ones on weekends...absolutely no reason to require a charger).

I found a workaround to the alarm sounding:

Perform the normal remote start. This is achieved by arming the alarm and pressing the remote start button. Once the Yukon turns on, I press the unlock button on the fob. I have not had the alarm sound after the remote start using this method. I don't like that my car is sitting outside with doors unlocked, but at least I'm not waking up my neighbors.

There is some sort of issue with the car alarm getting tripped at the exact moment the remote start 10-minute timer ends and the engine shuts off. Maybe a vibration, or some other electrical gremlin. I'm not sure - but I'm done trying to find it after all the stuff I tried in this thread

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• Front Shocks
• Sunroof Seal
• Front windshield

michiganlebnani said:

joining the rest of you out there.... i have a 2015 yukon xl denali.... thought i am the only having this problem but i guess i was wrong. here is my symptoms:

1. Siren goes off every time i use the remote start once the default 10 minutes are over and engine goes to sleep the siren is triggered !!!!

2. After driving the vehicle lets say for 30 - 45 min park it and use the remote to lock it (pressing twice on the remote fob) alarm will be triggered within minutes !!!! pressing the unlock and then locking it again alarm will go off again....

3. Vehicle is parked on the driveway and no rain or snow or anything .... alarm will sound in the middle of the night 2 am or so... happened several occasions again after pressing the unlock and locking it again using the remote.

The only way i am managing around it is to press the unlock button and leave it unlocked. What i noticed is the vehicle locks itself afterward on its own when i walk away and that's been ok so far. I only had one instance where the alarm went off at night using this method. When I enter the vehicle i see that "Theft attempt" message on instrument cluster display.


I owned the vehicle since OCT 2018... following service been done to it and of course at the stealership:

• Front Shocks
• Sunroof Seal
• Front windshield

inspected all locks and rear windshield side ... and nothing seems to be out of the ordinary ! however one thing grabbed my attention that similar to a previous post where someone mentioned their heated seats does not run with the remote start evern though i verified that i have this option checked the seats are always cold. but they run fine once i am and the vehicle is running. please share if any of you tried something new...

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300WeatherbyMag said:

35 degrees today, alarm went off after the 10 minute timeout of the remote start. Argh.

dkman610 - any update on your issue after the rear defogger cable fix?

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dkman610 said:

Mine turned out to be the cable that connects the rear windshield defroster, are either of those disconnected or loose or possibly coming off the window?

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