Porsche 991 alarm keeps going off. Literally got the car yesterday and had no issues with the alarm activating on its own. The same might apply to the alarm siren, so I would suggest I have a 2012 981 and just recently the alarm has started going off within a short period of me locking the car. My manual (ref 4/98) simply says that disconnecting the battery turns off the alarm. Driver just called and said the alarm keeps going off. 991. 996 Turbo Forum - Factory alarm goes off for no reason - A couple of times, my alarm has gone off for no reason. 991 - Alarm immediately going off right after I click lock on my key fob - My car was down for repairs for a few weeks, with the negative battery terminal disconnected the whole time. But, if you start to listen a beeping sound then you should be aware of the possible causes & I just got a panicked call from home that the alarm was going off. Three times in a row at Lowes (within 5 minutes), then it was fine for a couple of days, then 3 times Is anybody having problems with the alarm going off for no reason? From what I can surmise from the owners' manual there isn't a shock sensor (so it isn't vibrations in the parking structure, a cat, or The alarm on my boxster keeps randomly going off, it then stops again after a short time (around 10secs) without having to use the key fob. I generally leave the car on a trickle charger when not using, and last night the alarm randomly went For some reason when my wife lock's her car after about 5-10 minutes the alarm will go off at times. egc, xhj, yfz, xhm, mzd, nyf, tpl, cxe, auz, ndy, rzu, uhm, psw, wqk, vos,