Tell us more .. Is there a aftermarket for 2006 gmc yukon xl slt .
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directed-viper 4g gps smart start & 5906v, glass sensor, tilt sensor. not cheap but much better security, full control via the phone app or pc (from anywhere), 1 mile 2-way feedback remote fob, gps tracking, digital fence. Has lots of options you can add a motion sensor and a speaker and have it warn anyone that even walks by it, roll up/down windows, or just about anything you could imagine via relays it has optional channels for those kinds of accessories
the only thing it doesn't do that onstar could is shut the vehicle down if they managed to circumvent the alarm which is dam near impossible without triggering something, if the alarm triggers then the car horn and outside siren and inside siren goes off, the fob sounds a alarm and vibrates, the phone app sounds a alarm, I get a text and a email (all at the same time), if I need navigation I just use wireless android auto which is all voice command thru a pioneer nex w8200
it's only now on the 2021's that they are finally getting wireless android/apple
that factory radio/nav was the first thing that I yanked out
I added the optional flashing interior led's which 99% of thieves will simply walk away from there looking for easy prey.