2016 Tahoe LTZ
 

2016 Tahoe will not recognize its in park or that the brake is pressed. It will not start and will not turn accessories off since it thinks it's not in park.
Any suggestions ?? Other than take it to the dealer? It's not under warranty any more.
Thanks in advance

Did you check the fuses?

Security system reset??
 

Anyone know how to reset the security system??
I have reprogrammed the key fobs, unhooked the battery overnight and it's still not re setting.
When the battery is hooked up it will only power on accessories if you hold down the start button 10 seconds. Then it shows low fuel (but it's full) it says push brake to start
Even if you're pushing the brake. Then when you try to shut it off it says place vehicle in park. And it's in park. So the only way to shut down is to disconnect the battery.
I've read that the security system tripped will reroute a ground and lock out many starting systems including making the car think it has no fuel. Thus the low fuel light.
Any help would be greatly appreciated.
It's out of warranty and sitting at the dealer but they don't know what to do with it.

The fuses are good

post a video so we can see what's happening.
hard to say without knowing the type of shifter, shift interlock system, push button start, blade key