Passive door locking (2018 GMC sierra Denali)

[Jay5o]

My truck doesn’t lock when I leave it so I always have to lock it with my key.. I thought these trucks had an option to automatically lock but I’m having trouble making that work. Google says to enable “passive door locking” in the remote key unlock settings but I don’t have the “passive door locking option” so I would think it’s not an option for my truck but my truck has the option for “delayed locking” which is to delay a passive door locking.. why is my door not locking on its own? Does anyone have an idea? Also when I lock the doors they don’t automatically open like they are supposed to after pulling on the door handle twice.. I do have that feature on and it doesn’t seem to work. Can someone help me 

[MikeBMW]

Pretty sure the delayed passive door lock option is when you unlock the doors, and don't open them for 30 seconds or so, they will automatically re-lock.
Anyway, that's how mine works and I can adjust the interval with the BT Diesel AutoSync system.
For example, when I unlock all doors and the tailgate while I load groceries (a great word I just found out about), if I don't open a door, it will automatically re-lock the doors while I return my cart to the store..

Edited May 27, 2025 by MikeBMW

[carkhz316]

Only passive entry/ push start ignition GM vehicles have this feature that automatically locks/ unlocks as you approach or leave the vehicle. The delayed/ passive locking feature you may have read about is where you press the door lock button with the door open. You will then hear a chime and 5 seconds after the last door is closed the truck will lock. Any door can be opened in that 5 second window, resetting the timer before automatically locking.