Every now and then my passenger doors don't unlock when I put the truck in park. Driver door unlocks every time. I've googled everything I can think of and can't find a solution. Anybody heard of this happening and have a solution?

Truck is a 2014 Sierra SLT

 

how many doors are affected?

 

Could be a couple things, happened to both passenger doors of mine.
The hanger or bar from the unlock mechanism would wear out or slip out of the plastic join on the inside of the panel.

Id try taking off my door panel and fiddling with it, im sure it'll get it open regardless.

 

All 3 passenger doors





They will all unlock if I hit the unlock button they just sometimes won't unlock when I put it in park.

 

If it affects all but the driver it sounds like the software is actually acting up not the hardware. You should be able to select drivers door or all doors. There's nothing mechanical between the doors that would cause it to consistently work at 1 door or 4.

Have you gone through the settings and reset them back to all doors? Maybe disconnect the battery and make everything power down then come back up. If that doesn't work I would suspect a module is possibly crapping out