I purchased my 2013 Sierra SLT new and it continues to lock the doors on it's own.
I have locked my keys in several times, but now I always take them with me when I get out.
It has happened numerous times to both me and my wife, so it is not the key fob.
I've taken it into the dealer many times and they have replaced the drivers door switch and the BCM. It continues to lock on its own.
Has anyone else experienced this or have any ideas what else we can try?
Thanks for your help.

 

Any chance the Onstar is doing it? Or that maybe your truck is getting somebody else's Onstar commands?

 

Thanks Chris,
I will bring that up to the service dept. as it is in the shop again.
I do not subscribe to OnStar.
Thanks