la_staca_r0n

Having the same problem on my 2014 Silverado. Try the Front passengers door switch if it works then it is most likely the drivers door lock actuator if not then most likely the BCM. I looked at a wiring diagram the door lock actuators are supplied power When the BCM see's a voltage drop from the door lock switch. To add to the complexity hit the child lock, see if it flashes a code when you do. I find when my locks are operational the child lock is also and when the door locks are not working neither is the child lock function. There is a relay in that circuit it may be worth swapping out... I took the door panel off and supplied power to the door lock actuators, they worked every time. Good luck, I've learned to deal with it.