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This is a TSB on your vehicle.
Power Door Lock Actuators May Fail on Chevrolet/GMC 1500 Pickup
Problem Description and Possible Solution
The power door lock actuators may become slow to operate or stop working completely and require replacement
It is a common problem across many models of cars. The usual cause is failure of one or more lock actuators but this is unusual in a 2013 model vehicle that has probably not had a great deal of use. It is also unusual for 2 actuators to fault at the same time. In any event the interior door panels will need to be removed to inspect the actuators and the wiring.
If both door locks failed at exactly the same time I would seriously doubt the actuators are the cause. It is much more likely to be another issue such as a problem with the wiring to the doors on that side of the car. However it is not possible to identify the cause without removing the door panels and checking everything. (I think the dealership is basically honest when they tell you replacing the actuators may not solve the issue because until they check everything on the 2 doors with the problem they just will not know what the cause is.)
Normally there is only one fuse covering the entire central locking system and if the fuse blows you will loose power to all door locks not just 2 of them.
Sounds like body computer is malfunctioning or the module that controls the door locks lost it's program.Disconnect the battery for few minutes then reconnect and check.In some cases this resets the system computer and all starts working.But if that does not helps then problem has to be checked with the power door lock system.Either a power door lock actuator or the power door lock switch.
Usually the most common problems with power door locks are the actuators. They are small electric motors used to lock and unlock the car doors when activated by a switch or remote. Like any electric motor sooner or later it will fail. Replacing an actuator involves removing the interior door panel for access. Some are part of the door latch and some are independent. Either way, door lock actuators need to be replaced if they are buzzing, working only in one mode or are not working at all. if the problem is with the door lock actuator or just the switch. If a All the door locks, only work when locking and NONE of them work to unlock, then the switch is most likely the cause.
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see if power reaches the actuators when using the lock/unlock, if it does, the actuators are dead , you can test it by removing the door panel and disconnecting the wires going to the actuator and using a test light or a voltmeter on the wires, (if there is only one wire its the positive terminal)
if you can here relays when unlocking/locking check for power at door lock actuators inside doors, if you have power on lock/unlock and good earth from connector actuators are faulty.
if no power on test light when operating check output from central door lock module while operating, none coming out of module then it might need replacing.
check 30Amp power fuse for main relay under bonnet (which goes to pin 8 white/blue on module)and 10Amp gauge fuse in cab(pin 1 blue/red on module),pin 15 is also power when relay is on(red/blue) with test light, and module/ actuators.
check outputs from module pin 3 & 4
that go to door locks