I am assuming you have enough mechanical ability to remove the door panel but if not there are instructions on this site on doing that.
How to fix broken door panel 08 silverado duramax.
Indeed there is also not a replacement part.
Slide the lock into place.
Repair tips secrets only mechanics know.
Broken armrest door handle 2013 silverado ltz same crap happened to me.
How to repair chevy silverado rear door latch door won t open.
And there is not a separate part you can buy to fix it.
Poor planning from chevy.
Connect the door lock wiring harness.
Broken door panel armrest.
You would need to replace the entire door panel.
How to repair chevy silverado rear door latch door won t open.
Push in the door panel clips.
Just a bunch of cheap ass plastic holding it together.
Unfortunately it is not a simple fix.
Push in the tab on the lock.
The internals to the handle where you grab are plastic and they break up and leaves it soft and the material over the top becomes loose.
You can take a long screw driver of piece of drill rod and manipulate the lever that opens the latch to get the door open and make repairs as needed from there.
Insert and tighten the 10mm bolt behind the door handle.
Would have been an otherwise easy fix.
With 80 000 miles not something i m going to get from.
Lift the door panel into place.
May 08 2019 12 20pm.
This mod also should work on tahoes and burbs but i can not say 100 it will.
Connect the mirror switch wiring harness.
Roll the window down and carefully push the door panel away at the top right above the latch rear of door then look down inside the door at the latch and figure out which rod fell of the latch.
Here is a 5 fix for your 2008 and up crap china made door locks that half work or just quit working.