If it is engaged the door will not open from the inside by design.
Sliding door on 2014 chevy van not opening.
It would not move either way.
1999 gm chevy astro van sliding door got stuck open.
Step 2 remove the window crank in cars with manual windows.
If it fails mechanically like the gear stripping internally it will have a grinding or whirring noise.
If it fails electrically you will not hear the actuator try to operate when you try to lock unlock the door.
It s a poor design by chevy and the standard replacement part is ridiculously over price.
In this video i repair the side door on my 2009 chevy 2500 work van.
Check the child safety lock if the problem door is a rear door.