My 14 has the same issue on the rear drivers side door.
Gmc sierra rear door lock problems.
Rip off the door panels and check it out.
Cable for connection to interior door handle was much shorter than stock.
09 gmc slt dually.
The problem switched from the back door locks not working to the front not working.
That door lock piece in the door is just a plastic piece that pops in the door panel and there s a rod that goes back and forth attached to that piece to lock unlock.
There were a few small problems.
Most likely an actuator issue.
My rear door locks will not unlock front ones work fine with remote and inside control panel.
2005 ccsb lt 4x4 thumb.
Sent from my sm g965u using tapatalk.
The contact owns a 2008 gmc sierra 1500.
The contact stated that all the automatic door locks failed to operate.
I think that the relay was 12 through my local chevy dealer.
It often does not work on cold mornings but will work fine in the warmer afternoons.
Juggling keys instead of clicking a button is frustrating and in inclement weather it becomes even more of a problem.
If your gmc sierra 1500 door lock actuator sticks or stops working leaning across the seat to let someone else in is a pain.
Sometimes that rod gets to where it won t move.
1adla00178 chevrolet gmc rear driver side door lock actuator integrated latch.
Purchase a replacement at autozone to restore convenience.
The rear locks won t budge have to unlock manually.
The vehicle was taken to a dealer where it was diagnosed that the actuator needed.
A lot of times on these trucks the locks just aren t gettin pushed all the way open shut.
Gmc sierra 2500 hd crew cab rear driver side door lock actuator integrated latch.