Passenger Rear Door lock acting up

[J5races]

I have noticed several time I can walk up to my locked 2018 Tahoe Premier and open the handle for the read passenger door and it isn't locked, door just opens and horn starts honking.

I locked manually from inside and then door lock doesn't unlock with other doors. playing around it seems to work sometimes and not others.

Is this a known issue that the latch assembly can fail and just replace it? Or could it be some BCM or problem elsewhere in the system?

Thank you

Jon

 

[swathdiver]

If you stand next to the door and lock it with the remote and don't hear anything, then there's something wrong with the latch/lock. The computers still think it's locked but it's not if you can open it.

 

[J5races]

So after checking fuses in all 4 fuse blocks, and replacing the whole damn lock actuator assembly it still doesn't work. The other doors are fine but the one right rear simply doesn't try. Wiring doesn't seem damaged anywhere visible. Would a BCM code show on dash or only on a good scan tool?

If I need a scan tool, can anyone recommend an inexpensive one that would show BCM codes? I have a very cheap one that shows ECU codes but nothing else.
Thank you