Hi so lately I’ve been having problems unlocking and locking my 03 hummer h2. Whenever I press the unlock/lock button on either remote or control panel on the doors only the driver and passenger Doors unlock and lock. Both back passenger doors no longer unlock by wireless control so I would need to unlock it manually. The back door / hatchback cannot be opened even when I press the unlock button on both remote and control panel.
Any help please?

 

I had this identical problem. I replaced the door lock actuators in both rear doors and all is well

 

I have had four h2’s - I have replaced that rear hatch actuator in 3 of the 4 (rear gate) that’s how common that one is...
here is the part you need for the rear hatch (it fits the h2, some don’t list this part number for the h2 but it’s the part.)
https://www.ebay.com/itm/201501989644

 

The one i used on the rear hatch
ebay rear hatch lock actuator