all the locks work but the back door only open with the key what my be the problem
the back door on 2001 Dodge Grand Caravan
You may have a problem with the door lock actuator in the back door of your 2001 Dodge Grand Caravan. The actuator is an electrically operated device which moves in and out on command to lock and unlock the door. There could be a wiring issue to the actuator or the actuator itself may have failed.