Check the door switches. Do you have any lights on the dash indicating a door ajar?
Door ajar light is not on. Interior light and lights on two front doors are on by storage areas.
unplug the switches to all entries including the rear hatch until lights go out to isolate a stuck switch. sometimes they can be lubricated, most times replaced.
Also check switch on ceiling dome or cargo lights to see if one got toggled on by accident.
Looking for a Used Grand Caravan in your area?
CarGurus has 34,593 nationwide Grand Caravan listings starting at $1,995.
Search Dodge Grand Caravan Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Dodge Grand Caravan Experts