There are micro switches in the tailgate called tailgate ajar sensors, they are attached to the tailgate latch, one or both of them is defective.
Probably just a bad sensor at the tailgate that tells the vehicle the door is closed. Could be a contact closure switch. Same problem but different type of contact.
SOURCE: have 2008 dodge grand caravan
contact on the sensor for the door could be bad or you need a new sensor
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