Passenger door lock actuator failed. Drivers door will not lock automatically when driving. The door can be sometimes be forced to locked manually from the manually. It’s a safety concern as a child can fall out of back door as it doesn’t open. There is already a TSB for 2015-2017 Gran Caravans (23-017-20). This extended warranty needs to be extended to 2018 as the are suffering from the same defective part. (https://static.nhtsa.gov/odi/tsbs/2021/MC-10204361-9999.pdf)