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Hello, can you share the 17 digit VIN number so I can check for any concerns related to the production of your vehicle?
Ok, nothing comes up as far as a technical service bullletin, you say this is doesnt happen all the time, it so doesnt affect all the doors, just some of them or it picks and chooses which ones lock at times and unlocks? have you recently done any interior work to the vehicle, add on any aftermarket equipment like a radio or replace the battery then have this problem show up?Do the autolocks work where you have the doors unlocked and the doors lock automatically when ut in gear and start driving or try disabling this function?
Ok do you happen to have any aftermarket accesories installed, an aftermarket alarm perhaps? It will unlock all the doors but the read doors wont operate except with the key fob and they lock and unlock with the key fob or key or only one or the other?
Ok the GEM (Body Control Module) controls the operation of the door locks. A diagnostic check for codes with a scan tool would need to be done to see if any codes are stored in the GEM module first. If no codes are stored. Would have to run through a diagnostic by symptom based on the concern . Being a transit, if its used for commerical use. it wouldnt be a surprise if someone bolted in an interior panel and cut of shorted a wire. Only other thing to do would be to wiggle the wiring harness to the doors while toggling the switches to see if they work properly if you wiggle the door loom harness, indiacting a broken wire inside the loom which is possible.
Very goo, yes when having a code check have them look at the live data to indicate whether a door ajar switch is reading open when its closed. that could be part of the concern since you bang on the door and it starts working and you can try sprayig wd40 into the door latches to cleanup contacts in the latches