My passenger door won't lock. And when I'm driving it acts locks and unlocks on 2001 Mercedes-Benz ML320

It kinda bounces up and down and all the other locks will lock but the passenger door

sounds like there is an issue with the door lock actuator,have that ck'd
Thank you are right it is the actuator... Do you know about how much the parts cost for a mercedes 2001 ml320
no i don't but at times the dealer is not that bad,call with your vin# and ck
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2 more answers , 1 more comment
It sounds as if internal door lock motor seems to be binding. Agreed have that inspected.
You need to replace the actuator on the passenger door. Or watch this tube on shot gunning. You can simply stick a toothpick in front of the lock. this is a temporary fix
What do you mean watch this tube on shot gunning?