This is exactly the same
problem I have at the moment (been watching this thread for advice)
If every other door is opening and closing as it should I think I'm gonna blame the deadlock solenoid
All my doors stayed locked at one point a couple of years back, which was traced back to a wiring short-circuit somewhere behind the dash - local auto electrician just by-passed it with some new wire - but now only one door, the front passenger, won't open
In search of answers/solutions I'm going to lock and unlock the car a few dozen times tonight and see if I can get it to open....
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oh, just thought - when you pull the interior handle, does it feel like you're pulling against a strong spring or lever, or does it just feel like it would normally but the door stays shut ?
if there's resistance, it's the deadlocks that haven't opened..... if not, then something's come off/loose