Slider won't open
The slider door on my 2014 Ram Promaster (2500-high roof, 136" wheel base) won't open from outside. Is this a common problem? The garage I bought it used from in May 2017 has tried repeatedly to fix it. Everytime he thinks it is fixed, it might work once or twice. Then the only way to open it is from inside. I plan to use this door as my main door while camping in it. I haven't started on a build-out because we can't get the door to open right from outside. Any idea?
ProKat,
This is super common on the 2014 PM
I have had the same issue on both outside and inside handles x 2 cause I have dual sliders. The dealer had to go through a learning curve to get it solved under warrantee (the dealer has access to tech support from FCA).
I did not ask them what they did to fix it unfortunately but, after taking apart all interior panels to insulate and having a good look at the length of cable actuators its pretty clear that as speculated here its just cable elongation. As mentioned here their is some adjustment designed in but, it would not surprise me if the cable on the 2014 and 2013 was speced to long. If I have issues again I will shorten the cable myself and re-crimp/swage a new stopper on the cable.
ProKat, on the bright side if you are starting a DIY camper this is a good opportunity to jump in and get your feet wet

dig in pull that interior panel off (buy yourself a pushpin/christmas tree plyer puller thingy to pull the panel) and have a look!
Ask your Mechanic to call FCA for direction.
Cheers,
Dave