I would love to know how this turned out, I believe my is battery also as the power slide door and rear lift gate do not work.I've been dealing with the "power sliding doors are unavailable" for a few weeks now. Often I can open one of the doors, but then cannot close it with the outside button, A pillar button, or overhead button as I get the unavailable message. I did notice that when I start the car, it is not as strong a start as it had been in the past and leads me to believe that there is some sort of battery/power issue causing this.
To add to this, my dash glitched out, went dark then back up, and then the car promptly died while I was driving. Fortunately I was in a residential area and could take the time to pull over. I got the "Service ESS" message just before it died. I was able to restart it and get it home, but when I tried to start it in the morning, I got no response from the vehicle on the first attempt. The second time it did start and I was presented with "Service Shifter" followed by "Service Emergency Brake". I let the car sit a few hours and decided to take it to the dealer. Of course it was operating correctly when I dropped it off.
It has been at the dealer for 7 days now and they think they have pinpointed the issue to the battery not having the proper voltage. They are replacing that and then mentioned that they will be doing software updates to see if that will correct any other issue. I am out of warranty by 3,000 miles so I am being charged a $160 diagnostic fee that will be applied to service credit, the battery at $170, the software updates and labor...for a rough estimate of $600 for this fix. I'll know the particulars tomorrow when they call to give me an update on the vehicle.
If I open the slide door remotely then it wont remotely close it and also my car wont start.
If I just get in the car it will start and slide gate works from. Button inside, so i think it's a battery issue, i have 33k miles on in.