Here you go again. I really feel for you.
See:
https://ford.oemdtc.com/tag/p0aa6
and
https://static.nhtsa.gov/odi/tsbs/2014/SB-10056197-3051.pdf
And
Download the service manual I uploaded.
http://www.myfocuselectric.com/forum/viewtopic.php?f=14&t=4921
Install it.
Open it
Go to section 4:Electrical.
Click on section 14: Battery and Charging System
Click on section 414-03A: High Voltage Battery, Mounting and Cables
Under Diagnosis and Testing, click on High Voltage Battery, Mounting and Cables
A very long web page will load.
Type Ctrl+F to invoke search, and type P0AA6 in the search field.
Go to the second occurrence and start reading from there.
This is what the dealership needs to do to find out what is wrong, if it is not the technical service bulletin listed above.
Best of Luck!
