The fault code P0AA6 – hybrid battery isolation fault is what the name suggests the wiring between units is not good, but there are sub codes and how to quickly identify what to do
SUB CODES / INF Codes
526 – vehicles orange cables are shorting somewhere water in harness plug ( corrosion ) clean harness plugs and check resistance should be in the 3 M,Ohms and higher region so the book says i usually see 30m ohms or higher or nothing at all ( ultimately )
611 – AC Compressor is shorting out ( most common )
612 – Battery is shorting out to the frame
613 – Electric Motors Shorting
614 – Invertor is shorting

Where to Find the Subcodes ?
Quick Answer is Tech Stream in the freeze frames for the Fault

Some show in the live data ( Year model Pending ).
Search for the PID ( Detail Codes 1 though 5 ) this will show you the results of the tests carried out every time you start the car, or delete the fault code it will run the tests again.

* quick hint * if you turn on the a/c and its the compressor is shorted. the check battery sign will come up on cluster quicker. and if fuse blown in inverter you will get the B1498 Fault listed below.

B1498 – Communication Malfunction (A-C invertor local)
what they don’t tell you is that it could be the fuse in the Inverter Take the cap off and look at the fuse white crystals it should still have ohm resistance to work