Error u0100 with Check Hybrid System

Vehicle was parked outdoor for a month, rain fell during this period.
HV battery has always had p0A80 error but do start and work normally. Error u0100 is new and won't let the vehicle start but kept showing Check Hybrid system.
My scanner shows the u0100 error in 3 places:
-ECU: 7EA
-ECU: Hybrid engine system
-ECU: Climate/Heater

All error codes can be found in the attached PDF.
I have reconditioned the HV battery thinking it was the issue, and Dr Prius reads the voltage properly with no issue.
Any help will be appreciated.