Hi
Replace 12v battery.
That's it.
Bet it works.
I have had mine 7.5 years.
Poor 12v battery causes all kinds of weird symptons and codes, plus head scratching.
Starting year 8 of ownership.
No problems relating to EV tech so far.
Had a few funnies codes etc.in year 4
All solved
by changing 12v battery.
Same with my Ampera hybrid.
lots of false alarms caused by 12
v battery issues.