Woke up this morning to 23 degree weather and went to start the 12' volt (it was plugged in all night and has a full battery) and got the check engine light...
From what I have read, this has to do with low battery fluid level. I checked this and it looks fine to me, not full but, close-ish. So that would leave the other possibility of a bad sensor or wiring... else some have suggested reprogramming/updating the car with software... (im trying to go this route and waiting for the part to come in)
I cleared the errors and tried starting the car again... didnt get a check engine light but the HV battery is still grayed out and it went straight into ICE mode...
Question is... am I going about this right and given that it was so cold out, would it be wishful thinking that the error will go away when it warms up?