Bought a 2013 Volt less than a month ago, got Service High Voltage System and can't charge

I have a obd reader comimg later today and a nano coming in a week or two. I'm optimistically assuming this is related to the coolant sensor issue since the battery charges and discharges normally via mountain mode.

If I understand correctly, clearing the code via obd scanner will temporarily fix the issue but will return after a drive cycle until reprogrammed via something like the nano? If anyone can confirm/offer advice please do.

The dealer offered to take it in to fix on them, but they're like an hour away and I don't wanna get a rental for two weeks for something I can fix. Plan is to use the scanner to keep clearing the code so I can charge until the nano comes, then do the reset and maybe think about ordering a resistor to bypass the sensor.

Thoughts? Advice?

Edit: Solved for now. Used a scanner to clear the code. Charged up no problem.