I recently got stuck in the snow at a friend's house. We tried to get my car out for about an hour. During that time I burned quite a bit of coolant for my battery. It turns out that when the coolant level is low, the error "Maintenance of high-voltage charging system" appears. That means you won't be able to charge your Volt until it's cleared. I added more coolant and waited to see if the level went down. It's not like this. So I connected the device and cleared the code and now my car is charging again! Just a warning, if you have a leak it can destroy the battery. In my case there was no leak, only the error had to be reset.
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