Just wanted to allow Gen 1 Oqners of a new GM Volt service bulletin put out on Oct 12 , 2021 that may help some of you if all of a sudden your Li-ion battery did not charge last night and now you are on Gas and no matter what you try to do the Level 1 or Level 2 charger will not charge. Otherwise you aren't disabled, but you have to burn gas even to charge the Li-ion pack back up a few miles. My VOLT has 71, 569 miles and it is a 2015. Previously ,it has been flawless,but that message showed up last week and no it was not low on coolant. I added the dexcool for the Battery cooling to the above black line ( which is 1.5 to 2 inches above the mid tank seam). I had talked to my dealer from which I purchased this as a used Chevy Volt with 48 , 593 miles when I bought it in 2018 , October. My dealer was interested in finding a solution for the problem. I drove it 82 miles on Gas to the Dealer with no issues and left it until they called me 3 days later advising me of a resolved problem and they found a new bulletin issued for this kind of problem and resolve . Chevrolet paid the entire bill. How sweet is that.