I also have a 2012 Volt, traction battery section 3 replaced under warranty several years ago at around 57k miles. Battery Light was only indication. Now, just went out of warranty, and now it has failed again at 78k miles. Happened on freeway when switching to gas. Now it won't start. Dealer says it is section 3 again. Sounds like the section 3 is a common problem. I heard there may be a work around to clear the codes and run in mountain mode, anyone have any more info on that?
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