Right before new year, just under 36k miles, I was driving to a fast charger (4 miles away), as I pulled up to an intersection, my range meter went from 14 estimated miles, to LOW, and then immediately told me it was out of energy and to pull over. I've been to three different dealers (including the one i bought it from, 500 miles away), I've called GM's "customer support," and to this day, there really hasn't been any resolution.
I drove back across country, weeks prior to the incident, from Bakersfield, CA to Charlotte, NC, using only fast chargers. I'm wondering if the cells didn't balance, and that imbalance is what caused the occurrence. I use torque pro, and from the lowest SOC I've been to, I didn't see any glaring cell voltage differences (granted I'm no expert). I spoke to 2 GM EV engineers at fully charged live in February, who recommended a battery test at the dealer. I took it to the dealer i purchased it from in March (500 miles away), and they told me their tech looked it over thoroughly, that there were no problems, and I would have to pay for the battery test, if it yielded no results. Given GM's less than confidence inspiring performance to date, I declined, because the vehicle is driveable, and I now have documentation from two dealers stating the vehicle is operating as designed.
I plan on doing a final test, while with a generator for backup (GM's road side assistance is a cruel joke from my experience), and if the vehicle repeats the problem, or has significant variation in min range being achieved (as measured from right before it displays LOW), I plan to invoke Lemon Law, as I've given GM adequate opportunity to diagnose and repair. Lawsuits suck, but sometimes there's no other reasonable option. I hope the test will end with not running out of juice, and give validity to my cell balancing theory.
I just wanted to throw this on the forum, incase anyone has good insight, etc.