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Mine did exactly the same thing. Bad battery, but was able to jump mine with a Noco Genius Boost GB40 and drive it to my dealer. 48AGM was the part number. I work for a company that supplies ACDelco batteries to GM dealers. Unfortunately AGM battery technology still looks like it has a long way to go by the looks of our sales figures. The best part for me is that the dealer buys it from us, gets reimbursed from GM under warranty and I get paid a sales commission for a battery for my own car.
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