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Just some more information, I tested the alternator myself to verify it was charging properly, the dealer did this also. I also tried calling onstar several times to resolve message on radio, both before and after the battery draining issue came to light, the one time the guy seemed very confident he had it taken care of but it did not fix it.
Any resolution yet? I have a new 2022 GMC Sierra 2500 that has that same annoying message. Refreshing the rado did not help..
 
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