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C7 Corvette, H3X Hummer
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There is probably a module that isn't going to sleep when it's told to and is keeping the bus awake, leading to it draining the 12V battery because the HV battery still gets disconnected and the truck won't charge the 12V while it's disconnected. Diagnosing that sort of an issue would be a pain in the ass without very specialized tools.
They need a bus analyzer.
 
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