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2019 Chevy Volt, Voltech with 7.2 kW optional Charger
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A few Hummers have had issues with "hybrid battery system" I wonder if they are still working out the kinks on the wireless communication between modules.
 

· Super Moderator
2019 Chevy Volt, Voltech with 7.2 kW optional Charger
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I would have liked to know the codes it is throwing.... @JackBurton you can call Onstar and request the codes.
 

· Super Moderator
2019 Chevy Volt, Voltech with 7.2 kW optional Charger
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I'd take that in, check if there are any firmware updates and have them check the coolant levels...
 

· Super Moderator
2019 Chevy Volt, Voltech with 7.2 kW optional Charger
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Got to remember the Hummer is the first truck with a wireless BMS... 24 of them. So it might be a firmware issue where it doesn't get as strong a signal as it expects and tosses errors.
Something that will be refined over time.
 
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