[Amgman1]

Anyone with a bad battery yet? Apparently mine has a short and is being replaced

 

[INgolfer]

Anyone with a bad battery yet? Apparently mine has a short and is being replaced

12V or your ultium batteries???

there have been more than a few 12V issues already

 

[Amgman1]

12V or your ultium batteries???

there have been more than a few 12V issues already

Ultium

 

[azbill]

Anyone with a bad battery yet? Apparently mine has a short and is being replaced

I doubt it actually has a short, otherwise your Hummer would be burned to the ground. More likely an open circuit somewhere, or some degraded cells.

 

[StillHummer]

Ultium

Wow...that's not a good look to have issues already.

Keep us posted on updates, this will be hugely valuable to anyone who comes here in the future with a similar issue.

 

[Nebula1701]

This is probably the 2nd battery pack to have issues. GM is probably taking the whole pack for easy diagnosis. In the future they will just replace the bad module. Each module now has its own BMS instead of just a single one for the whole pack.

 

[AJRDU]

what were your symptoms?

Anyone with a bad battery yet? Apparently mine has a short and is being replaced

 

[jayswang]

Mine is currently at the dealer service with a "Service high voltage system" message. open case with TAC but it has already been a few days. Everything works as usual but the message concerned me.

 

[TRider86]

Mine is currently at the dealer service with a "Service high voltage system" message. open case with TAC but it has already been a few days. Everything works as usual but the message concerned me.

Thats basically same as a check engine light, could mean a million things. GM and TAC move slow with all the moving parts. They will send out an Engineer to do a few data dumps then finally allow the technician to work on it. Mine took 20 days approved for me to diagnose and to get a coolant heater module replaced when it was all said and done. GM just really wants to ensure they dont miss something that could possibly be a reason for failure that may help improve the product. Hopefully your vehicle gets fixed quickly.