GM issued a recall for EV600s over faulty battery pack seals.
insideevs.com
"The recall affects 735 GMC Hummer EVs, but also 89 BrightDrop EV600 electric vans, as both vehicles are built on General Motors’ Ultium platform and have similar battery packs (manufactured by Magna). The automaker says it is aware of three instances when this manufacturing defect caused problems.
GM notes that the root cause of the issue has to do with improperly primed or electrocoated battery pack flanges “inhibiting proper adhesion of the urethane sealant.” The recall report published by the National Highway Traffic Safety Administration (NHTSA) adds that “vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall.”

2022 GMC Hummer EV Recalled For Battery Pack Sealing Issue
This is the second time this year that GMC has had to come up with a fix to stop water seeping into Hummer EV battery packs.

GM notes that the root cause of the issue has to do with improperly primed or electrocoated battery pack flanges “inhibiting proper adhesion of the urethane sealant.” The recall report published by the National Highway Traffic Safety Administration (NHTSA) adds that “vehicles equipped with high voltage battery pack enclosures produced outside of the supplier’s suspect manufacturing window are not included in this recall.”