Ultium powered vehicles, the Equinox EV, Blazer EV, and Silverado EV, use a wireless battery management system, meaning the pack does not rely on a traditional wiring harness the way earlier EV batteries did.

That is a real design difference, and it changes how a technician should diagnose a high-voltage fault after a collision.

There have been public reports of high-voltage system faults on some Ultium vehicles, which is exactly why accurate diagnosis before choosing a repair path matters.