2018 GMC Acadia steering problems

In motion on the highway 401 north ontario canada, the vehicle erratically increased speed and brakes were noir effective, lost control of the steering wheel which caused a massive accident involving multiple cars and resulted in multiple injuries.

The contact owns a 2018 GMC Acadia. The contact stated while driving at undisclosed speed, the steering assist reduced warning light illuminated. The contact's husband attached a portable diagnostic tester to the vehicle, and P0128 was the failure code. The contact referenced an unknown recall; however, the VIN was not associated with a recall related to the failure. The manufacturer was made aware of the failure but provided no assistance.