2015 Chevrolet Suburban engine problems

Tl* the contact owns a 2015 chevrolet suburban. The contact stated that a strange odor was present in the vehicle. Several occupants endured migraines, vertigo, nausea, and vomiting while in the vehicle. Medical attention was not required. The vehicle was taken to a dealer, but the cause of the failure could not be determined. Several components were repaired, but the failure was persistent. The failure mileage was approximately 18,351.

Purchased vehicle in march 2020, have had 4 instances of making a left hand turn and vehicle shuts off. Have read that steering assist recall was done, but from what I've read this is exactly what it is doing, low speed and making a turn. Any suggestions or have others experienced same? Date is last time but has happened about 4x s now since last summer.