The contact owns a 2008 Pontiac Torrent. The contact stated that while her daughter was driving at undisclosed speeds, the vehicle was vibrating excessively. The ABS warning light was illuminated. The vehicle was taken to an independent mechanic, where it was diagnosed that the rear sub frame had an excessive amount of rust. The vehicle was not repaired due to the rear wheel assembly detaching from the excessive amount of rust. The manufacturer was not made aware of the failure. The vehicle remained at the residence and had not been driven since the failure. The failure mileage was approximately 165,000.