The vehicle spun out of control and headed towards left side while performing a routine lane change. there were no adverse weather conditions, no unusual traffic patterns, and i was not going above the speed limit. i was in the far right lane on a four lane highway, when the vehicle started veering left, i tried everything in my control to steer the car away from the median, but to no avail, my vehicle sideswiped the median, and the left rear wheel fell off. since i was trying to steer right, the wheel finally responded after sideswiping the median, and i had to steer left again to avoid hitting another vehicle, at which point, it spun 180 degrees and came to a complete stop on the second farthest left lane facing oncoming traffic. i waited for a break in traffic, and quickly pulled the vehicle to the left shoulder with only three wheels. i do not know what went wrong, as i had not done anything out of the ordinary other than performing a lane change to the next lane. the dealership claims everything looks "connected" but i believe defective part or parts caused the accident, i would appreciate an investigation to possible causes. the vehicle was brand new, and i was very careful with it, i don't believe this happened because of something i did. i have filed a report with chevrolet, and am awaiting their response. thank you.