2000 Buick Park Ave.

Wheel bearing is bad and causing the wheel speed sensor to give a reading of 0 when turning causing the vehicle to think the tires are slipping causing the vehicles traction control to reduce power at the wheel to the point where the car doesn't have enough power to pull itself through a corner. As far as danger at high speeds it will be no different than letting off the gas. The shop needs to hook up an abs compatable scanner that can live stream the wheel speed sensor readings and have you drive it in an attempt to duplicate the issue while the mechanic sits in the passengers seat watching the scanner.