Wheel Bearings: Wheel bearings allow the wheels to spin smoothly. If a wheel bearing is worn or damaged, it can also cause a grinding noise when turning. Check for any play or looseness in the wheel bearings by lifting the vehicle and trying to move the wheel up and down or side to side.
Brakes: In some cases, a grinding noise when turning can be caused by a brake problem, such as worn brake pads or rotors. Check the brake pads and rotors for wear and damage.