The problem first surfaced in August 2015 when backing of my garage on to the street and turning a sharp left. The car lurched forward and made a grinding noise. I tried to duplicate the problem and failed. However, a few days later it did it again. On 08-21-2015, I took the car to the dealer and complained about the noise while making a left turn. They checked the vehicle out and could not duplicate noise or problem while turning left (mileage at the time 36537). As of this date 10-21-2015 the problem has repeated itself to a different degree at least 10 times. It is intermittent and hard to duplicate.

I am taking the car back to the dealer as soon as possible because I feel this could be a major safety problem.

Update from Oct 29, 2015: On 10-27-15, I took the car back to Penske Chevrolet with the same left turn problem. This time the service tech had the transmission specialist check the vehicle. It turns out there was a maintenance bulletin addressing my Impala. The problem was a loose motor mount that needed to be tightened, as well as, the upper strut fasteners, upper support struts, and the drive axle to hub fasteners. The service tech advised me this should solve the noise problem. The dealership waived the labor cost of $119.00, since he was not sure if this type of repair was covered by the drive train warranty.

Update from Nov 14, 2015: On 11-3-2015 I took the car back to the dealer and with the same complaint and added that the dash flashed the traction control needed servicing. The tech replaced the traction control harness on both front wheels. The cost was $750.32. I asked for the replaced harness an noticed it was a insulated 20 inch wire with a plug that connects to the wheel hub. The wire had a number of anchor plugs that held it to the frame. I think the wire is to short and when the wheel are turned the plugs is stresses and thus sent a poor signal to the ABS system.

This is an obvious problem and could be a danger to the driver making a sharp turn.

The tech informed the problem is known and I could get my money back if there is a recall. Also, I feel I was over charged for the repair. The replacement harness was spliced to original harness and plugged into the hub sensor.

My car started making a strange notice, but only when turning left from a dead stop. It almost feels like something is slipping, or trying to engage. I have had it at the dealership 3 times. They replaced a brake sensor, the first time, a wheel hub, the second time. I checked the transmission fluid and it was not showing on the stick, and kinda smelled burnt. I took it back to them yesterday, and they put the fluid in it, sent me home to see what happens. This is an intermittent problem, and I can also feel it in the gas pedal. It feels like there is slippage of some sort, or even something trying to engage. Frustrating :(