Steering Noise problems of the 2010 Buick Enclave

/ I am driving my Buick Enclave and the moment I move my steering wheel a noise like a very loud hum starts, I either when parking it is very embarrassing for me because everyone is around me they turn and criticize me because I am not going to the mechanic to repair my Enclave and another problem I have is that the back door if it opens with the control but when trying to close it if it goes down to close but becomes open again it is as if there was an obstacle that does not let it close completely.

The power steering stops working intermittently. Without warning, the ability to steer the car becomes very difficult. This happens mostly in turns in intersections. Turning the vehicle back straight out of a sweeping 90 degree turn is almost impossible until a 5 to 8 second pause elapses. This is extremely dangerous, usually causing the driver to brake heavily in an intersection for what looks like no apparent reason. This is dangerous not only because of the lack of driver control, but you never know when it's going to happen. This is becoming more frequent and it can be purposefully reproduced if the steering wheel is turned rapidly while at a low speed. Also noticeable is a strange noise coming from the steering column just below the steering wheel at times, heard mostly at low speed in a quiet environment. It is a tiny somewhat vibrational sound similar to running your finger across the teeth of a very fine toothed hair comb. While this noise is noticeable and it can be felt in the steering wheel, it is not an indication that the steering is preparing to fail at that time. The noise comes and goes. . . It feels almost electrical in nature. The power steering pump reservoir has been checked and is full. The serpentine belt driving the pump is in good condition and has been determined to not be slipping. The rack and pinion is mounted securely and is not leaking externally.

Tl-the contact owns a 2010 Buick Enclave. The contact stated that when the ignition was turned to the on position the service engine warning indicator illuminated continuously. The vehicle was taken to a dealer where it was diagnosed that the timing chains failed and needed to be replaced. The vehicle was repaired. One week later the contact observed a leak from the front of the vehicle. The vehicle was taken to a dealer where it was diagnosed that the water pump needed to be replaced. The vehicle was repaired. Two days later while driving at various speeds there was an abnormal noise coming from the steering wheel. The vehicle was taken to the dealer where it was diagnosed that the power steering pump needed to be replace. The vehicle was repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 59,000. Sg.

My steering completely sticks when turning either left or right at slow speeds. I have heard other Buick Enclave owners having the same issue right around 60,000 miles and around the make/model year 2010. There are over 200 complaints on edmund's Buick Enclave forum "power steering noise". It is frightening because it doesn't allow you to properly make the turn. I have taken it into my Buick dealership to confirm the issue and they did confirm that there are issues with the steering pump.