The power steering failed while operating the vehicle. Unsafe. Local GMC dealership Haggerty in Oak Lawn, IL not able to diagnose problem after fact. My safety and others were at risk. Not confirmed, as techs are not familiar with system. No warnings prior to power steering failure. Be advised, this is a hybrid pickup, and as such, does not have a traditional power steering pump system. Other GM models from the same era have had recalls, but the Silverados and Sierras were somehow omitted. The power steering assist motor has failed. Not the "brains", module.

- Evergreen Park, IL, USA

Heat sheald on exhaust manifold rusted and fell off engine resting on steering column locking steering momentarily untill I forced it to work.car was in motion when this happened.

- Newton, NJ, USA

- ÇÈÇÇ, AR, USA

Started truck up and let idle for two minutes. Upon take off, the traction control light came on and was immediately followed by the check engine light with a message stating engine reduced power. The truck then begins to run very rough and when the brakes where applied it violently and uncontrollably lunged forward. I pulled off the road, turned off the engine, and waited a minute or two. Upon restarting the engine, the check engine light came on but the reduced power message and traction light where gone. After sitting at a light for a few seconds, the symptoms where back, nearly causing me to rearend the vehicle in front of me. I pulled over again, turned off the engine for a minute, restarted and the same results as before occured. Now this happens every time the truck is running and sits in the same spot for more than two or three minutes.

- Virginia Beach, VA, USA

While driving around a highway bend in the road the steering wheel locked up and would not move going 60 miles per hour. I'm a big guy and really used all my force to turn the wheel and final got to break free with a loud pop from the steering colum area. This has happened about six time since and I now have only 20,000 miles on it. I am a shop owner and ase master tech, so I know what I am reporting this is crazy dangerous.

- Naples, FL, USA

Driving on the freeway, when truck started running rough. I managed to make it to the side of the freeway before the truck stopped working. Towed to GMC dealer. Broken throttle body sensor and broken steering position sensor connector.

- Muskego, WI, USA

The contact owns a 2011 GMC Sierra 1500. The contact stated that while utilizing the four-wheel drive mode, he attempted a left turn, but the vehicle would not go forward, until he turned the steering wheel back to the right. The vehicle was not taken to a dealer for inspection or repairs. The manufacturer was not notified. The failure mileage was 4,500. Updated 11/23/12

- Brookhaven, PA, USA

Accelerating up on ramp to MA pike with wheel turned. While merging with traffic at speed wheel locked in turned position. Forced wheel back straight with much force and a loud pop sound from steering. Due to the amount of force required, many people would not be able to unlock wheel and may crash. This has happened two times in last 30 days. Dealer refuses to make repairs, claims can not make happen when in their possession. Dealer's only instructs to pull off road next time it locks and call onstar for assistance.

- Belchertown, MA, USA

While driving down the interstate today, the steering locked in position. It took both hands to force it to turn, at which a pop was heard from the steering column area. Vehicle has driven normally since. Truck only has 1,500 miles on it. No consumer debris could have caused the problem.

- Fairview, TN, USA