My vehicle was in motion driving on the freeway at 70 mph when all of the sudden my car lost power to 30 mph all the way down to 5 mph.I pressed on the accelerator trying to gain speed without success the car did not accelerate more than 30 mph, no matter how much I pressed on the accelerator. When I looked down at the dashboard I saw two warning lights go off "stability sys disabled" followed by "reduced engine power" luckily I was able to move to safety. The road was dry and no bumps to disable stability. The traction control in this vehicle is located far from my steering wheel so I know I did not accidently hit the traction control by accident. After I was able to pull over I was advised to hit the traction control button to see if that would fix the error in the dash. That did not work. I immediately took it to the dealer concern for my safety and that of my family. The dealer has had my for several days returned my car back once stating that it was due to master air flow sensor along with the air filter once those parts were replaced I picked up my car as soon as I picked up the car and drove it around the corner I experienced the same issue. I drove it back to the dealer at 5 mph as I was not able to go any faster no mater how much I pressed on the accelerator. 2nd time the car was returned to me I was told it was just the butterfly in the throttle body and that it was replaced for a new one. I was driving away and got just a little farther than the first time when I got the same error message again I drove it back to the dealer and they told me it was a faulty throttle body they replaced that but its still having issues. I believe this to be a safety hazard while driving I want this noted in case there is a major accident with fatalities.

- West Valley City, UT, USA

In December 2010 the camshaft in the 5.3L GM engine reportedly delaminated causing one or more lifters to gall and fail requiring a new engine. I purchased a factory 5.3L engine from a GM dealer and had that installed by a certified mechanic with the assurance of a 3 year 100,000 mile warranty. 28 August my wife told me the engine was noisy. On starting the engine it was obvious that oil was not pumping through the lifters. I took the truck to the dealer on the 29th for diagnosis. On 30 August they concluded that the engine needed to be replaced. Subsequent investigation confirmed that the engine was shipped with faulty castech heads that caused coolant to seep into the oil. The engine was replaced under warranty. I would like, if it is the job of the NHTSA, to have the 5.3L engine recalled.

- Summerville, SC, USA