These error messages have occurred on my 2007 Tahoe three times over the past 5 years. The first time, the dealer replaced the throttle body sensor. The second time, no problem found :-(. Today, at the Chevy dealer who states the codes indicate the accelerator pedal sensor is at fault, $472 plus tax. Two days ago, we were 200 miles from home when the engine started stumbling, especially uphill in the mountains of Vermont and New York. made it to our hotel in Troy. Next morning, everything was fine, although I did search this blog and found the ability to turn off both Traction Control and Stabilitrac by holding the Traction Control button down for 5 seconds, until the display stated Traction Control OFF and Stabilitrac OFF. Drove without any problems the remaining trip home to PA. We'll see how long this fix lasts this time around.