Brake Abs Warning Light problems of the 2010 Chevrolet Traverse

The current mileage on my 2010 Traverse is 74k. . . Driving down the highway at 60mph all of a sudden the traction stabilizer control/abs lights come on the dashboard and the car started decelerating, down to 45 mph and more. While the gas petal was being pressed no acceleration would happen. Went to pull off to the side of the road to get out of harms way, and all of a sudden the acceleration came back. The remainder of my drive the traction stablizer control/abs stayed on with no other acceleration problems, until I arrived to work. When backing out of a parking space the vehicle would not go in reverse, while giving it gas in reverse the vehicle continued to go forward. Put in park, waiting, then tried it again. The traction stabilizer control/abs lights went off and I was able to reverse just fine. Over the pas few months the vehicle has experienced only with the traction stabilizer/abs light indicators no other problems. We had taken it to the dealership and they find no codes. Could it be the sensor or now could it be the throttle body??.

On the 405 freeway at about 3:30 pm ,rush traffic doing about 65 had a car pull in my lane right in front of me and dead stopped. I had to slam my brakes to keep from hitting them ,I had no abs dash light the brake pedal locked in engage postion and would not release to allow movement had to turn vehicle off and in park in the middle of freeway to get it to release and go again. I was on vacation with wife to see grandsons. When this happen.