When accelerating the vehicle after coming to a stop or slowing down stumbling/stuttering occurred along with the check engine light coming on and the stabilitrak/ traction control light. Continued on into the next day with the same problems except the check engine light turned off and came back on with an oil light. Waiting on dealership to inspect. Dealership mentioned multiple cars there with the same problem.

- Moreno Valley, CA, USA

Out of know where my breaking system just decided to stop my automobile. I had brought my car back to the dealership proximally 10 times and it started about a month after I purchased it for the same problems. My new ABS system makes a loud noise once it decides to go on. I know that sometimes for example going under a bridges or going around curves could activate my system. There is absolutely no warning when this car decides to stop on its own, it happen even when there isn't cars, or curves it's just decides to slam on the brakes to stop. It when there nothing in front of my car. I don't line is this one of the apples it scares the [xxx] out of me. You can go from 50 miles an hour to zero without any warning. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Gilberts, IL, USA

I was entering a city street from a shopping mall. As I found a small break in the traffic I pulled out and attempted to accelerate. My car did not change gears. I was forced to pull off the road quickly to prevent my car from getting hit from the rear. I had been driving around all day on the interstate and various shopping centers without any indication something was wrong with my car. I had it towed to the dealership. This is the 2nd transmission problem with this car in 4 months with now with only 27K miles. It has been in the shop for 25 days now and not sure when it will be ready this time.

- Arlington, TN, USA

Car applied brakes suddenly and fully 4-5 times during 200 mile trip on I-5 for no apparent reason while adaptive cruise control was on at freeway speeds (65-70mph). It occurred randomly, while following other vehicles, including semi-trucks, which are not in same lane and/or are significant distance away. Did so without any driver input or application of brakes. Decreased speed was so sudden, it caused driver's seat belt to tense up. Fortunately, there were no vehicles directly behind mine or my car would have been rear-ended at freeway speeds, resulting in potential serious injury. I took car to dealer where it was purchased (royal moore auto center, hillsboro, Oregon (503-648-1153) on 8/9/17 and left it for day. Their technicians ran codes and drove car, but could not duplicate problem. (invoice # bucs780125). I was referred to Buick (800-521-7300) and it referred me to GM senior advisor team. Was assigned service request #8-3144154519. I spoke to service representative "christi", who told me there was nothing they could do unless the service technicians could duplicate the problem. Her only suggestion was that I return to the dealer to see if they could do that. I told her since the problem did not occur all the time, but only some of the time, that made no sense. I asked to speak with someone at GM who might have technical knowledge about this dangerous problem. She said she could not refer me to anyone at GM for that purpose. I told her (and later a second senior advisory team member- who are independent contractors and not GM employees), that I had found websites that discussed other owners of GM vehicles equipped with the forward collision alert and braking system and adaptive cruise control, ie, automatic braking systems, experiencing similar problems- their vehicles braked at the wrong time for no apparent reason. NHTSA needs to look into this asap.

- Lake Oswego, OR, USA