Let me describe in a bit more detail how my near rear collision occurred while auto parking, and Tesla's analysis of my data log.
I back into my parking spaces every morning in the parking structure at the hospital where I work. While backing up I use my foot on the brake, releasing it and pressing it as needed to allow my 2017 Model S to "creep" slowly back wards until I am close to the wall behind me. I use the rear camera, and direct visual observation to determine my position. If I am backing up between two cars, the automatic Parking notice may come up, which is what it did last week. I normally ignore it but just out of curiosity tried it when my incident occurred. As noted when I reported this incident, the first time I tried this it worked, but the next day when I tried it a second time. In order to initiate auto park , I must keep my foot on the brake and either click the start button on the screen, or "not this time" button on the screen. Last week when I tried this, I clicked start on the screen, lifted my foot off the brake, and as soon as I noticed the alarming speed at which the back up was occurring, I quickly pressed down on the brake again, fortunately only gently hitting the back wall with no damage. Typical reaction time for something like this is between 300-500 msecs, which is probably about the total time for this entire event. I allowed the auto park to begin when I was about 3-4 feet from the back wall of the garage. As quick as my reaction time is, it would have been physically impossible for me to lift my foot off the brake, push the accelerator and then return my foot to the brake without a full force crash into the back wall within the time between hitting start and stopping the car. I reported this immediately to Tesla who downloaded the log.
After a week, my local service center, ( which I like a lot by the way) , wrote to me saying that the log indicated the the driver "pressed the accelerator." You be the judge: I believe the technician was accurately reporting what the log said, but I suggest that the reading from the log did not distinguish between the acceleration generated by its own algorithm, and me as the driver pressing the accelerator. For those of you on this forum who have been skeptical of these reports of unwarranted acceleration I invite you to try this yourself, and even if the back up speed seems to be working normally see whether you would have the time to release start the auto park, release the brake, depress the accelerator and hit the brake again without hitting a barrier 3-4 feet behind you and damaging your bumper. I am guessing that I will have few takers on this challenge as it would be a foolish and dangerous experiment to try for most of us (if you do, and you damage your rear bumper, don't blame me). I wrote back to the technician thanking him for his response, and outlining why I was skeptical of this reading.
I am sure, even with these details laid out those of you who are inveterate skeptics will continue to doubt this, but I suggest that anyone using auto park be extremely vigilant and cautious during the procedure. I for one will not be using auto park again. I park just fine on my own.