NHTSA Complaint #11715163 — 2017 FORD F-150

Frequently I will be driving at highway speeds and the truck will unexpectedly downshift. This will happen around every 500 miles. I have only had it drop from 6th to 5th/4th, never any lower at highway speeds. I have had this occur multiple times at slower speeds but it will go away. During each time the code P0720, output speed sensor, will appear and I will have to clear the code and it will work like normal again. There has only been one instance, in my 2 months of ownership, in which the unexpected downshift happened, I then came to a stop and then the truck stalled at a stop light. The truck is available for inspection. My safety and others were put at risk since I lost the ability to control my throttle making my acceleration and deceleration erratic. Also, when I was stalled at the green light it was on a road that had a speed limit of 70 which I could have been hit by another vehicle predicting me to drive away from the stop light when I could not. It hasn't been confirmed by a dealer or independent service center but matches the description of the NHTSA investigation into the issue. The vehicle component has not be inspected yet. Prior to the issue, no warning lights have popped up. It is only when the issue occurs and I feel the truck unexpectedly downshift and no longer upshift that a yellow wrench will show up with the code i had mentioned previously.