Adaptive +predictive cruise control malfunction causing 1) sudden vehicle acceleration and 2) Cruise on but disengaged suddenly engaged and set a higher speed than originally set. Merged into light traffic on 4 lane interstate, no other vehicles within 200yds or so. Turned on, then set cruise control at 70mph, about 10 seconds later I felt the car surge, I looked down, saw the cruise indicator now showed 80, tapped the brakes to disengage. About 2 miles later repeated the same but was watching and vehicle repeated same behavior, I turned the system off. About 2 miles later I repeated the same with the same result. Each time set to 70 and within 10-20 seconds vehicle accelerated to a self set higher speed - 80. Problem 2, a few miles later, after a merge onto another interstate the speed limit changed tried this again except this time, as a came out of the curve (doing about 45mph) I turned the cruise on, a few seconds later I look down and watch the cruise indicator turn from white (on but not engaged) to green (on and engaged) without touching the set button. On the return trip I duplicated the acceleration twice more. 4 days later dealership service called to confirm that they reproduced problem 1 and were in contact with the manufacturer for how to proceed. No warning lights or messages, dealership service stated no fault codes.
NHTSA ODI 11738770