The contact owns a 2018 Chrysler Pacifica. The contact stated that while driving on several occasions, after the vehicle was stopped, the accelerator pedal was depressed; however, the vehicle failed to respond as needed with an abnormal clunking sound while the transmission shifted from 1st to 2nd gear. The check engine warning light was illuminated. The contact stated that on one occasion while stopped at a red light, the transmission failed to shift into 2nd gear from the 1st gear. The vehicle was pushed over to the side of the road for approximately 20 minutes. The contact then pressed the PUSH to START button twice, held the accelerator pedal for 10 seconds, turned the vehicle off for two minutes, and then restarted the vehicle. The vehicle was taken to an Auto Parts store where a handheld diagnostic tool retrieved DTC: P0732. The contact stated that the code was cleared. The vehicle was taken to the same dealer however, the dealer was unable to duplicate the failure. The manufacturer was notified of the failure. The failure mileage was approximately 30,000.