The contact owns a 2021 Honda Accord. The contact stated while driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. In addition, the check engine warning light illuminated. The vehicle was taken to the dealer; however, the failure was not duplicated. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The contact stated that the vehicle was taken to the dealer several times due to the failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 28,000.