NHTSA Complaint #11533118 — 2014 FIAT 500L

The Fiat 2014 automatic transmission on my 500L randomly does not continue to move the car when the transmission is in gear. This is a potential collision hazard to me or other vehicles. The car randomly does not move/accelerate when the gas pedal is depressed. The car coasts to a stop while still in gear and I am pressing the accelerator. I need to restart the car when this happens. From Fiat 500USA: "Cause of this issue is the GSM, manufactured Ficosa International, S.A. of Spain. Wide build tolerances within the Supervisor Microcontroller (SMC) inside the GSM can allow temperature to affect the data transfer rates. When the data transfer rate of the SMC becomes desynchronized with the Main Microcontroller (MMC), the GSM resets and the signals to the transmission may be delayed. This can result in an inability to get the vehicle out of park and/or the transmission not receiving, or there is a delay to receive, the intended gear selection." About 67251 miles while stopped in traffic the "Transmission Light came ON" . Car would not move while in gear until I turned the car off then restarted the car. The dealership replaced the transmission control module (Invoice # 25883, $1670.97) in November 2022. " P1CB1-00 Gear Shift Actuator 1 Engage Failure" code stored. The car would not move while in reverse in the dealership parking lot when I went to up pick it up after repairs. I put my foot on the brake and called Gary to come out. He came out, sat in the car and I showed him that car was in reverse but would not move. He exited the car after turning it off. I saw three failed attempts to move the car while i waited for my ride home. VALENTI ALFA ROMEO FIAT in Hartford CT. " No codes stored at this time. .. Unable to duplicate." " Based on symptoms the customer has described the next logical step would be [to] replace ... $4200 parts $1600 labor plus tax. Customer declined repairs at this time."