NHTSA Complaint #11701794 — 2019 TESLA MODEL S

After a recent Tesla firmware update, the backup camera (FMVSS 111 rear visibility function) stopped working. When shifting into reverse, the display shows a black/blank screen instead of the required rearview image. However, the rear camera preview feed still functions, indicating the camera hardware is intact and the failure is likely in the MCU/deserializer routing or software handling of the reverse camera mode. Tesla Service refused to investigate the firmware or signal-routing path and instead recommended a full MCU replacement at my expense without providing diagnostic logs or evidence that the update was not the cause. They closed the case and declined further review while the federally required safety feature remains inoperative. This appears to be a software- or firmware-triggered failure of a federally mandated safety system following a Tesla-pushed update, and I request NHTSA review.