On September 21, 2026, at approximately 9:20 AM, while attempting to turn off the engine of the parked vehicle, the engine failed to shut down as commanded. Due to severe ECM misfire and erratic anti-stall compensation, the engine surged uncontrollably and propelled the vehicle forward. The Forward Collision-Avoidance Assist (FCA) completely failed to detect the obstacle, alert the driver, or apply emergency braking, resulting in an unavoidable low-speed collision and slight front-end body damage. The following day, on September 22, 2026, at approximately 2:49 PM, the vehicle abruptly triggered a powertrain fail-safe mode in traffic, forcefully restricting speed to roughly 20 mph (limp-in mode), when my wife found it when trying to running faster from a STOP mode, to prevent catastrophic catalytic converter damage caused by persistent combustion misfires. It is impossible to be the wrong operation of my wife since limp-in mode cannot be activated during low speed running. On September 23, 2026, the vehicle was taken to an authorized Hyundai dealership to apply pending TSB 26-01-068H (Campaign 9D6). While the dealer completed the software update and reported no active DTCs remained afterward, Hyundai Motor America has flatly denied manufacturer liability for the property damage incurred directly prior to this safety remedy. Hyundai's ECM software logic flaw poses a critical safety risk involving unintended acceleration, complete shutdown failure, and active safety system no