Smart Fortwo safety light activates when braking and door locks disengage, possible issue with TMC or safety neutral switch on Smart Fortwo

Some Smart Fortwo owners report experiencing issues with the safety light activating when braking and door locks disengaging. These problems may be linked to a faulty Transmission Control Module (TCM), which might require replacement if transmission fluid levels or condition are inadequate. Additionally, even though the 451 model may lack a natural safety switch, some owners find it beneficial to bypass this component as a diagnostic step. A malfunctioning brake light switch that fails to detect pressure on the brake pedal can also contribute to these issues, and nudging the gear lever forward may sometimes help. Furthermore, owners are advised to ensure that all grounds are secure and to check if the gearbox is in neutral, as these factors can provide valuable insights for diagnosing the problem. Addressing these potential issues promptly is crucial for maintaining safety and functionality in the Smart Fortwo.