Nissan LEAF 2023 Owners Manual
9.19.3.2. System Malfunction
If the Intelligent Driver Alertness system malfunctions, the [System fault] warning message will appear in the Vehicle Information Display and the function will be stopped automatically.
Action to take:
Stop the vehicle in a safe location, and then turn off and restart the EV system. If the warning message continues to appear, have the Intelligent Driver Alertness system checked by a knowledgeable LEAF repairer such as a NISSAN certified electric vehicle dealer.
Owners Manual