Why does the gear selector light stay on with the ignition off?

The gear selector light may stay on with the ignition off due to a malfunction in the vehicle's electrical system or a fault in the gear selector switch. It could also indicate that the vehicle's battery or wiring is providing residual power to the light. Additionally, some vehicles have features that keep certain lights on for a brief period after the ignition is turned off, but if it remains illuminated longer than usual, it’s advisable to have the system checked by a professional.