2001 Hyundai XG300 code B1406

PPD stands for passenger present detected. It tells the airbag control module whether or not a passenger is in the seat. If you have a B1406 code, be sure and check under the seat for books, coke cans or any other object that can interfere with the seat cushion sensing weight. If nothing under seat getting in the way, take the car to the dealer and have it checked out.