Wentz was seen rushing to pick up Bronx, who was being cared for by a nanny when the accident occured in Cold Water Canyon.
"It was a minor fender-bender, and everyone is fine,” the couple's rep tells PEOPLE.
Several hours after the accident, Wentz posted a message to fans on Twitter saying, "Thanks you guys for your concern. no one was hurt in the car accident and bx is currently back to building forts and hiding dads cellphone."
Details of the incident were not immediately available.