This disclosure relates to a method and system for exchanging data between users of a vehicle, including a main user equipped with a first personal electronic device and a secondary user equipped with a second personal electronic device. The method includes a preparatory phase and a transmission phase, which comprise the following steps: the application installed on the first personal electronic device sends data to a remote server including the second email address of the secondary user and instructions for the transfer of information regarding the vehicle; the remote server sends data to an information cloud including the mobile identifier assigned to the application installed on the second device and information regarding the vehicle, and the cloud sends information regarding the vehicle to the application installed on the second personal electronic device.