A method for ascertaining the re-starting capability of a vehicle, in particular when parking the vehicle, includes detecting the pressure and the temperature of fuel in a pressurized container, determining a final pressure value of the fuel in the pressurized container, where the final pressure value is an expected pressure of the fuel in the pressurized container after a period of parking of the vehicle, comparing the final pressure value with a minimum pressure value in order to ascertain whether the vehicle is capable of re-starting after the parking period, and generating a warning signal when the final pressure value is lower than the minimum pressure value.