Formula 1 tyres
F1 teams warned against coded messages
Teams were told that the use of pit boards for such messages was also banned.
The Italian company believes it will remain the sole supplier next season.
Vettel has never won in Hungary but he has been breaking new ground already this season.
A cameraman was injured on Sunday when a wheel spun off Mark Webber's car in the pit lane.
The Mercedes driver on pole for the second time in a week while team mate Rosberg drops to 11th.
Ferrari's Fernando Alonso boosted his title hopes with an unexpected third place.
Formula One's governing body is probing alleged breaches of the testing regulations.