Gunther Steiner is facing a hefty FIA penalty.
At Suzuka, the Haas boss has been summoned to the stewards to explain his radio outburst at Sochi.
A breach of code
After Kevin Magnussen was penalised for the manner in which he rejoined the track after an off, Steiner had referred to a "stupid, idiot steward".
According to an FIA statement, the outburst may have been a breach of the International Sporting Code.
The Swiss newspaper Blick says Steiner or Haas could be punished with a $250 000 fine, a paddock suspension for Steiner, or even a loss of points.
Magnussen stood his ground at Suzuka, describing the stewards as often "trigger happy".