Alexander Dobrindt said in a statement today that Fiat's behavior was "completely incomprehensible" as there were "concrete allegations" against the automaker.
Dobrindt had asked Fiat representatives to meet with officials today as part of a broader probe into illegal diesel emissions controls sparked by the Volkswagen scandal. The German carmaker has admitted using software to cheat on US emissions.
The transport ministry said it received a letter from Fiat's lawyer canceling the meeting on the grounds that the company's cars are certified by Italian authorities, meaning that country is responsible for any investigation.