Citroen would have to make a deposit of 8 million euros and provide a bank guarantee of 25 million euros for potential compensation for losses, Stellantis said in a statement.
It said Citroen was assessing its defence options.
Renault, Peugeot, owned by Stellantis, and Volkswagen France, the French unit of German carmaker Volkswagen, have also been charged in France over the dieselgate investigation.
Several carmakers in Europe have come under scrutiny since the Volkswagen "dieselgate" scandal which erupted in 2015 over test-cheating in the United States, at a time when regulators are becoming ever tougher on pollution standards.
(Reporting by Gilles Guillaume; Writing by Matthieu Protard; Editing by Edmund Blair)
