The CEO of the automaker Stellantis, which produces well-known vehicles such as Jeep and Chrysler, is resigning effective immediately, the company said on Sunday.

In a statement, the automaker, which is the fourth-largest in the world by sales behind Toyota, Volkswagen, and Hyundai, announced that the board of directors accepted the resignation of now-former CEO Carlos Tavares, citing “different views” that have emerged as sales in the United States have plummeted.