Growth is brisk but slower than expected, causing automakers to question their multibillion-dollar investments in new factories and raising doubts about the effectiveness of federal incentives.
The company, a General Motors subsidiary, has hired a law firm to investigate how it responded to regulators, as its cars sit idle and questions grow about its C.E.O.’s expansion plans.
With tentative agreements in place, a six-week strike against Ford, General Motors and Stellantis could soon come to an end. But the union’s rank-and-file members still need to approve the deals.