As Fiat Chrysler Automobiles prepares to trade in New York on Monday, investors are souring on shares of General Motors Co. and Ford Motor Co. ahead of third-quarter results that are expected to reflect expensive U.S. recalls and sales troubles overseas.

Ford closed below $14 a share for the first time in 18 months on Thursday, amid concerns about profit pressures from rising costs and sluggish emerging market demand. GM, facing…