DETROIT — Fiat Chrysler said on Friday that it was recalling 1.1 million vehicles that can roll away unexpectedly and cause injuries when the transmission is not used properly, adding to a spate of recent safety actions by carmakers.

Safety recalls in the United States have continued to mount this year as automakers react to tougher enforcement efforts by regulators.

This year’s total is unlikely to match the record of more than 60 million vehicles set in 2014 after General Motors recalled millions of small cars with faulty ignitions that were ultimately linked to 124 deaths. But over all, the pace of recalls so far in 2016 exceeds the number in a typical year before the G.M. crisis.

G.M. and other automakers, including Fiat Chrysler, have been subject to heavy fines by regulators for failing to promptly fix defective vehicles. In addition, automakers are being scrutinized by other government agencies, including the Justice Department, for their conduct related to recalls and safety defects.