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Washington — Fiat Chrysler Automobiles NV said Saturday it is recalling 322,000 cars worldwide to prevent unintended side-curtain air bag deployments after recalling about 844,000 trucks last week for the same issue.

The Italian American automaker says the air bags can deploy if vehicles doors are kicked or slammed with excessive force. Fiat Chrysler said it is aware of three potentially related minor injuries and 25 complaints of problems but no crashes. The problem is an overly sensitive front door pressure threshold.

The new recall covers the 2011-2014 Dodge Charger cars including 284,000 in the United States, 13,000 in Canada, 2,500 in Mexico and 22,000 outside North America. Until service is schedule, Fiat Chrysler said owners should use caution and not slam doors shut. The company says the problem is very rare — impacting less than 0.01 percent of the total recall population.

Last week’s recall covered 2013-2015 Ram 1500, 2500 and 3500 pickups. There were two minor injuries related to those vehicles.

Fiat Chrysler said in May it investigated whether there were problems with the Dodge Challenger and Chrysler 300, but said its probe found those cars have unique air bag calibrations and don’t need safety recalls.

Separately, the National Highway Traffic Safety Administration said Saturday it is opening a separate investigation into 2.8 million radios built by Harman Kardon International for possible hacking concerns — after Fiat Chrysler last month recalled 1.4 million of them after a Wired report showed that two hackers could take control of a 2014 Jeep Cherokee. “If sufficient similarities exist, the investigation will examine if there is cause for concern that security issues exist in other Harmon Kardon products,” NHTSA said.

NHTSA previously said it was investigating whether Fiat Chrysler’s recall fix worked and if it impacted other vehicles from other manufacturers.

DShepardson@detroitnews.com

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