Chrysler said Wednesday that it was recalling more half a million vehicles, most of them because active restraint headrests might malfunction.
Most of the affected vehicles are in the United States.
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About 490,000 cars and SUVs will be recalled because of potentially faulty microcomputer components for headrests that are designed to move forward during rear-end crashes.
Chrysler said it is not aware of any injuries or accidents connected to this issue.
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The recall affects 2011-13 Chrysler Sebring, Chrysler 200, Dodge Avenger and Jeep Liberty vehicles, as well as 2011-12 Dodge Nitro SUVs.
Separately, Chrysler will recall about 69,000 4x4 pickups to update electronic stability control software.