Fiat Chrysler has reports of as many as 25 inadvertent air bag deployments.

Regulators found the number of inadvertent air bag deployments had fallen significantly after that.

NHTSA Administrator Mark Rosekind told reporters the recall was prompted by 400 reported inadvertent air bag deployments.

There have been about 400 reported cases of inadvertent air bag deployments in the recalled vehicles, NHTSA Administrator Mark Rosekind said.

But the NHTSA said it had reports that 39 vehicles fixed under those actions had experienced inadvertent air bag deployments, hence the new recall.