The recall in the U.S. and Canada affects Ford Focus electric cars from 2012 and 2013, and the C-Max hybrid from the 2013 model year. The cars have push-button starting mechanisms.
Ford said the cars don't comply with U.S. regulations requiring the chime. No crashes or injuries have been reported because of the problem.
Ford dealers will modify software starting next week in order to make the chimes sound properly.