GM Will Rework or Replace Keys on 3.16 Million U.S. Cars

According to a press release from the company (16 June), GM Will Rework or Replace Keys on 3.16 Million U.S. Cars.  It says that about 3.16 million 2000 to 2014 model year cars in the U.S. are affected, and provides a helpful and very brief summary of the cause of the company's present woes:

... the ignition switch may inadvertently move out of the “run” position if
the key is carrying extra weight and experiences some jarring event.

The solution?

The use of a key with a hole, rather than a slotted key, addresses
the concern of unintended key rotation due to a jarring road event, such
as striking a pothole or crossing railroad tracks.