DETROIT — General Motors’ safety crisis deepened dramatically Monday when the automaker added 8.2 million vehicles to its ballooning list of cars recalled over faulty ignition switches.

The latest recalls involve mainly older midsize cars and bring GM’s total recalls in North America to 29 million this year, surpassing the 22 million recalled by all automakers last year. They also raise questions about the safety of ignition switches in cars made by all manufacturers.

In the latest recalls, GM said keys may be jostled or accidentally bumped, causing the ignition to slip out of the “run” position. The recalls cover seven vehicles, including the Chevrolet Malibu from 1997 to 2005, the Pontiac Grand Prix from 2004 to 2008, and the 2003-2014 Cadillac CTS.

The company is aware of three deaths, eight injuries and seven crashes involving the vehicles, although it says there’s no clear evidence that faulty switches caused the accidents. Air bags didn’t deploy in the three fatal accidents, which is a sign that the ignition was out of position. But air bags may not deploy for other reasons as well.

A GM spokesman couldn’t say Monday if more recalls are imminent. But this may be the end of the recalls associated with a 60-day review of all of the company’s ignition switches. At the company’s annual meeting earlier in June, CEO Mary Barra said she hoped most recalls related to that review would be completed by the end of the month.