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DETROIT — General Motors is replacing the executives in charge of communications and human resources as it struggles with a string of embarrassing recalls that have led to congressional hearings and federal investigations.

Communications chief Selim Bingol and human resources head Melissa Howell are leaving the company to pursue other interests, the company said Monday in a statement.

John Quattrone, executive director of human resources, will replace Howell, but GM has not yet named a replacement for Bingol, the statement said. The changes are effective immediately.

GM is in the midst of a crisis over safety of some of its older-model vehicles, including 2.6 million small cars worldwide that have been recalled to replace faulty ignition switches. GM says at least 13 deaths have been linked to the switch problem. Family members of those who died say the death toll is much higher.


The switches can unexpectedly slip from the ‘‘run’’ position to ‘‘accessory’’ or ‘‘off,’’ shutting down the engine and disabling the power-assisted steering and brakes and the air bags. Without power steering, the cars become difficult to steer, and many drivers have inexplicably gone off the road or into oncoming traffic.

But GM spokesman Greg Martin said the moves are not linked to the recalls. He attributed them to chief executive Mary Barra, who took over in January, making her own hires in key positions. ‘‘The changes are part of what any company expects during periods of transition, and Mary is building her own team,’’ Martin said.

Also Monday, on a company blog Barra promised that senior leadership will react quickly to tips from employees about safety problems.

GM revealed on Thursday a program to recognize and reward employees who speak up when they see something that could affect customer safety.