The recall covers the 2006 to 2010 Pontiac Solstice and the 2007 to 2010 Saturn Sky. The two-seat cars are no longer made and both brands have been scrapped by the company.
GM says in government documents that a sensor that determines if a child is sitting in the passenger seat can bend and become damaged over time. That can open an electrical circuit, causing the car to turn off the air bag.
The company says it doesn't know of any crashes or injuries caused by the problem.