Federal officials will investigate a potential flaw in GM vehicles that may have caused airbags to fail to deploy in thousands of fatal crashes, NBC News reported. The new investigation by the National Highway Traffic Safety Administration (NHTSA), announced Friday, resulted after a request from an automobile safety expert who says there may also be a problem with the algorithm that tells the airbags in many GM models when to deploy. GM has already recalled millions of cars because of ignition problems that have been linked to at least 13 deaths.