This could cause "sudden changes in the vehicle handling" which may lead to a crash, NHTSA said.
No injuries or crashes have been reported as a result of this issue, said GM spokesman Alan Adler. The problem was due to a supplier failing to complete a necessary inspection of the subassemblies it makes for GM, Adler said.
The second recall affects 3,896 Chevy Camaro, Buick Verano, Chevy Cruze and Chevy Sonic vehicles from the 2012 model year. The cars have a problem with the drivers' airbag that can prevent it from deploying in the event of a crash.
Adler said no crashes or injuries have been reported as a result of this problem.
Owners of vehicles affected by either recall will be contacted by GM and will have the necessary parts replaced at the dealership for free.