The automaker said the inflator module in drivers-side airbags in new or used 2013 and 2014 Cruzes may have been assembled with an incorrect part.
GM hasn't issued a recall for affected cars, according to a spokesman. The company is investigating how many vehicles may have the faulty airbag part.
"We are working diligently with the supplier of the defective part to identify specific vehicles affected and expect to resume deliveries by the end of this week once those vehicles are identified," GM said in a statement.
GM faces congressional scrutiny and multiple lawsuits for having delayed a recall of millions of Chevrolet Cobalts and other cars because of defective ignition switches. GM blames the switches for at least 13 deaths. The carmaker this year has recalled a total of more than 20 million vehicles worldwide for a range of problems.
CEO Mary Barra said in June that an internal investigation of the company's safety problem hadn't revealed any more serious problems.
GM shares fell less than 1 percent in after-hours trading, to $37.09.
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