General Motors told its dealers in Canada and the U.S. this week to stop selling all 2013 and 2014 Chevrolet Cruze vehicles over a potential defect in air bags made by supplier Takata, according to a report by the USA Today.

"Certain vehicles may be equipped with a suspect driver's air bag inflator module that may have been assembled with an incorrect part," GM spokesmen Jim Cain said in a statement, according to the report. "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 notified its dealers of the stop-sale on June 24.

The automaker has identified approximately 33,000 Cruzes, mostly in North America, that might have been built with faulty parts from the bad batch.

Once GM identifies the issue, it can lift the order because dealers will be able to isolate cars that contain problems and sell the vehicles that are okay.

A stop-sale is not a recall, and GM has not commented yet on whether the part can be found in vehicles already sold and on public roads. A recall notice could be filed with the National Highway Traffic Safety Administration as early as next week however.

GM has already recalled more vehicles this year than any year in its history with six months left to go.

The automaker has been under intense scrutiny since February as a result of its controversial ignition switch recall in older Chevrolet Cobalt, Pontiac 6, Saturn Ion and Saturn Sky cars.

The stop-sale could hurt June sales for the automaker however. This is the second stop-sale order on Cruze vehicles this year.

The Cruze is GM's best-selling car and its No. 2-selling vehicle, after the Chevrolet Silverado pickup truck.

Over 119,330 Cruzes have been sold this year through May, which is an 18.4 percent increase compared to the first five months of 2013.

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