Nissan Motors has expanded a North American recall of its Altima sedan to nearly 878,000 vehicles due to a secondary hood latch that may fail and cause the hood to fly open while the car is in motion, according to Reuters.

Nissan designed the Altimas with a secondary latch to keep the hood down if the main latch isn't engaged. For model years 2013 and 2015 Altima sedans the latch may not hold properly.

Affected vehicles were made from March 6 2012, to Dec. 31, 2014.

"Altima drivers can be sure their hood will not fly up as long as they don't pull the primary hood release while driving or leave the primary hood release undone prior to driving," a Nissan spokesman said to Reuters.

This recall affects nearly 640,000 vehicles in North America, according to the automaker. It expands a previous recall from October 2014 of about 238,000 Altima sedans in the U.S. and Canada.

The automaker hasn't received any reports of injuries or crashes related to the issue yet, but there have been a couple of hood fly-ups that significantly damaged vehicles.

Nissan hasn't found what is causing the problem or how to repair it yet. The recall could be expanded again, though nothing is definite yet.

The problem will "implement an interim procedure to inspect and lubricate the secondary hood latch assembly on all subject vehicles manufactured prior to December 31, 2014 in dealer inventory prior to retail sale," Nissan told NHTSA in a company filing.

The automaker added that the recall "tentatively concludes that vehicles manufactured after Dec. 31, 2014 are not affected."

The Altima represents about one-fourth of the company's U.S. sales. Though the year is young, the Altima is the second-best-selling vehicle in the U.S. market, behind just the Toyota Camry.

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