Investing.com -- The National Highway Traffic Safety Administration (NHTSA), a US automobile safety regulator, has initiated an investigation into over 2 million vehicles manufactured by Honda (NYSE: HMC ), following reports of engine restart failures.

The issue seems to occur when the vehicle is in an idle position, such as at a traffic light or road intersection, with the auto start-stop feature engaged.

The investigation was triggered by complaints from Honda vehicle owners who reported that their engines failed to restart on their own after coming to a complete stop.

According to a document from the regulator, dated March 26, some of these complainants had to resort to a jump start to get their vehicles moving again.

The NHTSA has not yet disclosed the specific models under investigation.

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