Less than a week after the National Highway Traffic Safety Administration had questioned the adequacy of a General Motors recall from 2009 on the Pontiac G6, saying it might have needed to be much broader, it is putting the automaker under the microscope again for another potential recall issue. This time around, NHTSA is investigating whether GM did enough in a recent recall of eAssist-equipped models, namely the 2013 Chevrolet Malibu Eco and the 2012-2013 Buick Regal and LaCrosse.

The recall was announced back in May on these mild-hybrid sedans for an issue with the generator that could cause the vehicle to stop running and possibly even lead to a fire in the trunk. According to The Detroit News, the investigation was launched because even after the vehicles were recalled, a fire was still reported. As a part of the recall, a total of 43,000 vehicles were tested, but only 22,000 received a new generator control module. The article says that the post-recall fire happened on a vehicle that had its module inspected but not replaced.