U.S. safety regulators may add nearly 5,000 cars to a recall of the Chevrolet Malibu Eco, Buick LaCrosse and Buick Regal sedans.
In May, General Motors announced that it would recall more than 38,000 of the 2012 and 2013 cars because a defective generator control module could stall the engine or cause a fire. The cars have GM's eAssist gas-electric hybrid system.
Unsold vehicles were not part of the recall, and GM said it would test them to make sure they were OK. But the government says there was a fire in a car that had been tested.
The agency says the fire raises questions about whether the recall should be expanded to nearly 43,000 cars.
GM says the recall is continuing and it's cooperating in the investigation.