The National Highway Traffic Safety Administration has closed an investigation into what was causing fires in some GM Lords-town-made Chevrolet Cruzes.
The move comes after the automaker launched a recall that allows owners to bring in their vehicle for repairs.
An investigation announced in April into what was the cause of at least 25 Cruze fires found that oil change procedures could result in oil spilling or dripping on engine shields beneath the vehicle. The dried oil then could come into contact with the hot shield, ignite and burn, leading to a possible engine compartment or vehicle fire.
GM in June announced a recall of all Cruzes made from Oct. 2, 2009, through May 31, 2012, so owners could take them to local dealerships to have the engine shields modified to prevent oil, hydraulic fluids or other contaminates from falling on them. The recall affected approximately 413,148 vehicles.
GM spokesman Adam Adler said Monday that Cruzes made after June 1, 2012, had the modification built into the vehicle.
"There is no time limit on safety recalls," Adler said. "However, we encourage the repair be done as soon as possible."