Hyundai and Kia recalled another 534,000 vehicles engine failures and fires. This most recent recall brings the total of recalled vehicles to about 2.4 million since September 2015. The National Highway Traffic Safety Administration is also investigating the companies for being slow to fix the defective vehicles.

The recall covers 379,000 Kia Soul SUVs from 2012 through 2016 with 1.6-liter engines. Hyundai and Kia are recalling 152,000 Tucson SUVs from 2011 to 2013 and Sportage SUVs from 2011 and 2012.

Kia, Hyundai expand U.S. engine fire recalls by 534,000 vehicles