Several Mercedes-Benz model vehicles were voluntarily recalled over an issue that can cause the engine to stall while driving, according to the National Highway Transportation Safety Administration.

The recall may affect 323,963 vehicles spanning model years 2012 to 2020, Mercedes-Benz informed the NHTSA in a Dec. 23 notice. Approximately, 1% of the vehicles are believed to have the defect.

The German luxury vehicle manufacturer said it had been investigating the issue since 2018. It impacts Mercedes-Benz lineup of SUVs in hybrid, gas and diesel variations.

The company said it began notifying dealers of the recall on Jan. 03.