General Motors has issued a GM airbag recall related to a front airbag software defect.

The GM airbag recall, announced in September 2016, affects roughly 4.3 million vehicles. At least one report mentions a death linked to the defect. Most of the vehicles are within the United States, and at least three non-fatal injuries have been reported. The vehicles are, however, being recalled worldwide.

According to the recall, the front airbag software defect may prevent the front airbags from inflating when the vehicle has been in an accident. The same software defect may also prevent the seatbelts from operating properly.

The main issue revolves around the vehicle’s sensing and diagnostic module. It is a computer within the vehicle that detects what a vehicle is doing and controls the deployment of the airbags. However, this computer can go into “test mode.” When it does so, the airbags wont inflate and the seat belts may not work.

The vehicles being affected by the GM airbag recall include: the 2014-2016 Buick Lacrosse, Chevrolet SS, and Chevrolet Spark EV. Other vehicles include the 2014-2017 Buick Encore, GMC Sierra 1500, Chevrolet Corvette, Chevrolet Trax, Chevrolet Caprice police car and Chevrolet Silverado 1500.

Additional vehicles also being reported in the GM airbag recall also include, the 2015-2017 Chevrolet Tahoe, Chevrolet Suburban, Chevrolet Silverado HD, GMC Yukon, GMC Yukon XL, GMC Sierra HD, Cadillac Escalade and Cadillac Escalade ESV.

According to reports, the GM airbag recall was announced after a 2014 Chevrolet Silverado had crashed and never deployed its airbags. GM later notified Delphi, an automotive parts manufacturing company. The two companies tested the modules at issue, then decided to issue the GM airbag recall.

The GM airbag recall is notifying its customers and allowing the software to be updated free of charge. Customers are being notified that their vehicles should be updated fairly quickly as the automotive dealerships should already have access to the software.

The alleged software fix only involves a software update, not any mechanical work. And the recall involves vehicles manufactured from Buick, Chevrolet, GMC, and Cadillac, all manufactured between 2014-2017.

GM had faced other vehicle defects in the past, including an ignition-switch defect, in 2014, that prevented airbags from deploying in some crashes. That recall had affected 2.6 million vehicles, and victims were awarded $94.5 million as a result of 124 deaths and 275 injury claims that were connected to the ignition switch defect recall.

According to the report, the National Highway Traffic Safety Administration may also force GM to recall another 4.3 million vehicles for a potentially defective Takata airbag. This would allegedly cost GM another $550 million.