General Motors is recalling 18,780 2015-2016 model-year Chevrolet Sonic and Trax vehicles, along with 2013-2015-MY Spark subcompact cars, equipped with a Bring Your Own Media radio.

The affected radios may not provide an audible warning chime when the driver fails to fasten the seat belt or leaves the key in the ignition. As a result, the vehicles fail to meet all federal safety standards, according to the National Highway Traffic Safety Administration.

GM dealers will update the radio software, free of charge, to address the problem. Vehicle owners can reach Chevrolet customer service at (800) 222-1020. GM’s number for this recall is 45340.