Following several complaints of defects, the National Highway Traffic Safety Administration (NHTSA) is probing Dodge Chargers, Hyundai Sonatas and Isuzu trucks.

The Detroit News said the agency has opened an investigation into 394,000 2006-08 Hyundai Sonatas for air bag issues. It has received 83 complaints about failure of seat belt buckles, which needed to be repaired or replaced. The agency said electrical circuits or sensors inside the seat belt buckle may fail and cause the pretensioner to malfunction. Depending on the air bag deployment software, the air bag may not deploy as designed or may not deploy at all.

The NHTSA is also probing 123,000 2011-212 Dodge Charger cars for stalling issues. It has received 14 complaints of the alternator failing while driving, causing the engine to stall and not restart.

Additionally, the agency is investigating 13,000 2013 Isuzu N-series trucks for faulty brake lights. It has received two complaints of cut or broken wires at a wire harness connector.