The National Highway Traffic Safety Administration is telling the owners of certain trucks to not drive them.
The trucks have defective airbags made by the Japanese company Takata.
There have been many instances of those airbags exploding, causing shrapnel to fly at drivers and passengers.
This new warning applies to 2006 Ford Rangers and Mazda B series trucks.
They've already been recalled, but federal officials say not enough drivers have been getting the problems addressed.
Click here to see if your vehicle is impacted.
If so, a dealer will tow it in and repair it for free.
