Vehicle category: passenger vehicles.system: tires; firestone gran champion, size h78-15.consequences of defect: continued use may result in a loss of air from tire,loss of vehicle control and an accident.note: separation may be indicated by a slight bulge in the shoulder area or byvibration during vehicle operation.dot ID numbers: hyvxchj291, hyvxchj311 and hyvxchj311. Tires must also have themold identifying stamp "C2L" or "C2R".