Toyota has received reports that certain 2004 through 2006 model year Tundra vehicles operated in specific cold climate areas with high road salt usage may exhibit more-than-normal corrosion to the vehicle?s frame. Toyota investigated these reports and determined that the frames in some vehicles may not have corrosion resistant protection sufficient for use in these areas. This, combined with prolonged exposure to road salts and other environmental factors, may contribute to the development of more than normal rust in the frame of some vehicles. This condition is unrelated to and separate from normal surface rust which is commonly found on metallic surfaces after some years of usage and/or exposure to the environment.
