Daimler Trucks of North America LLC (DTNA) is recalling certain model year 2011-2015 Freightliner Cascadia and M2 trucks manufactured June 2, 2011 to October 23, 2014. The vehicles are not in compliance with the requirements of the Federal Motor Vehicle Safety Standards No. 303, “Fuel System Integrity Of Compressed Natural Gas Vehicles.” Specifically, the tail pipe on these vehicles terminates under the compressed natural gas (CNG) tank and can overheat the fuel system.