DEF Thermal Protective Cover for the DEF Injector on 2013-2018 2500/3500/4500/5500 with 6.7L Cummins. Designed by Mopar as a remedy to the Diagnostic Trouble Code (DTC) P218F and/or DTC P202E, which may be set during cold weather or when parked for long periods in temperatures below 12 degrees.