Reductant Heaters

The reductant heaters maintain the diesel exhaust fluid (DEF) in a liquid state during cold ambient temperatures. There are three heating elements in the system, each receiving voltage from the glow plug control module (GPCM). The reductant pressure line heater is integral to the reductant pressure line. The reductant tank heater is integral to the reductant heater and sender assembly. For additional information on the reductant tank heater, refer to the REDUCTANT HEATER AND SENDER ASSEMBLY DESCRIPTION  in this service information. The reductant pump heater is integral to the reductant pump assembly. For additional information on the reductant pump heater, refer to the REDUCTANT PUMP ASSEMBLY DESCRIPTION  in this service information.