Reductant Heaters

The reductant heaters maintain the diesel exhaust fluid (DEF) in a liquid state during cold ambient temperatures. There are two heating elements in the system, each receiving voltage from the reductant dosage control module (Transit Connect) or the glow plug control module (GPCM) (all others). The reductant pressure line heater is integral to the reductant pressure line. The reductant tank heater is integral to the reductant pump assembly. For additional information on the reductant tank heater, refer to the REDUCTANT PUMP ASSEMBLY  description.