Diesel Exhaust Fluid Line

The Diesel Exhaust Fluid (DEF) line provides connection between the DEF injection pump and the DEF injector. The DEF line is manufactured from a plastic material which is specifically designed for use with DEF.

A copper nickel alloy resistor wire is installed within the DEF line with an electrical connector. The resistor wire enables electrical heating of the DEF at low-ambient temperatures.

The DEF line has hardwired connections to the DEF heater control unit, which actuates the power supply for the heater element. The DEF heater control unit is controlled by the Powertrain Control Module (PCM) via the private Controller Area Network (CAN) bus.