DTC Description: Notes
WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
Urea heater relay supplies heating power for the DEF Dosing Control Unit. The DEF Line Heater supply and ground circuits are controlled by the DEF control module. After treatment DEF Line heating is based on the input of the ambient temperature sensor. Heating of the line is initiated when the ambient temperature is below 0 degrees Celsius. The DEF control module reports status and issues back to the Engine Control Module (ECM) via CAN communication.