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.
The DEF quality sensor is a smart device and communicates with the engine electronic control module (ECM) via the CAN2 communication lines. The DEF quality sensor receives power and ground directly from the battery. The sensor performs its own internal diagnostics and reports malfunctions back to the ECM via the CAN2 communication lines. The DEF quality sensor is used to measure the concentration of the DEF in the tank.