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.
NOTE:
If DTC P203F is displayed with this DTC, first perform the trouble diagnosis for the other DTC.
The After treatment DEF control module activates priming, dosing and purging of the Diesel Exhaust Fluid (DEF). The DEF supply pump assembly is responsible for transporting diesel exhaust fluid between the dosing unit and the dosing valve. A restriction or damage to the pressure line or connections can cause DEF pressure to be erratic.