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 P21CA-00 is displayed with this DTC, first perform the trouble diagnosis for other DTC.
- P21CA-00 present. Refer to DTC Description .
The Engine Control Module (ECM) provides a 5V supply and a ground to the after treatment diesel exhaust fluid pressure sensor. The pressure sensor provides a signal to the ECM on the sensor signal circuit. This sensor signal voltage changes, based on the after treatment diesel exhaust fluid pressure supplied by the dosing unit. The ECM will detect a low signal voltage at low diesel exhaust fluid pressures, and a high signal voltage at high diesel exhaust fluid pressures. Possible reduced engine performance.