Reductant pressure is too low when the pump is not running.
1. Use the diagnostic tool to run the reductant circuit test. 2. If the error remains, check the harness and connectors between the EEC and the reductant pressure sensor in the dosing unit for electrical failure. 3. If no electrical failure in the harness or connectors are found and the error remains, change the dosing unit. If a failure has been found and corrected, use the reductant circuit test to check that the system is working and to inactivate the fault code.
What you'll see
This failure could affect dosing accuracy and emissions
System reaction
No system-reaction text recorded.
Diagnostic depth
The reductant pressure sensor gives a value lower than the normal pressure minus a calibrated hysteresis level when the pump has not been running for the time needed to evaluate the fault.
Broken reductant pressure sensor. Electrical failure at the reductant pressure sensor.