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Aftertreatment Outlet NOx – Data Valid but Above Normal Operational Range – Most Severe Level
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 2773 PID: SPN: 3226 FMI: 0 LAMP: Red SRT: |
Aftertreatment Outlet NOx – Data Valid but Above Normal Operational Range – Most Severe Level. The engine NOx output is higher than recommended levels. |
Aftertreatment outlet NOx sensor operation will be disabled. Engine will derate the next time that the vehicle sees zero vehicle speed. |
 Circuit: Aftertreatment Outlet NOx Sensor Circuit
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Circuit Description
The aftertreatment outlet nitrogen oxides (NOx) sensor is a smart device and receives commands from the engine electronic control module (ECM) via the J1939 data link. The aftertreatment outlet NOx sensor receives power and a ground directly from the battery. The aftertreatment outlet NOx sensor performs its own internal diagnostics and reports malfunctions back to the primary engine ECM using the J1939 data link. The aftertreatment outlet NOx sensor is permanently attached to the NOx control module. They are serviced as a single component and can not be replaced individually. The aftertreatment outlet NOx sensor is used to measure the outlet NOx emissions from the engine.
Component Location
The aftertreatment outlet NOx sensor location can vary depending on engine application. It is usually located in the exhaust system at the outlet of the aftertreatment catalyst.
Shop Talk
On-Board Diagnostic (OBD) Information (Euro 4 Stage 1+ Certified Engines):
- The ECM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- An engine torque derate will be activated immediately after the fault code becomes active.
- The ECM turns OFF the malfunction indicator lamp (MIL) after 1 ignition cycle that the diagnostic runs and does not fail. The MIL lamp and fault code cannot be cleared using INSITE™ electronic service tool.
- The fault code will be cleared from the memory after 400 days or 9600 hours of engine operation.
The NOx sensor is permanently attached to the NOx control module. They are serviced as a single component and can not be replaced individually.
Possible causes of this fault code include:
- Catalyst solution quality is not within specification, catalyst solution pump and lines external leaks, catalyst solution injector plugged or restricted, and catalyst solution lines plugged or restricted. Catalyst dosing unit has malfunctioned or become damaged
- Catalyst solution injector nozzle is partially or completely plugged.
Refer to Troubleshooting Fault Code t05-2773
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