Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 5655 PID: SPN: 4364 FMI: 31 Aftertreatment 1 SCR Conversion Efficiency- Condition Exists

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Circuit Description
The engine control module (ECM) monitors the NOx concentration in the engine’s exhaust gases using an aftertreatment intake NOx sensor and an aftertreatment outlet NOx sensor. By comparing these two values, the ECM is able to determine the conversion efficiency of the SCR catalyst and dosing system.

Component Location
The SCR catalyst is located in the vehicle’s exhaust system, after the diesel particulate filter and decomposition tube.

Conditions for Running the Diagnostics
This diagnostic has to meet specific engine and aftertreatment conditions to run and complete.

Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the NOx conversion across the SCR catalyst was less than expected.

Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
Conditions for Clearing the Fault Code
It is necessary to use the “Reset All Faults” command in INSITE™ electronic service tool to clear this fault and extinguish the amber CHECK ENGINE lamp and/or Malfunction Indicator Lamp (MIL).

Shop Talk
Troubleshoot all other active NOx sensor and SCR dosing system related fault codes before this fault.

Possible causes of this fault code include:

Malfunctioning diesel exhaust fluid dosing system
Exhaust system leaks
Malfunctioning SCR catalyst
Degraded, diluted, or incorrect diesel exhaust fluid
For unit that has come back into with repeat failures consider the possibility that customer is not using Ultra-low sulfur Diesel fuel

Possible Cause:
1) DEF fluid
2) ECM calibration

Categories Cumminz, DTC TRUCKS, Tags , 1, 2018, 31, 4364, 5655, Aftertreatment, CM2350, Code, Condition, Conversion, Cummins, Efficiency-, Exists, Fault, FMI, Newer, PID, SCR, SPN, X119B, X12

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Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 5655 PID: SPN: 4364 FMI: 31 Aftertreatment 1 SCR Conversion Efficiency- Condition Exists - EcuForce Truck (2024)

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