Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4525 PID: SPN: 5862 FMI: 16 Aftertreatment 1 SCR Intermediate Gas Temperature- Data Valid But Above Normal Operating Range- Moderately Severe Level

Circuit Description
The aftertreatment SCR (selective catalytic reduction) temperature sensor module is a smart device that communicates with the engine control module via the J1939 data link. The aftertreatment SCR temperature sensor module performs its own internal diagnostics and reports malfunctions back to the engine control module using the J1939 data link. The aftertreatment SCR temperature sensor module is used to measure the aftertreatment SCR intermediate temperature and aftertreatment SCR outlet temperature. The temperature probes are permanently attached to the aftertreatment SCR temperature sensor module and can not be replaced individually.

Component Location
The aftertreatment SCR temperature sensor module is mounted on the aftertreatment SCR catalyst.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running and active regeneration of the aftertreatment diesel particulate filter is not occurring.

Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the aftertreatment SCR intermediate temperature was above 650 C [1202 F] for 60 seconds.

Action Taken When the Fault Code is Active
The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.
The engine will be shut down if the Engine Protection Shutdown feature is enabled.
Conditions for Clearing the Fault Code
To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.
The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk
Possible causes of this fault code include:

Malfunctioning fuel injectors
A malfunctioning aftertreatment fuel injector
A malfunctioning aftertreatment SCR intermediate temperature sensor
Contaminated diesel exhaust fluid

Possible Cause:
1) ECM calibration