Cummins ISX12 CM2250 (2010-12) Fault Code: 2637 (X) PID: SID 380 SPN: 5018 FMI: 11 Aftertreatment Diesel Oxidation Catalyst Face Plugged- Root Cause Not Known

Circuit Description
The aftertreatment temperature sensors are used by the engine control module (ECM) to monitor the engine exhaust temperatures in the aftertreatment system. The aftertreatment temperature sensors are thermistors and change resistance based on the temperature being measured. The ECM provides a 5 volt reference voltage to the sensor. The ECM monitors the change in signal voltage and converts this to a temperature value.

Component Location
The aftertreatment diesel oxidation catalyst is located in the exhaust system. The location of the catalyst can vary, depending on the original equipment manufacturer (OEM). Refer to the OEM service manual.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running and active regeneration of the aftertreatment diesel particulate filter is occurring.

Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the intake face of the diesel oxidation catalyst was plugged with soot.

Action Taken When the Fault Code is Active
The ECM logs the fault code immediately when the diagnostic runs and fails.
Active and stationary regeneration of the diesel particulate filter will be disabled.
Exhaust Gas Recirculation (EGR) valve operation will be disabled.
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
Perform INSITE? electronic service tool Diesel Oxidation Catalyst Maintenance Reset procedure found under the Aftertreatment Maintenance section of Advanced ECM Data.
The fault code status displayed by INSITE? electronic service tool will change to INACTIVE 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
This fault code is set when the inlet face of the diesel oxidation catalyst is detected to be plugged with soot.

Possible causes of this fault code include:

Engine oil or fuel plugging the front face of the aftertreatment diesel oxidation catalyst.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.

For intermittent power supply and data link communication issues with aftertreatment components, it is highly recommended that the OEM Power Distribution Center fuses and relays be thoroughly checked for loose, missing, or intermittent connections.

NOTE: This fault code is only used to assist in troubleshooting Fault Codes 3151, 3543, and/or 3582.

Possible Cause:
1) Aftertreatment Injector
2) ECM calibration