Make: Cummins
Engine: ISX12 CM2350 (2013-17)
Fauld Code: 2754
PID: 81
SPN: 81
FMI: 16
Description: Engine Diesel Particulate Filter Intake Pressure- Data Valid But Above Normal
Operating range- Moderately Severe Level
Troubleshooting:
Circuit Description
The engine aftertreatment system monitors the soot load in the aftertreatment diesel particulate
filter. Under normal operating conditions, the aftertreatment diesel particulate filter is selfcleaning,
where soot is converted to carbon dioxide, nitrogen, and water. Under light load
operating conditions, it can be necessary to perform a stationary regeneration of the
aftertreatment diesel particulate filter. The soot load in the aftertreatment diesel particulate filter
is estimated, using the aftertreatment differential pressure sensor and the calculated soot
output of the engine.
Component Location
The aftertreatment diesel particulate filter is located in the exhaust system and is installed by
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.
Conditions for Setting the Fault Codes
Soot accumulation within the diesel particulate filter occurred at a higher rate than under
normal operating conditions.
Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs
and fails.
Conditions for Clearing the Fault Code
The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE
immediately after the diagnostic runs and passes.
Shop Talk
Possible causes of this fault code include:
Boost leaks in the charge-air cooler plumbing
A malfunction of the variable geometry turbocharger (VGT)
A malfunction of the exhaust gas recirculation (EGR) valve
A malfunctioning in-range EGR differential pressure sensor
A malfunctioning in-range boost pressure sensor
A malfunctioning in-range barometric pressure sensor
A cylinder misfire or overfueling.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring
supplied by the OEM.
For intermittent power supply and datalink 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.
Possible Cause:
1) Charge-air cooler failure
2) Barometric pressure sensor failure
3) Intake manifold pressure sensor failure
4) Exhaust manifold pressure sensor failure
5) Aftertreatment DPF differential pressure sensor failure
6) Fuel rail pressure relief valve failure
7) Loose injector high-pressure connector(s)
8) High-pressure connector failure
9) ECM calibration
Make: Cummins
Engine: X15 CM2450 X124B (2018 & Newer)
Fauld Code: 3135
PID: N/A
SPN: 3610
FMI: 2
Description: Aftertreatment 1 Diesel Particulate Filter Outlet Pressure- Data Erratic,
Intermittent, or Incorrect
Troubleshooting:
Circuit Description
The engine control module (ECM) provides a 5 volt supply to the aftertreatment diesel
particulate filter outlet pressure sensor on the sensor supply circuit. The ECM also provides a
ground on the sensor return circuit. The aftertreatment diesel particulate filter outlet pressure
sensor provides a signal to the ECM on the aftertreatment diesel particulate filter outlet
pressure sensor signal circuit. This sensor signal voltage changes based on the pressure at
the outlet of the aftertreatment diesel particulate filter.
Component Location
The aftertreatment diesel particulate filter differential pressure sensor is mounted on the diesel
particulate filter. It is a combination sensor that detects both diesel particulate filter differential
pressure and outlet pressure. Refer to the original equipment manufacturer (OEM) service
manual.
Conditions for Running the Diagnostics
This diagnostic consists of two parts:
One part runs when the keyswitch is initially turned ON before the engine is started
The second part runs continuously while the engine is running.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the aftertreatment diesel particulate filter outlet
pressure was greater than 1.5 kpa [0.22 psi] or less than -1.5 kpa [0.22 psi] at initial key ON, or
was not changing with engine conditions.
Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp and/or Malfunction Indicator Lamp
(MIL) after the diagnostic fails on two consecutive trips.
Diesel exhaust fluid injection into the aftertreatment system is 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
To validate the repair using a Diagnostic Road Test, utilize a route that incorporates both stop
and go city type driving and steady state highway type driving. It may be necessary to load the
unit for certain diagnostics in the ECM to run.
To validate the repair using a Chassis Dynamometer, utilize a routine that incorporates
acceleration and motoring events, steady state highway type operation, and load. This will
simulate normal driving and allow the diagnostics in the ECM to run.
Turn the key switch OFF and allow the ECM to completely powerdown.
To validate the repair, perform a key cycle and leave the key in the ON position for 2 minutes.
Then 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 amber CHECK ENGINE lamp immediately after the diagnostic runs
and passes.
For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator
Lamp (MIL) after three consecutive trips where 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:
Stuck in-range aftertreatment diesel particulate filter outlet pressure sensor reading
High resistance in the aftertreatment diesel particulate filter outlet pressure sensor signal or
return wires
Higher than expected diesel particulate filter outlet pressure
Excessive diesel exhaust fluid (DEF) deposits in the aftertreatment decomposition tube
Plugged aftertreatment outlet pressure sensor ports could cause this fault code if pressure is
held in the port after the engine is turned OFF.
Frozen, plugged, or restricted aftertreatment DPF differential pressure sensor tubes.
Note: It is possible to set this fault in a shop environment by performing a key cycle with the
tailpipe connected to an exhaust ventilation system.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring
supplied by the OEM.
Possible Cause:
1) Aftertreatment DPF differential pressure sensor failure
2) OEM harness
3) ECM failure
Make: Cummins
Engine: X15 CM2450 X124B (2018 & Newer)
Fauld Code: 3314
PID: N/A
SPN: 4765
FMI: 3
Description: Aftertreatment Diesel Oxidation Catalyst Intake Temperature Sensor Circuit-
Voltage Above Normal or Shorted to High Source
Troubleshooting:
Circuit Description
The aftertreatment diesel particulate filter temperature sensor module is a smart device that
communicates with the engine control module via the J1939 data link. The aftertreatment
diesel partculate filter temperature sensor module performs its own internal diagnostics and
reports malfunctions back to the engine control module using the J1939 data link. The
aftertreatment diesel particulate filter temperature sensor module is used to measure the
aftertreatment diesel oxidation catalyst intake temperature, aftertreatment diesel particulate
filter intake temperature, and aftertreatment diesel particulate filter outlet temperature. The
temperature probes are permanently attached to the aftertreatment diesel particulate filter
temperature sensor module and can not be replaced individually.
Component Location
The aftertreatment diesel oxidation catalyst intake temperature sensor is located in the
aftertreatment system. It is located at the intake of the aftertreatment catalyst. Refer to the
OEM service manual.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position and the engine is
running.
Conditions for Setting the Fault Codes
The aftertreatment diesel particulate filter temperature sensor module reported the
aftertreatment diesel oxidation catalyst intake temperature signal was out of range high.
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.
A default value for the aftertreatment diesel oxidation catalyst intake temperature sensor
reading is used.
Diesel exhaust fluid injection into the aftertreatment system is disabled.
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
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 amber CHECK ENGINE lamp immediately after the diagnostic runs
and passes.
For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator
Lamp (MIL) after three consecutive trips where 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 include:
A malfunctioning aftertreatment diesel oxidation catalyst intake temperature sensor
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring
supplied by the OEM.
For intermittent power supply and datalink 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.
Possible Cause:
1) Aftertreatment DPF temperature sensor module failure
2) ECM calibration
Make: Cummins
Engine: X15 CM2450 X124B (2018 & Newer)
Fauld Code: 3315
PID: N/A
SPN: 4765
FMI: 2
Description: Aftertreatment 1 Diesel Oxidation Catalyst Intake Temperature- Data Erratic,
Intermittent, or Incorrect
Troubleshooting:
Circuit Description
The aftertreatment diesel particulate filter temperature sensor module is a smart device that
communicates with the engine control module via the J1939 data link. The aftertreatment
diesel partculate filter temperature sensor module performs its own internal diagnostics and
reports malfunctions back to the engine control module using the J1939 data link. The
aftertreatment diesel particulate filter temperature sensor module is used to measure the
aftertreatment diesel oxidation catalyst intake temperature, aftertreatment diesel particulate
filter intake temperature, and aftertreatment diesel particulate filter outlet temperature. The
temperature probes are permanently attached to the aftertreatment diesel particulate filter
temperature sensor module and can not be replaced individually.
Component Location
The aftertreatment diesel oxidation catalyst intake temperature sensor is located in the
aftertreatment system. It is located at the intake of the aftertreatment catalyst. Refer to the
OEM service manual.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position and the engine is
running.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the difference between the aftertreatment diesel
oxidation catalyst intake temperature sensor data and diesel particulate filter intake
temperature sensor data did not match the expected value for the present engine operating
conditions.
Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp and/or Malfunction Indicator Lamp
(MIL) after the diagnostic fails on two consecutive trips.
A default value for the aftertreatment diesel oxidation catalyst intake temperature sensor
reading is used.
Diesel exhaust fluid injection into the aftertreatment system is 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
To validate the repair using a Diagnostic Road Test, utilize a route that incorporates both stop
and go city type driving and steady state highway type driving. It may be necessary to load the
unit for certain diagnostics in the ECM to run.
To validate the repair using a Chassis Dynamometer, utilize a routine that incorporates
acceleration and motoring events, steady state highway type operation, and load. This will
simulate normal driving and allow the diagnostics in the ECM to run.
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 amber CHECK ENGINE lamp immediately after the diagnostic runs
and passes.
For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator
Lamp (MIL) after three consecutive trips where 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:
A malfunctioning aftertreatment diesel particulate filter intake temperature sensor
A malfunctioning aftertreatment diesel oxidation catalyst intake temperature sensor
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring
supplied by the OEM.
For intermittent power supply and datalink 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.
Possible Cause:
1) Aftertreatment DPF temperature sensor failure
2) ECM calibration