Make: Cummins
Engine: X15 CM2450 X124B (2018 & Newer)
Fauld Code: 3316
PID: N/A
SPN: 3242
FMI: 4
Description: Aftertreatment Diesel Particulate Filter Intake Temperature Sensor Circuit- Voltage
Below Normal or Shorted to Low 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 particulate filter intake temperature sensor is located in the
aftertreatment system. It is located at the outlet of the diesel oxidation catalyst and before the
diesel particulate filter. Refer to the original equipment manufacturer (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 particulate filter intake temperature signal was out of range low.
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 particulate filter intake temperature reading is used.
Active and stationary regeneration of the diesel particulate filter will be disabled.
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, 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 particulate filter 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: 3375
PID: SID 115
SPN: 5397
FMI: 31
Description: Aftertreatment Diesel Particulate Filter Regeneration Too Frequent- Condition
Exists
Troubleshooting:
Circuit Description
The ECM records the time from the completion of an active regeneration of the aftertreatment
diesel particulate filter until the ECM request another active regeneration of the diesel
particulate filter.
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 only runs after successful completion of an active regeneration of the
aftertreatment diesel particulate filter.
Conditions for Setting the Fault Codes
The time between the completion of a successful active regeneration and the requests for
another active regeneration was less than a threshold.
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.
Conditions for Clearing the Fault Code
This diagnostic can not be run in the shop enviornment.
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.
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
Possible causes of this fault code include:
A malfunctioning aftertreatment fuel injector
A face plugged aftertreatment diesel oxidation catalyst
A malfunctioning aftertreatment diesel particulate filter differential pressure sensor
An engine malfunction resulting in high engine out soot.
Possible Cause:
1) Aftertreatment DPF differential pressure Sensor failure
2) Fuel rail pressure relief valve failure
3) Loose injector High-Pressure Connector
4) Aftertreatment DPF failure
5) ECM calibration
Make: Cummins
Engine: X15 CM2450 X124B (2018 & Newer)
Fauld Code: 6788
PID: N/A
SPN: 3251
FMI: 2/20
Description: Aftertreatment 1 Diesel Particulate Filter Differential Pressure Sensor – Data Not
Rational – Drifted High
Troubleshooting:
Lamp:
None
Reason:
An offset in the diesel particulate filter differential pressure sensor reading has been detected.
Effect:
Possible reduced engine performance.
Circuit Description:
The Engine Control Module (ECM) provides a 5 volt supply to the aftertreatment diesel
particulate filter differential pressure sensor on the sensor supply circuit. The ECM also
provides a ground on the sensor return circuit. The aftertreatment diesel particulate filter
differential pressure sensor provides a signal to the ECM on the aftertreatment diesel
particulate filter differential pressure sensor signal circuit. This sensor signal voltage changes,
based on the differential pressure across 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.
Conditions for Running the Diagnostics:
This diagnostic consists of two parts:
1. One part runs when the keyswitch is initially turned ON before the engine is started.
2. 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
differential pressure was greater than 1.5 kpa [0.44 in HG] at initial key ON, or is not changing
with engine conditions.
Action Taken When the Fault Code is Active:
1. The ECM illuminates the amber check engine lamp and/or Malfunction Indicator Lamp (MIL)
after the diagnostic fails on two consecutive trips.
2. A default value of the aftertreatment diesel particulate filter differential pressure is used.
3. Diesel exhaust fluid injection into the aftertreatment system is disabled.
4. Active and stationary regeneration of the diesel particulate filter will be disabled.
5. Exhaust gas recirculation (EGR) valve operation will be disabled.
6. 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:
1. 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.
2. 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.
3. Turn the key switch OFF and allow the ECM to completely powerdown.
4. 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.
5. The fault code status displayed by the diagnostic tool will change to inactive immediately
after the diagnostic runs and passes.
6. The ECM will turn off the amber check engine lamp immediately after the diagnostic runs
and passes.
7. 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.
8. The reset all faults command in the diagnostic 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:
1. Stuck in-range aftertreatment diesel particulate filter differential pressure sensor reading.
2. High resistance in the aftertreatment diesel particulate filter differential pressure sensor
signal or return wires.
3. Disconnected or damaged aftertreatment diesel particulate filter differential pressure sensor
tubes.
4. Plugged aftertreatment differential pressure sensor ports could cause this fault code if
pressure is held in the port after the engine is turned off.
5. Frozen, plugged, or restricted aftertreatment DPF differential pressure sensor tubes.
Make: Cummins
Engine: X15 CM2450 X124B (2018 & Newer)
Fauld Code: 6925
PID: N/A
SPN: 3216
FMI: 11/31
Description: Aftertreatment 1 SCR Intake NOx Sensor – Condition Exists
Troubleshooting:
Lamp:
Amber
Reason:
An incorrect NOx sensor reading has been detected by the aftertreatment intake NOx sensor.
Effect:
Possible reduced engine performance.
Circuit Description:
The aftertreatment intake NOx (Nitrogen Oxides) sensor is a smart device and communicates
with the Engine Control Module (ECM) via the J1939 data link. The aftertreatment intake NOx
sensor performs internal diagnostics and reports malfunctions back to the primary ECM using
the J1939 data link. The 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
intake NOx sensor is used to measure the NOx emissions at the intake of the aftertreatment
system.
Component Location:
The aftertreatment intake NOx sensor is mounted on the engine near the turbocharger turbine
outlet.
Conditions for Running the Diagnostics:
1. This diagnostic runs when the aftertreatment diesel oxidation catalyst intake temperature
sensor has been above 150°C [302°F] for 5 minutes while the engine is running.
2. 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 aftertreatment intake NOx reading was higher
or lower than the calculated aftertreatment intake NOx value for the 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.
Conditions for Clearing the Fault Code:
1. To validate the repair, it may be necessary to operate the vehicle on a chassis dynamometer
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or to drive the vehicle in order to get the engine load high enough for the diagnostic to run.
2. The fault code status displayed by the diagnostic tool will change to inactive immediately
after the diagnostic runs and passes.
3. The ECM will turn off the amber check engine lamp immediately after the diagnostic runs
and passes.
4. 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.
5. The reset all faults command in the diagnostic 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:
1. EGR system leaks.
2. Exhaust system leaks.
3. An incorrectly installed aftertreatment intake NOx sensor.
4. An aftertreatment intake NOx sensor that has carbon buildup on the tip of the sensor.
5. A malfunctioning EGR differential pressure sensor.
6. A malfunctioning EGR valve.
7. Excessive oil consumption.
8. Possible engine misfire.
9. The NOx sensor part number is incorrect.