Make: Cummins
Engine: ISM CM875 (2003-06)
Fauld Code: 2359
PID: P411
SPN: 411
FMI: 0/16
Description: EGR Differential Pressure Sensor – Data Valid but Above Normal Operating Range
– Moderately Severe Level. EGR differential pressure sensor failed automatic calibration
procedure or EGR differential pressure reading not valid for engine operating conditions.
Troubleshooting:
Update: Prior to running INSITE™ electronic service tool, verify that the ECM has the correct
Calibration Software Phase. There have been changes in the calibrations that reduce false
occurrences of the fault code and also affect the tolerable sensor range.
The ECM Calibration Software Phase can be checked in INSITE™ electronic service tool,
under Features and Parameters.
1)Expand the selection for System ID and Dataplate, then go to Calibration Information.
2)ISX Engines with CM870 built during and after January 2004 require software phase
06050402 or greater from the February 2007 INCAL™ DVD or newer.
3)ISX Engines with CM870 built before January 2004 require software phase 05050000 or
greater from the April 2007 INCAL™ DVD or newer.
The ECM Calibration Revision History can be found at:
http://insite.cummins.com/insite/tools/incal/index.html
This is a warrantable calibration change.
Possible causes:
1)A plugged or leaking low or high EGR differential pressure tubes
2)A damaged EGR differential pressure sensor
3)A stuck open or closed EGR valve
4)A damaged EGR connection tube hose
5)A leak in the EGR connection tube hoses or tubes
6)A damaged variable geometry turbocharger
7)A damaged variable geometry actuator
8)A damaged turbocharger control valve
9)A damaged turbocharger control shutoff valve
10)A plugged turbocharger control shutoff valve filter
11)A leak in the air line supplying air pressure to the turbocharger control shutoff valve,
turbocharger control valve, or variable geometry actuator
12)Incorrectly installed EGR differential pressure tubes
13)Incorrectly installed EGR differential pressure sensor
14)Expanded exhaust gases trapped in differential pressure tube
15)A damaged EGR cooler that allows coolant into the crossover tube and EGR differential
pressure sensor tubes.
If Fault Code 2359 is active after a key cycle and the engine is not running, it will be set
inactive only if the following conditions are met:
1)Engine coolant temperature is greater than 67°C [153°F]
2)Intake manifold air temperature is greater than 7°C [45°F]
3)Keyswitch transitions from ON to OFF for 30 seconds
4)EGR differential pressure sensor reading is within a set calibration threshold near zero.
Possible repairs:
1)Tighten any loose connections and clean the battery terminals.
2)Tighten the fittings, replace the EGR differential pressure tube and the adapter, or correct the
exhaust leaks.
3)Install the EGR differential pressure tubes correctly.
4)If coolant is found in the EGR differential pressure sensor tubes, they must be replaced.
5)Install the EGR differential pressure sensor correctly.
6)Tighten the differential pressure tube fittings.
7)Replace the EGR valve.
8)Repair leaks.
9)Replace the turbocharger control valve.
10)Replace the turbocharger assembly.
11)Replace the turbocharger actuator.
12)Repair the air supply from the OEM air tanks.
13)Replace the turbocharger.
Make: Cummins
Engine: ISM CM875 (2003-06)
Fauld Code: 2376
PID: P412
SPN: 412
FMI: 4/4
Description: Recirculated Exhaust Gas Temperature Sensor Circuit – Voltage Below Normal or
Shorted to Low Source. Low signal voltage detected at EGR temperature circuit.
Troubleshooting:
Beginning with ESN 14039654, the temperature sensor return circuit was separated from the
pressure sensor return circuit. For ESNs prior to this and with engine wiring harness Part
Number 3682854, refer to the Common Pressure/Temperature Sensor Return Circuit above.
For this ESN and greater or for any other engine wiring harness part number, refer to the
Separate Pressure/Temperature Sensor Return Circuit above.
This fault code is set active if the sensor signal voltage is below the normal operating range for
the sensor and the ECM has commanded the EGR valve open. This fault code will not be set
active if the ECM has commanded the EGR valve closed. However, once the fault code is set,
it will remain active independent of whether the EGR valve is open or closed.
The EGR temperature sensor shares return wires in the engine harness with other sensors. A
shorted return can cause multiple fault codes to be active. Before troubleshooting Fault Code
2376, check for multiple fault codes.
Possible causes:
1)Signal shorted to ground in the harness or ECM
2)Signal shorted to return or ground in the sensor.
Possible repairs:
1)Replace the EGR temperature sensor.
2)Replace the ECM.
3)Repair or replace the engine harness.
Make: Cummins
Engine: ISM CM876 (2007-09)
Fauld Code: 2754
PID: 81
SPN: 81
FMI: 16
Description: Engine Particulate Filter Inlet Pressure – Data Valid but Above Normal Operational
Range – Moderately Severe Level. Excessive black smoke has been detected exiting the
engine and entering the aftertreatment diesel particulate filter.
Troubleshooting:
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision
history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If
necessary, recalibrate the ECM.
Possible causes:
1)Boost leaks in the charge air cooler plumbing
2)A malfunctioning variable geometry turbocharger (VGT)
3)A malfunctioning exhaust gas recirculation (EGR) valve
4)A malfunctioning in-range EGR differential pressure sensor
5)A malfunctioning in-range boost pressure sensor
6)A malfunctioning in-range barometric pressure sensor
7)A cylinder misfire or overfueling.
Possible repairs:
1)Repair or replace the leaking component.
2)Clean or replace the charge air cooler.
3)Replace the intake manifold pressure/temperature sensor.
4)Replace the barometric pressure sensor
5)Tighten the fittings, or replace the EGR differential pressure tube.
6)Replace the EGR differential pressure sensor adapter.
7)lace the injector if necessary.