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Verify the 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, calibrate the ECM.

1)This fault code is set when the actual VGT actuator position does not meet the commanded position for more than 10 seconds.
2)Large boost pressure leaks can also cause this fault code.

The aftertreatment system must be inspected after making the appropriate repair outlined in this fault code troubleshooting tree. Progressive damage to the aftertreatment system can possibly have occurred. Perform the aftertreatment initial check procedure to test for a damaged diesel particulate filter.

1)For ISB engines, reference the ISB CM2150 Service Manual, Bulletin 4021578. Refer to Procedure 014-013 in Section 14.
2)For ISC and ISL engines reference the ISC and ISL CM2150 Service Manual, Bulletin 4021569. Refer to Procedure 014-013 in Section 14.

Inspect the aftertreatment system for potential damage.

Inspect the turbocharger vanes for residue, and clean the vanes, if required. Find the source of the residue and repair.

Possible repairs:

1)Repair or replace the component causing the charge-air system leaks.
2)Inspect the grid heater for damage or plugging. If found damaged, replace the grid heater and inspect the air handling system for debris.
3) replace the EGR cooler.
4)Replace the variable geometry turbocharger actuator.
5)Replace the turbocharger assembly.
6)Replace the damaged aftertreatment system component(s).
7)If necessary, calibrate the ECM.

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.

High voltage on the (+) 5 volt supply wire can be caused by a short to battery voltage in the engine harness or connectors, or a damaged ECM.

Possible repairs:

1)Replace the ECM.
2)Repair or replace the engine harness.

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.

There are multiple types of vehicle speed sensors. Various types include magnetic pickup, data link, digital, and tachograph. Refer to the OEM for the specific type installed on the vehicle.

This fault is set active when the ECM loses a vehicle speed signal when other engine conditions indicate the vehicle is moving. The fault can also become active if there is a series of clutch, service brake. or throttle movements with no vehicle movement. The fault is set inactive when the ECM receives a vehicle speed signal greater than zero.

Since the vehicle speed sensor is an OEM installed component, this troubleshooting procedure will not catch all malfunctions of the circuit due to components not under Cummins Inc. control. Sensor resistance values, data link speed sensors, and tachographs are not fully covered under this procedure. For more information on those components, please refer to the OEM troubleshooting and repair manual.

Possible repairs:

1)Repair or replace the OEM harness.
2)Repair or replace the gear or tone wheel.

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.

Verify that the feature settings for the vehicle speed sensor anti-tampering (Fault Code 242), application type and automatic transmission are set correctly. If any of these are set incorrectly for the specific vehicle and application, Fault Code 242 could occur erroneously.

Driving techniques such as driving for extended periods of time in lower gears can log Fault Code 242. Fault Code 242 can be logged if the driver attempts to defeat the road speed governor by repeatedly cycling the keyswitch.

Once the speed signal has been restored the fault code will go inactive once the keyswitch is on for 30 seconds and the ECM senses zero vehicle and engine speed.

Possible repairs:

1)Repair or replace the OEM harness.
2)Replace the ECM.

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.

This fault code goes active when the coolant level inside the radiator top tank or surge tank drops below the sensor level. Fill the top tank with coolant.

Possible repairs:

1)Add coolant to the engine.

Verify the 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, calibrate the ECM.

This fault code is logged when one of the following error conditions exists.

1)If the turbocharger actuator has just been replaced and this fault code is active, this usually indicates that the turbocharger actuator has not been installed correctly. The gear alignment between the actuator and the turbocharger housing is misaligned.
2)Foreign material in the VGT turbocharger can prevent the sliding nozzle from moving to the desired position at key-on.

The aftertreatment system must be inspected after making the appropriate repair outlined in this fault code troubleshooting tree. Progressive damage to the aftertreatment system may have occurred. Perform the aftertreatment initial check procedure to test for a damaged diesel particulate filter.

Possible repairs:

1)Inspect the grid heater for damage or plugging. If found damaged, replace the grid heater and inspect the air handling system for debris.
2)Replace the VGT actuator.
3)Replace the turbocharger.
4)Replace the damaged aftertreatment system component(s).
5)If necessary, calibrate the ECM.

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.

The fan control logic can be adjusted with INSITE™ electronic service tool. There are two choices: 12 or 24 volts ON, or 0 volts ON. For proper fan operation, the fan control logic setup with INSITE™ electronic service tool must match the hardware configuration on the vehicle.

This fault code is logged when the ECM commands 12 or 24 VDC to the fan control solenoid, but the voltage on the fan control signal circuit is less than 12 or 24 VDC. The low voltage on the signal circuit usually indicates a short circuit to ground in the harness or solenoid.

If Fault Code 245 is still active after completing the following troubleshooting steps, consult the OEM troubleshooting and repair manual for procedures to check the fan control circuit for a short circuit to ground.

Possible repairs:

1)Replace the fan control solenoid.
2)Repair or replace the OEM harness.
3)Replace the ECM.

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, calibrate the ECM.

The most common cause of this fault code is low boost pressure. Low boost pressure can be caused by several factors; leaking charge air cooler, damaged charge air cooler piping or hose, loose charge air cooler clamps, damaged intake manifold pressure sensor, damaged variable geometry turbocharger, damaged turbocharger control valve, or damaged turbocharger control shutoff valve.

This fault code can also be caused by a turbocharger fuel control derate which can be viewed in INSITE™ electronic service tool under the Engine Operating State. Turbocharger fuel control derates can be caused by several factors: high exhaust temperatures, high turbocharger compressor inlet temperatures, and high turbocharger compressor outlet temperatures.

Exhaust gas recirculation (EGR) system leaks can also cause this fault code. Inspect the EGR bellows and EGR connections for signs of leaks.

Note: This fault code will most likely not be active with no load in the shop. The engine must be loaded to trip this fault code and to determine if the malfunction has been found and fixed. Running units on the dynamometer can sometimes cause this fault code to log due to the stationary nature and high temperatures.

Possible repairs:

1)Repair the leaking sealing surface(s).
2)Repair or replace the leaking component.
3)Tighten any loose clamps.
4)Replace the turbocharger.
5)Repair any leaks in the EGR system.
6)If necessary, calibrate the ECM.

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.

The ambient air temperature sensor shares return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Check active fault codes with multiple counts first.

Possible causes:

1)Open return circuit in the harness, connectors, or sensor
2)Open signal circuit or shorted to voltage source.

Possible repairs:

1)Replace the ambient air temperature sensor.
2)Replace the ECM.
3)Repair or replace the engine harness.