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PACCAR PX-9 CM2350 (2013-17) Fault Code:1621 PID:137 SPN:1387 FMI:4 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Below Normal or Shorted to Low Source

Reason:
Auxiliary Pressure Sensor Input 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected on the original equipment manufacturer (OEM) pressure sensor circuit.

Effect:
None on performance

Circuit Description:
The original equipment manufacturer (OEM) has the option of wiring a pressure or temperature sensor input to the Cummins® engine control module (ECM). A specific calibration is then created to recognize this pressure or temperature sensor input. This fault code is activated when the pressure or temperature input from the OEM sensor exceeds the engine protection limit defined by the OEM. Depending on OEM requirements, an Engine Protection derate can be associated with this fault code.

Component Location:
The OEM pressure sensor input and location will vary. Refer to the OEM service manual for sensor location.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected low voltage on the control signal circuit

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:
1) To validate the repair, start the engine and let it idle for 1 minute.
2) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
3) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults.

Shop Talk:
N/A

Possible Causes:
1) Signal circuit open or shorted to ground in the engine harness or sensor
2) Supply line open or shorted to ground

PACCAR PX-9 CM2350 (2013-17) Fault Code:155 PID:105 SPN:105 FMI:0 Intake Manifold 1 Temperature – Data Valid But Above Normal Operating Range – Most Severe Level
PACCAR PX-9 CM2350 (2013-17) Fault Code:154 PID105 SPN:105 FMI:4 Intake Manifold 1 Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1539 PID:137 SPN:137 FMI3 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Above Normal or Shorted to High Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:153 PID:105 SPN:105 FMI:3 Intake Manifold 1 Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1515 PID:91 SPN:91 FMI:2 SAE J1939 Multiplexed Accelerator Pedal or Lever Sensor System – Received Network Data in Error
PACCAR PX-9 CM2350 (2013-17) Fault Code:1515 PID:91 SPN:91 FMI:19 SAE J1939 Multiplexed Accelerator Pedal or Lever Sensor System – Received Network Data in Error

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PACCAR PX-9 CM2350 (2013-17) Fault Code:1664 PID:SID 380 SPN:4796 FMI:11 Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists

Reason:
Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists. The aftertreatment diesel oxidation catalyst is not present in the exhaust system.

Effect:
Possible reduced engine performance.

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 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 during active regeneration of the aftertreatment diesel particulate filter

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the difference between the aftertreatment diesel oxidation catalyst intake temperature sensor signal and the aftertreatment diesel particulate filter intake temperature sensor signal during an active regeneration of the aftertreatment system was too small indicating a missing diesel oxidation catalyst.

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) Active and stationary regeneration of the diesel particulate filter will be disabled.
3) 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, start the engine and perform the INSITE™ electronic service tool Aftertreatment Diesel Particulate Filter Regeneration Test.
2) The fault code status displayed by INSITE™ electronic service 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 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 becomes active when the aftertreatment diesel oxidation catalyst intake and aftertreatment diesel particulate filter intake temperature sensors do not detect the presence of a catalyst in the aftertreatment system.

Possible Causes:
1) Tampering with the catalyst system
2) Removing the catalyst system from the vehicle
3) A damaged catalyst

PACCAR PX-9 CM2350 (2013-17) Fault Code:1664 PID:SID 380 SPN:4796 FMI:31 Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists
PACCAR PX-9 CM2350 (2013-17) Fault Code:1621 PID:137 SPN:1387 FMI:4 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:155 PID:105 SPN:105 FMI:0 Intake Manifold 1 Temperature – Data Valid But Above Normal Operating Range – Most Severe Level
PACCAR PX-9 CM2350 (2013-17) Fault Code:154 PID105 SPN:105 FMI:4 Intake Manifold 1 Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1539 PID:137 SPN:137 FMI3 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Above Normal or Shorted to High Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:153 PID:105 SPN:105 FMI:3 Intake Manifold 1 Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source

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PACCAR PX-9 CM2350 (2013-17) Fault Code:1664 PID:SID 380 SPN:4796 FMI:31 Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists

Reason:
Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists. The aftertreatment diesel oxidation catalyst is not present in the exhaust system.

Effect:
Possible reduced engine performance.

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 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 during active regeneration of the aftertreatment diesel particulate filter

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the difference between the aftertreatment diesel oxidation catalyst intake temperature sensor signal and the aftertreatment diesel particulate filter intake temperature sensor signal during an active regeneration of the aftertreatment system was too small indicating a missing diesel oxidation catalyst.

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) Active and stationary regeneration of the diesel particulate filter will be disabled.
3) 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, start the engine and perform the INSITE™ electronic service tool Aftertreatment Diesel Particulate Filter Regeneration Test.
2) The fault code status displayed by INSITE™ electronic service 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 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 becomes active when the aftertreatment diesel oxidation catalyst intake and aftertreatment diesel particulate filter intake temperature sensors do not detect the presence of a catalyst in the aftertreatment system.

Possible Causes:
1) Tampering with the catalyst system
2) Removing the catalyst system from the vehicle
3) A damaged catalyst

PACCAR PX-9 CM2350 (2013-17) Fault Code:1621 PID:137 SPN:1387 FMI:4 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:155 PID:105 SPN:105 FMI:0 Intake Manifold 1 Temperature – Data Valid But Above Normal Operating Range – Most Severe Level
PACCAR PX-9 CM2350 (2013-17) Fault Code:154 PID105 SPN:105 FMI:4 Intake Manifold 1 Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1539 PID:137 SPN:137 FMI3 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Above Normal or Shorted to High Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:153 PID:105 SPN:105 FMI:3 Intake Manifold 1 Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1515 PID:91 SPN:91 FMI:2 SAE J1939 Multiplexed Accelerator Pedal or Lever Sensor System – Received Network Data in Error

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PACCAR PX-9 CM2350 (2013-17) Fault Code:1668-2 PID:203C SPN:1761 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source

Reason:
Aftertreatment Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the aftertreatment diesel exhaust fluid tank level sensor circuit.

Effect:
Possible reduced engine performance

Circuit Description:
The aftertreatment diesel exhaust fluid quality sensor is a smart device that communicates to the ECM via the J1939 datalink. The aftertreatment diesel exhaust fluid quality sensor performs its own internal diagnostics and reports malfunctions back to the primary engine contol module via the J1939 datalink. The aftertreatment diesel exhaust fluid quality sensor is used to measure the concentration of the aftertreatment diesel exhaust fluid in the tank.

Component Location:
The aftertreatment diesel exhaust fluid tank level sensor is located in the aftertreatment diesel exhaust fluid tank. Location of the tank and level sensor is OEM dependent. Refer to the OEM service manual.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the aftertreatment diesel exhaust fluid tank level sensor signal voltage was out of range low.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
2) 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, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service 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) 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:
The type of diesel exhaust fluid tank temperature and level sensor used can vary depending on the vehicle OEM. As a result, the physical and/or electrical sensor configuration may vary slightly from what is shown in the troubleshooting and wiring diagram information. 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 Causes:
1) Signal circuit open or shorted to ground in the engine harness or sensor
2) Supply line open or shorted to ground

PACCAR PX-9 CM2350 (2013-17) Fault Code:1664 PID:SID 380 SPN:4796 FMI:11 Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists
PACCAR PX-9 CM2350 (2013-17) Fault Code:1664 PID:SID 380 SPN:4796 FMI:31 Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists
PACCAR PX-9 CM2350 (2013-17) Fault Code:1621 PID:137 SPN:1387 FMI:4 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:155 PID:105 SPN:105 FMI:0 Intake Manifold 1 Temperature – Data Valid But Above Normal Operating Range – Most Severe Level
PACCAR PX-9 CM2350 (2013-17) Fault Code:154 PID105 SPN:105 FMI:4 Intake Manifold 1 Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1539 PID:137 SPN:137 FMI3 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Above Normal or Shorted to High Source

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PACCAR PX-9 CM2350 (2013-17) Fault Code:1668-3 PID:203C SPN:1761 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source

Reason:
Aftertreatment Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the aftertreatment diesel exhaust fluid tank level sensor circuit.

Effect:
Possible reduced engine performance

Circuit Description:
The aftertreatment diesel exhaust fluid quality sensor is a smart device that communicates to the ECM via the J1939 datalink. The aftertreatment diesel exhaust fluid quality sensor performs its own internal diagnostics and reports malfunctions back to the primary engine contol module via the J1939 datalink. The aftertreatment diesel exhaust fluid quality sensor is used to measure the concentration of the aftertreatment diesel exhaust fluid in the tank.

Component Location:
The aftertreatment diesel exhaust fluid tank level sensor is located in the aftertreatment diesel exhaust fluid tank. Location of the tank and level sensor is OEM dependent. Refer to the OEM service manual.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the aftertreatment diesel exhaust fluid tank level sensor signal voltage was out of range low.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
2) 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, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service 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) 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:
The type of diesel exhaust fluid tank temperature and level sensor used can vary depending on the vehicle OEM. As a result, the physical and/or electrical sensor configuration may vary slightly from what is shown in the troubleshooting and wiring diagram information.

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 Causes:
1) Signal circuit open or shorted to ground in the engine harness or sensor
2) Supply line open or shorted to ground

PACCAR PX-9 CM2350 (2013-17) Fault Code:1668-2 PID:203C SPN:1761 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1664 PID:SID 380 SPN:4796 FMI:11 Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists
PACCAR PX-9 CM2350 (2013-17) Fault Code:1664 PID:SID 380 SPN:4796 FMI:31 Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists
PACCAR PX-9 CM2350 (2013-17) Fault Code:1621 PID:137 SPN:1387 FMI:4 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:155 PID:105 SPN:105 FMI:0 Intake Manifold 1 Temperature – Data Valid But Above Normal Operating Range – Most Severe Level
PACCAR PX-9 CM2350 (2013-17) Fault Code:154 PID105 SPN:105 FMI:4 Intake Manifold 1 Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source

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PACCAR PX-9 CM2350 (2013-17) Fault Code:1669-2 PID:203D SPN:1761 FMI:3 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source

Reason:
Aftertreatment Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the catalyst tank level sensor circuit.

Effect:
Possible reduced engine performance

Circuit Description:
The aftertreatment diesel exhaust fluid quality sensor is a smart device that communicates to the ECM via the J1939 datalink. The aftertreatment diesel exhaust fluid quality sensor performs its own internal diagnostics and reports malfunctions back to the primary engine contol module via the J1939 datalink. The aftertreatment diesel exhaust fluid quality sensor is used to measure the concentration of the aftertreatment diesel exhaust fluid in the tank.

Component Location:
The aftertreatment diesel exhaust fluid tank level sensor is located in the aftertreatment diesel exhaust fluid tank. Location of the tank and level sensor is OEM dependent. Refer to the OEM service manual.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the aftertreatment diesel exhaust fluid tank level sensor signal voltage was out of range high.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
2) Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
3) Engine torque will be severely reduced.

Vehicle speed will be limited to 8 km [5 mi] per hour after extended engine operation with the fault code active.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service 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) 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:
The type of diesel exhaust fluid tank temperature and level sensor used can vary depending on the vehicle OEM. As a result, the physical and/or electrical sensor configuration may vary slightly from what is shown in the troubleshooting and wiring diagram information.

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 Causes:
1) Open return circuit in the harness, connectors, or sensor
2) Signal circuit shorted to sensor supply or battery voltage

PACCAR PX-9 CM2350 (2013-17) Fault Code:1668-3 PID:203C SPN:1761 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1668-2 PID:203C SPN:1761 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1664 PID:SID 380 SPN:4796 FMI:11 Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists
PACCAR PX-9 CM2350 (2013-17) Fault Code:1664 PID:SID 380 SPN:4796 FMI:31 Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists
PACCAR PX-9 CM2350 (2013-17) Fault Code:1621 PID:137 SPN:1387 FMI:4 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:155 PID:105 SPN:105 FMI:0 Intake Manifold 1 Temperature – Data Valid But Above Normal Operating Range – Most Severe Level

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PACCAR PX-9 CM2350 (2013-17) Fault Code:1669-3 PID:203D SPN:1761 FMI:3 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source

Reason:
Aftertreatment Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the catalyst tank level sensor circuit.

Effect:
Possible reduced engine performance

Circuit Description:
The aftertreatment diesel exhaust fluid quality sensor is a smart device that communicates to the ECM via the J1939 datalink. The aftertreatment diesel exhaust fluid quality sensor performs its own internal diagnostics and reports malfunctions back to the primary engine contol module via the J1939 datalink. The aftertreatment diesel exhaust fluid quality sensor is used to measure the concentration of the aftertreatment diesel exhaust fluid in the tank.

Component Location:
The aftertreatment diesel exhaust fluid tank level sensor is located in the aftertreatment diesel exhaust fluid tank. Location of the tank and level sensor is OEM dependent. Refer to the OEM service manual.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the aftertreatment diesel exhaust fluid tank level sensor signal voltage was out of range high.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
2) Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
3) Engine torque will be severely reduced.

Vehicle speed will be limited to 8 km [5 mi] per hour after extended engine operation with the fault code active.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service 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) 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:
The type of diesel exhaust fluid tank temperature and level sensor used can vary depending on the vehicle OEM. As a result, the physical and/or electrical sensor configuration may vary slightly from what is shown in the troubleshooting and wiring diagram information.

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 Causes:
1) Open return circuit in the harness, connectors, or sensor
2) Signal circuit shorted to sensor supply or battery voltage

PACCAR PX-9 CM2350 (2013-17) Fault Code:1669-2 PID:203D SPN:1761 FMI:3 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1668-3 PID:203C SPN:1761 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1668-2 PID:203C SPN:1761 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1664 PID:SID 380 SPN:4796 FMI:11 Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists
PACCAR PX-9 CM2350 (2013-17) Fault Code:1664 PID:SID 380 SPN:4796 FMI:31 Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists
PACCAR PX-9 CM2350 (2013-17) Fault Code:1621 PID:137 SPN:1387 FMI:4 Auxiliary Pressure Sensor Input 1 Circuit – Voltage Below Normal or Shorted to Low Source

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PACCAR PX-9 CM2350 (2013-17) Fault Code:1677 PID: SPN:3031 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature Sensor – Voltage Below Normal or Shorted to Low Source

Reason:
Aftertreatment Diesel Exhaust Fluid Tank Temperature Sensor – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the diesel exhaust fluid tank temperature sensor circuit.

Effect:
Possible reduced engine performance

Circuit Description:
The aftertreatment diesel exhaust fluid tank temperature sensor is used to monitor the temperature of the aftertreatment diesel exhaust fluid inside the aftertreatment diesel exhaust fluid tank.

Component Location:
The aftertreatment diesel exhaust fluid tank temperature sensor is located in the diesel exhaust fluid tank. Location of the tank and temperature sensor is OEM dependent. Refer to the OEM service manual.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the aftertreatment diesel exhaust fluid tank temperature signal voltage was out of range low.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
2) 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, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service 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 INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
The type of diesel exhaust fluid tank temperature and level sensor used can vary depending on the vehicle OEM. As a result, the physical and/or electrical sensor configuration may vary slightly from what is shown in the troubleshooting and wiring diagram information.

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 Causes:
1) A malfunctioning aftertreatment diesel exhaust fluid tank temperature sensor
2) Signal shorted to ground in the harness
3) Signal shorted to return or ground in the sensor

PACCAR PX-9 CM2350 (2013-17) Fault Code1673 PID: SPN:1761 FMI:1 Aftertreatment 1 Diesel Exhaust Fluid Tank Level – Data Valid But Below Normal Operating Range – Most Severe Level
PACCAR PX-9 CM2350 (2013-17) Fault Code:1669-3 PID:203D SPN:1761 FMI:3 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1669-2 PID:203D SPN:1761 FMI:3 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1668-3 PID:203C SPN:1761 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1668-2 PID:203C SPN:1761 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1664 PID:SID 380 SPN:4796 FMI:11 Aftertreatment Diesel Oxidation Catalyst Missing – Condition Exists

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PACCAR PX-9 CM2350 (2013-17) Fault Code:1678 PID: SPN:3031 FMI:3 Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature Sensor – Voltage Above Normal or Shorted to High Source

Reason:
Aftertreatment Diesel Exhaust Fluid Tank Temperature Sensor – Voltage Above Normal or Shorted to High Source. High signal voltage or open circuit detected at the diesel exhaust fluid tank temperature sensor circuit.

Effect:
Possible reduced engine performance

Circuit Description:
The aftertreatment diesel exhaust fluid tank temperature sensor is used to monitor the temperature of the aftertreatment diesel exhaust fluid inside the aftertreatment diesel exhaust fluid tank.

Component Location:
The aftertreatment diesel exhaust fluid tank temperature sensor is located in the diesel exhaust fluid tank. Location of the tank and temperature sensor is OEM dependent. Refer to the OEM service manual.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the aftertreatment diesel exhaust fluid tank temperature signal voltage was out of range high.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
2) Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
3) Engine torque will be severely reduced.

Vehicle speed will be limited to 8 km [5 mi] per hour after extended engine operation with the fault code active.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service 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 INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
The type of diesel exhaust fluid tank temperature and level sensor used can vary depending on the vehicle OEM. As a result, the physical and/or electrical sensor configuration may vary slightly from what is shown in the troubleshooting and wiring diagram information.

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 Causes:
1) A malfunctioning aftertreatment diesel exhaust fluid tank temperature sensor
2) Open return circuit in the harness, connectors, or sensor
3) Open signal circuit or shorted to a voltage source

PACCAR PX-9 CM2350 (2013-17) Fault Code:1677 PID: SPN:3031 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature Sensor – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code1673 PID: SPN:1761 FMI:1 Aftertreatment 1 Diesel Exhaust Fluid Tank Level – Data Valid But Below Normal Operating Range – Most Severe Level
PACCAR PX-9 CM2350 (2013-17) Fault Code:1669-3 PID:203D SPN:1761 FMI:3 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1669-2 PID:203D SPN:1761 FMI:3 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1668-3 PID:203C SPN:1761 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1668-2 PID:203C SPN:1761 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source

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PACCAR PX-9 CM2350 (2013-17) Fault Code:1678 PID: SPN:3362 FMI:11 Aftertreatment Diesel Exhaust Fluid Dosing Unit Input Lines – Condition Exists

Reason:
Aftertreatment Diesel Exhaust Fluid Dosing Unit Input Lines – Condition Exists. The aftertreatment diesel exhaust fluid dosing unit is unable to prime.

Effect:
Possible reduced engine performance

Circuit Description:
The diesel exhaust fluid dosing unit lines are responsible for transporting diesel exhaust fluid between the dosing unit, dosing valve, and diesel exhaust fluid tank.

Component Location:
There are three diesel exhaust fluid lines. One line is between the dosing unit and dosing valve, and the other two lines are between the dosing unit and the diesel exhaust fluid tank. These lines can be partially hidden from view by the SCR system and other vehicle components. Line routing will vary, based on the aftertreatment architecture and the OEM.

Conditions for Running the Diagnostics:
This diagnostic runs when the SCR system is trying to prime.

Conditions for Setting the Fault Codes:
The aftertreatment diesel exhaust fluid dosing unit was unable to successfully prime after multiple attempts.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
2) Engine torque will be severely reduced.

Vehicle speed will be limited to 8 km [5 mi] per hour after extended engine operation with the fault code active.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform the “Aftertreatment Diesel Exhaust Fluid System Leak Test” found under “ECM Diagnostic Tests” in the INSITE™ electronic service tool
2) The fault code status displayed by INSITE™ electronic service 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 INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
N/A

Possible Causes:
1) Low aftertreatment diesel exhaust fluid level in the diesel exhaust fluid tank
2) The line heaters are not successfully thawing the frozen diesel exhaust fluid
3) The diesel exhaust fluid pressure line between the dosing unit and dosing valve is kinked, broken, or disconnected
4) The diesel exhaust fluid suction line between the diesel exhaust fluid tank and the dosing unit is kinked, broken, or disconnected
5) Malfunctioning diesel exhaust fluid dosing unit
6) The diesel exhaust fluid suction and return lines between the dosing unit and diesel exhaust fluid tank are reversed
7) Debris from the diesel exhaust fluid tank. If debris is found in the diesel exhaust fluid tank, clean the diesel exhaust fluid tank thoroughly and fill with certified diesel exhaust fluid.

PACCAR PX-9 CM2350 (2013-17) Fault Code:1678 PID: SPN:3031 FMI:3 Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature Sensor – Voltage Above Normal or Shorted to High Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1677 PID: SPN:3031 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature Sensor – Voltage Below Normal or Shorted to Low Source
PACCAR PX-9 CM2350 (2013-17) Fault Code1673 PID: SPN:1761 FMI:1 Aftertreatment 1 Diesel Exhaust Fluid Tank Level – Data Valid But Below Normal Operating Range – Most Severe Level
PACCAR PX-9 CM2350 (2013-17) Fault Code:1669-3 PID:203D SPN:1761 FMI:3 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1669-2 PID:203D SPN:1761 FMI:3 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source
PACCAR PX-9 CM2350 (2013-17) Fault Code:1668-3 PID:203C SPN:1761 FMI:4 Aftertreatment 1 Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source

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