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 catalyst inlet temperature sensor shares return wires in the OEM harness with other sensors. A shorted return can cause multiple fault codes to be active.
Possible causes:
1)Open return circuit in the harness, connectors, or sensor 2)Open signal circuit or shorted to a voltage source.
Possible repairs:
1)Replace the aftertreatment diesel particulate filter inlet temperature sensor. 2)The removal and installation of the connector may correct the fault. 3)Replace the OEM harness, aftertreatment harness, and all interconnects. 4)Replace the ECM.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1674 PID: SPN: 3249 FMI: 4 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the aftertreatment diesel particulate filter inlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1667 PID: SPN: 3241 FMI: 2 Aftertreatment Exhaust Gas Temperature 1 – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel oxidation catalyst inlet temperature sensor is not changing with engine operating conditions.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1666 PID: SPN: 3241 FMI: 3 Aftertreatment Exhaust Gas Temperature 1 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the catalyst inlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1665 PID: SPN: 3241 FMI: 4 Aftertreatment Exhaust Gas Temperature 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the catalyst inlet sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1664 PID: SPN: 3050 FMI: 11 Catalyst Missing – Condition Exists. The aftertreatment catalyst in the exhaust system is not present.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1663 PID: SPN: 3241 FMI: 11 Catalyst Inlet Temperature Sensor Swapped with Outlet – Condition Exists. The inlet and outlet catalyst temperature sensor connections are swapped.
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.
Possible causes:
1)Stuck in-range aftertreatment diesel particulate filter inlet temperature sensor 2)High resistance in the aftertreatment diesel particulate filter inlet temperature sensor signal or return wires.
Possible repairs:
1)If no short is found, replace the temperature sensor that is reading higher or lower than the other sensors. 2)Replace the aftertreatment diesel particulate filter inlet temperature sensor. 3)Replace the OEM harness. 4)Replace the aftertreatment harness. 5)Replace all interconnects.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1675 PID: SPN: 3249 FMI: 3 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the aftertreatment diesel particulate filter inlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1674 PID: SPN: 3249 FMI: 4 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the aftertreatment diesel particulate filter inlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1667 PID: SPN: 3241 FMI: 2 Aftertreatment Exhaust Gas Temperature 1 – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel oxidation catalyst inlet temperature sensor is not changing with engine operating conditions.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1666 PID: SPN: 3241 FMI: 3 Aftertreatment Exhaust Gas Temperature 1 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the catalyst inlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1665 PID: SPN: 3241 FMI: 4 Aftertreatment Exhaust Gas Temperature 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the catalyst inlet sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1664 PID: SPN: 3050 FMI: 11 Catalyst Missing – Condition Exists. The aftertreatment catalyst in the exhaust system is not present.
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.
This fault code is logged when the conversion efficiency of the DOC is calculated to be less than that required to perform an effective regeneration.
Possible causes:
1)Soot plugging the front face of the aftertreatment diesel oxidation catalyst 2)Engine oil or fuel contamination of the aftertreatment diesel oxidation catalyst 3)A cracked or contaminated aftertreatment diesel oxidation catalyst 4)A leaking exhaust system between the turbocharger and the diesel oxidation catalyst. 5)Excessive automatic/stationary regenerations causing soot plugging on the front face of the aftertreatment diesel oxidation catalyst.
An in-range malfunction of the aftertreatment diesel oxidation catalyst temperature sensor or the aftertreatment diesel particulate filter inlet temperature sensor can cause this fault code. Make sure there are not any fault codes related to the aftertreatment temperature sensors before following this troubleshooting tree.
Possible repairs:
1)If necessary, calibrate the ECM. 2)Repair or replace the damaged or leaking exhaust system components. 3)Replace the aftertreatment DOC.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1676 PID: SPN: 3249 FMI: 2 Aftertreatment Exhaust Gas Temperature 2 – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel particulate filter inlet temperature sensor is not changing with engine operating conditions.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1675 PID: SPN: 3249 FMI: 3 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the aftertreatment diesel particulate filter inlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1674 PID: SPN: 3249 FMI: 4 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the aftertreatment diesel particulate filter inlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1667 PID: SPN: 3241 FMI: 2 Aftertreatment Exhaust Gas Temperature 1 – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel oxidation catalyst inlet temperature sensor is not changing with engine operating conditions.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1666 PID: SPN: 3241 FMI: 3 Aftertreatment Exhaust Gas Temperature 1 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the catalyst inlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1665 PID: SPN: 3241 FMI: 4 Aftertreatment Exhaust Gas Temperature 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the catalyst inlet sensor circuit
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 circuit to a power supply, a damaged sensor, or a damaged ECM power supply.
Possible repairs:
1)Repair or replace the OEM harness. 2)Replace the ECM.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1691 PID: SPN: 3250 FMI: 13 Catalyst Efficiency – Out of Calibration. The temperature increase across the aftertreatment diesel oxidation catalyst is lower than expected.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1676 PID: SPN: 3249 FMI: 2 Aftertreatment Exhaust Gas Temperature 2 – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel particulate filter inlet temperature sensor is not changing with engine operating conditions.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1675 PID: SPN: 3249 FMI: 3 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the aftertreatment diesel particulate filter inlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1674 PID: SPN: 3249 FMI: 4 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the aftertreatment diesel particulate filter inlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1667 PID: SPN: 3241 FMI: 2 Aftertreatment Exhaust Gas Temperature 1 – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel oxidation catalyst inlet temperature sensor is not changing with engine operating conditions.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1666 PID: SPN: 3241 FMI: 3 Aftertreatment Exhaust Gas Temperature 1 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the catalyst inlet temperature sensor circuit.
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.
Low voltage on the 5-volt supply wire can be caused by a short circuit to ground in a supply wire, a short circuit between a supply wire and a return wire, a failed sensor, or a failed ECM power supply.
Possible repairs:
1)Replace the accelerator/lever position sensor. 2)Replace the aftertreatment diesel particulate filter differential pressure sensor. 3)Replace the coolant level sensor. 4)Replace the remote throttle. 5)Replace the fan speed sensor. 6)Replace the engine harness. 8)Repair or replace the OEM harness.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1695 PID: SID 232 SPN: 3513 FMI: 3 Sensor Supply 5 – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 5 circuit in the OEM harness.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1691 PID: SPN: 3250 FMI: 13 Catalyst Efficiency – Out of Calibration. The temperature increase across the aftertreatment diesel oxidation catalyst is lower than expected.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1676 PID: SPN: 3249 FMI: 2 Aftertreatment Exhaust Gas Temperature 2 – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel particulate filter inlet temperature sensor is not changing with engine operating conditions.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1675 PID: SPN: 3249 FMI: 3 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the aftertreatment diesel particulate filter inlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1674 PID: SPN: 3249 FMI: 4 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the aftertreatment diesel particulate filter inlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1667 PID: SPN: 3241 FMI: 2 Aftertreatment Exhaust Gas Temperature 1 – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel oxidation catalyst inlet temperature sensor is not changing with engine operating conditions.
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 crankcase pressure sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Before troubleshooting, check for multiple fault codes.
Possible causes:
1)Open return circuit in the engine harness, connectors, or sensor 2)Signal wire shorted to sensor supply or battery voltage.
Possible repairs:
1)Replace the crankcase pressure sensor. 2)The removal and installation of the connector may correct the problem. 3)Repair or replace the engine harness. 4)Replace the ECM.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1696 PID: SID 232 SPN: 3513 FMI: 4 Sensor Supply 5 – Voltage Below Normal or Shorted to Low Source. Low voltage detected at sensor supply number 5 circuit in the OEM harness.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1695 PID: SID 232 SPN: 3513 FMI: 3 Sensor Supply 5 – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 5 circuit in the OEM harness.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1691 PID: SPN: 3250 FMI: 13 Catalyst Efficiency – Out of Calibration. The temperature increase across the aftertreatment diesel oxidation catalyst is lower than expected.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1676 PID: SPN: 3249 FMI: 2 Aftertreatment Exhaust Gas Temperature 2 – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel particulate filter inlet temperature sensor is not changing with engine operating conditions.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1675 PID: SPN: 3249 FMI: 3 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the aftertreatment diesel particulate filter inlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1674 PID: SPN: 3249 FMI: 4 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the aftertreatment diesel particulate filter inlet temperature sensor circuit.
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 crankcase pressure sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Before troubleshooting, check for multiple fault codes.
Possible causes:
1)Signal circuit open or shorted to ground in the engine harness or sensor 2)Supply wire open or shorted to ground.
Possible repairs:
1)Replace the crankcase pressure sensor. 2)Repair or replace the engine harness. 3)Replace the ECM.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1843 PID: 101 SPN: 101 FMI: 3 Crankcase Pressure Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the crankcase pressure circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1696 PID: SID 232 SPN: 3513 FMI: 4 Sensor Supply 5 – Voltage Below Normal or Shorted to Low Source. Low voltage detected at sensor supply number 5 circuit in the OEM harness.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1695 PID: SID 232 SPN: 3513 FMI: 3 Sensor Supply 5 – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 5 circuit in the OEM harness.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1691 PID: SPN: 3250 FMI: 13 Catalyst Efficiency – Out of Calibration. The temperature increase across the aftertreatment diesel oxidation catalyst is lower than expected.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1676 PID: SPN: 3249 FMI: 2 Aftertreatment Exhaust Gas Temperature 2 – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel particulate filter inlet temperature sensor is not changing with engine operating conditions.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1675 PID: SPN: 3249 FMI: 3 Aftertreatment Exhaust Gas Temperature 2 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the aftertreatment diesel particulate filter inlet temperature sensor circuit.
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 check is only performed at keyswitch OFF, during the ECM powerdown. During this diagnostic check, the ECM monitors the value of the EGR differential pressure sensor. If this value is outside of a specified range, Fault Code 1866 is set active.
Possible causes:
1)A damaged EGR differential pressure sensor 2)High resistance in the wiring harness on the signal or return wire 3)Plugged or restricted EGR differential pressure sensor flow ports.
Possible repairs:
1)Clean the EGR differential pressure sensor flow ports. 2)Replace the EGR differential pressure sensor. 3)Replace the ECM. 4)Replace the engine harness.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1844 PID: 101 SPN: 101 FMI: 4 Crankcase Pressure Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the crankcase pressure circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1843 PID: 101 SPN: 101 FMI: 3 Crankcase Pressure Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the crankcase pressure circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1696 PID: SID 232 SPN: 3513 FMI: 4 Sensor Supply 5 – Voltage Below Normal or Shorted to Low Source. Low voltage detected at sensor supply number 5 circuit in the OEM harness.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1695 PID: SID 232 SPN: 3513 FMI: 3 Sensor Supply 5 – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 5 circuit in the OEM harness.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1691 PID: SPN: 3250 FMI: 13 Catalyst Efficiency – Out of Calibration. The temperature increase across the aftertreatment diesel oxidation catalyst is lower than expected.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1676 PID: SPN: 3249 FMI: 2 Aftertreatment Exhaust Gas Temperature 2 – Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel particulate filter inlet temperature sensor is not changing with engine operating conditions.
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 aftertreatment diesel particulate filter outlet temperature sensor shares return wires in the OEM harness with other sensors. A shorted return can cause multiple fault codes to be active.
Possible causes:
1)Open return circuit in the harness, connectors or sensor 2)Open signal circuit or shorted to a voltage source.
Possible repairs:
1)Replace the aftertreatment diesel particulate filter outlet temperature sensor. 2)The removal and installation of the connector may correct the fault. 3)Replace the OEM harness. 4)Replace the aftertreatment harness. 5)Replace all interconnects. 6)Replace the ECM.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1866 PID: 411 SPN: 411 FMI: 2 Exhaust Gas Recirculation Valve Delta Pressure – Data Erratic, Intermittent, or Incorrect. An error in the EGR delta pressure signal was detected at initial key-on or the sensor failed the autozero test.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1844 PID: 101 SPN: 101 FMI: 4 Crankcase Pressure Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the crankcase pressure circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1843 PID: 101 SPN: 101 FMI: 3 Crankcase Pressure Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the crankcase pressure circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1696 PID: SID 232 SPN: 3513 FMI: 4 Sensor Supply 5 – Voltage Below Normal or Shorted to Low Source. Low voltage detected at sensor supply number 5 circuit in the OEM harness.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1695 PID: SID 232 SPN: 3513 FMI: 3 Sensor Supply 5 – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 5 circuit in the OEM harness.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1691 PID: SPN: 3250 FMI: 13 Catalyst Efficiency – Out of Calibration. The temperature increase across the aftertreatment diesel oxidation catalyst is lower than expected.
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 aftertreatment diesel particulate filter outlet temperature sensor shares return wires in the OEM harness with other sensors. A shorted return can cause multiple fault codes to be active.
Possible causes:
1)Signal shorted to ground in the harness 2)Signal shorted to return or ground in the sensor.
Possible repairs:
1)Replace the aftertreatment diesel particulate filter outlet temperature sensor. 2)Replace the OEM harness. 3)Replace the aftertreatment harness. 4)Replace all interconnects. 5)Replace the ECM.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1876 PID: SPN: 3245 FMI: 3 Aftertreatment Exhaust Gas Temperature 3 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage or open circuit detected at the aftertreatment diesel particulate filter outlet temperature sensor circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1866 PID: 411 SPN: 411 FMI: 2 Exhaust Gas Recirculation Valve Delta Pressure – Data Erratic, Intermittent, or Incorrect. An error in the EGR delta pressure signal was detected at initial key-on or the sensor failed the autozero test.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1844 PID: 101 SPN: 101 FMI: 4 Crankcase Pressure Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the crankcase pressure circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1843 PID: 101 SPN: 101 FMI: 3 Crankcase Pressure Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the crankcase pressure circuit.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1696 PID: SID 232 SPN: 3513 FMI: 4 Sensor Supply 5 – Voltage Below Normal or Shorted to Low Source. Low voltage detected at sensor supply number 5 circuit in the OEM harness.
PACCAR PX-6 CM2150 (2007-09) Fault Code: 1695 PID: SID 232 SPN: 3513 FMI: 3 Sensor Supply 5 – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 5 circuit in the OEM harness.
