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Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4156 PID: SPN: 5746 FMI: 4 Aftertreatment 1 Diesel Exhaust Fluid Dosing Unit Heater Relay Circuit- Voltage Below Normal or Shorted to Low Source
Circuit DescriptionThe aftertreatment diesel exhaust fluid dosing unit heater relay is used to provide power to the aftertreatment diesel exhaust fluid dosing unit heater.
The aftertreatment diesel exhaust fluid dosing unit heater is used to defrost and/or prevent freezing of the diesel exhaust fluid dosing unit.
Component LocationThe aftertreatment diesel exhaust fluid dosing unit heater relay is an OEM component. Refer to the OEM service manual for component location.
Conditions for Running the DiagnosticsThis diagnostic runs when the aftertreatment diesel exhaust fluid dosing unit heater is commanded OFF.
Conditions for Setting the Fault CodesThe Engine Control Module (ECM) detected the aftertreatment diesel exhaust fluid dosing unit heater relay signal was out of range low.
Action Taken When the Fault Code is ActiveThe ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.Diesel exhaust fluid injection into the aftertreatment system is disabled.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 CodeTo 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 TalkPossible causes of this fault code include:
A malfunctioning aftertreatment diesel exhaust fluid dosing unit heater relayA short circuit to ground in the OEM harnessAn open circuit in the OEM harness
Possible Cause:1) OEM harness2) ECM calibration
Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4155 PID: SPN: 5746 FMI: 3 Aftertreatment 1 Diesel Exhaust Fluid Dosing Unit Heater Relay Circuit- Voltage Above Normal or Shorted to High Source
Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4154 PID: SPN: 7323 FMI: 4 Aftertreatment 1 Particulate Sensor Heater Low Side Driver Circuit- Voltage Below Normal or Shorted to Low Source
Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4153 PID: SPN: 7321 FMI: 3 Aftertreatment 1 Particulate Sensor Heater High Side Driver Circuit- Voltage Above Normal or Shorted to High Source
Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4152 PID: SPN: 5743 FMI: 9 Aftertreatment Selective Catalytic Reduction Temperature Sensor Module- Abnormal Update Rate
Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4151 PID: SPN: 5742 FMI: 9 Aftertreatment Diesel Particulate Filter Temperature Sensor Module- Abnormal Update Rate
Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4149 PID: SPN: 2623 FMI: 8 Accelerator Pedal or Lever Position Sensor 2 Circuit Frequency- Abnormal frequency or Pulse width or Period