I'm getting a sid 324 fmi 2, sid 324 fmi 0, sid 328 fmi 2,

Thank you. All these codes are for the DPF and after treatment system. You Derated due the DPF being excessively plugged. With the 1922 fault the DPF and DOC must be removed from the unit and inspected for damage and serviceability. You may have an upstream failure such as injectors, pistons,valve seals or a failing turbo causing the DPF to plug up. Please don't forget to rate my service

Fault Code: 1883
PID: S324
SPN: 3251
FMI: 2/2
Aftertreatment Particulate Filter Differential Pressure Sensor - Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel particulate filter differential pressure sensor is reading an erratic value at initial key-on or during engine operation.Active aftertreatment diesel particulate filter regeneration will be disabled.

Possible causes of this fault code include:

• Stuck in-range aftertreatment diesel particulate filter differential pressure sensor reading

• High resistance in the aftertreatment diesel particulate filter differential pressure sensor signal or return wires

• Plugged aftertreatment differential pressure sensor tubes could cause this fault code if pressure is held in the tube after the engine is turned off.

Fault Code: 1922
PID: S324
SPN: 3251
FMI: 0/0

Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid but Above Normal Operational Range - Most Severe Level. The soot load of the aftertreatment diesel particulate filter has exceeded the recommended limits.

Severe engine derate.

Possible causes of this fault code include:

• The engine has been operating in a light load condition that prevents exhaust temperatures from being high enough to actively regenerate the aftertreatment diesel particulate filter.

• Possible base engine damage that causes excessive black soot to be generated.
• The DPF and DOC MUST be removed and inspected and cleaned with this fault code.

Fault Code: 1877
PID: S328
SPN: 3245
FMI: 4/4

Aftertreatment Exhaust Gas Temperature 3 Circuit - Voltage Below Normal, or Shorted to Low Source. Low signal voltage detected at the aftertreatment diesel particulate filter outlet temperature sensor circuit.Active aftertreatment diesel particulate filter regeneration will be disabled.

Possible causes of this fault code include:

Signal shorted to ground in the harness.

Signal shorted to return or ground in the sensor

Plugged DPF

ECM calibration is out of date

Failed sensor

Fault Code: 1878
PID: S328
SPN: 3245
FMI: 2/2
Aftertreatment Exhaust Gas Temperature 3 - Data Erratic, Intermittent, or Incorrect. The aftertreatment diesel particulate filter outlet temperature sensor is not changing with engine operating conditions.Active aftertreatment diesel particulate filter regeneration will be disabled.

Possible causes of this fault code include:

• Stuck in-range aftertreatment diesel particulate filter outlet temperature sensor
• High resistance in the aftertreatment diesel particulate filter outlet temperature sensor signal or return wires
• Failed sensor
• Ecm calibration is out of date
• Plugged DPF