P244B
DTC P244B Diesel Particulate Filter Differential Pressure Too HighDescription
The ECM detects the condition of PM accumulations from the exhaust differential pressure sensor attached to the chassis frame near the diesel particulate filter (DPF) assembly. When it is reached to a certain amount of PM accumulations or a certain length of mileage the automatic regeneration starts. If the automatic regeneration cannot be completed by some reason the emergency regeneration is requested to the driver by illuminating the DPF lamp on the instrument panel cluster. If the ECM detects that the exhaust differential pressure is more than a predetermined range of the calculated value this DTC will set.
Condition for Running the DTC
^ DTCs P0079 P0080 P0102 P0103 P02E8 P02E9 P0405 P0406 P0652 P0653 P2032 P2033 P2454 and P2455 are not set.
^ The battery voltage is between 10 to 16 volts.
^ The ignition switch is ON.
Condition for Setting the DTC
^ The exhaust differential pressure is more than a predetermined range of the calculated differential pressure value.
Action Taken When the DTC Sets
^ The ECM illuminates the MIL when the diagnostic runs and fails. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type A.
^ The ECM limits fuel injection quantity.
^ The ECM inhibits EGR control.
^ The ECM inhibits cruise control.
Condition for Clearing the DTC
^ Refer to DTC Type Definitions for Condition for Clearing the MIL/DTC - Type A.
Diagnostic Aids
^ Misrouted disconnected or plugged exhaust differential pressure hoses or pipes may set this DTC.
^ If emergency regeneration is frequently requested refer to DPF System Emergency Regeneration Frequently chart in symptom diagnostic table.
Notice: This DTC is caused by incomplete automatic regeneration has occurred and emergency regeneration urged by the DPF lamp was disregarded or forgot, which was most likely caused by driver error. Primarily ask the driver about DPF lamp illumination in the past.
Circuit/System Testing DTC P244B
