P1471

DTC P1471 Diesel Particulate Filter Regeneration Insufficient

Description

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. After the regeneration event is finished an exhaust differential pressure monitors a purification of the filter. If the filter regeneration has been incomplete purification status continuously this DTC will set. This DTC will run once per regeneration event within enabling conditions.

Condition for Running the DTC

^ DTCs P0079 P0080 P0087 P0088 P0089 P0091 P0092 P0093 P0102 P0103 P0117 P0118 P0191 P0192 P0193 P0201 - P0204 P0234 P0261 P0264 P0267 P0270 P02E2 P02E3 P02E7 P02E8 P02E9 P0300 P0301 - P0304 P0335 P0403 P0405 P0406 P0500 P0545 P0546 P0602 P0606 P062F P0642 P0643 P0652 P0653 P1125 P1293 P2002 P2032 P2033 P2080 P2084 P2146 - P2151 P2227 P2228 P2229 P2453 P2454 P2455 and P268A are not set.
^ The battery voltage is between 10 to 16 volts.
^ The ignition switch is ON.
^ The engine speed is more than 1000 RPM.
^ The intake airflow valve position is more than 20%.
^ The exhaust gas temperature 2 (in front of filter) is more than 212°F (100°C).
^ The exhaust brake valve is commanded OFF.
^ The DPF regeneration event is finished.

Condition for Setting the DTC

^ The filter regeneration has been incomplete purification status continuously.

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

^ If emergency regeneration is frequently requested refer to DPF System Emergency Regeneration Frequently chart in symptom diagnostic table.
^ An excessive ash accumulation in the filter will cause this DTC to set.
^ The mass air flow (MAF) sensor problem will cause this DTC to set. Refer to DTC P0101 for MAF sensor diagnosis and Use the Scan Tool Data List or a known good vehicle to determine nominal values.

Circuit/System Testing DTC P1471