Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P2459 58

Diesel Particulate Filter (DPF) Regeneration Frequency

Circuit/System Description

The soot particles accumulate in the channels of the DPF and are burned off at regular intervals, through a process called regeneration or cleaning. The DPF cleaning process prevents the DPF from clogging. Excess soot in filter can cause a drop in engine performance and crack the filter during regeneration.

Conditions for Running the DTC

•	The engine is running.

•	The engine coolant temperature (ECT) is between 73-96°C (163-205°F).

Conditions for Setting the DTC

•	The ECM detects too many interrupted regenerations.

•	The above condition is met.

Action Taken When the DTC Sets

DTC P2459 is a Type C DTC.

Conditions for Clearing the DTC

DTC P2459 is a Type C DTC.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1.	The following conditions must be met for the ECM to perform the DPF Service Regeneration:

•

The A/C is OFF.

•

The vehicle is in Park or Neutral.

•

Start and idle the engine.

•

The engine coolant temperature is greater than 80°C (176°F).

2.	Perform the DPF Service Regeneration.

3.	Verify the DTC does not reset.

4.	If the DTC resets, replace the DPF filter.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.