GM Service Manual Online
For 1990-2009 cars only

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 provide an overview of each diagnostic category.

DTC Descriptor

DTC P2463: Diesel Particulate Filter Soot Accumulation

Circuit/System Description

The diesel particulate fuel (DPF) differential pressure sensor is established to detect difference in press in DPF. The engine control module (ECM) always detects differential pressure in DPF with the DPF differential pressure sensor installed in DPF front and back and detects quantity of sedimentation of PM.

Conditions for Running the DTC

    • The battery voltage is between 10-16 volts.
    • The ignition switch is ON for longer than 2 seconds.

Conditions for Setting the DTC

The ECM detects that the diesel particulate filter differential pressure status is abnormal condition. The DPF status is abnormal.

Action Taken When the DTC Sets

DTC P2463 is a Type A DTC.

Conditions for Clearing the DTC

DTC P2463 is a Type A DTC.

Diagnostic Aids

An incorrectly installed DPF differential pressure sensor will cause this DTC to set.

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

Verify the integrity of the engine exhaust system by inspecting for the following conditions:

    • Damaged components
    • Loose or improper installation
    • DPF system

Circuit/System Testing

Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Ignition OFF, inspect the DPF filter.
  2. If broken, clogged, or melted condition is detected, replace the DPF filter.
  3. Ignition ON for longer than 30 seconds, learning the 0 position of DPF differential pressure.
  4. Command the DPF regeneration with a scan tool. Perform the DPF regeneration.
  5. Clean the DPF filter with an Ash Cleaner.
  6. Start the engine and operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
  7. If detect the DTC, replace the control module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    • DPF Filter Replacement
    •  Control Module References for ECM replacement, setup, and programming