GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Holden 🢒 2008 🢒 Captiva 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC P244A, P244B, or P2453

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 Descriptors

DTC P244A: Diesel Particulate Filter Differential Pressure Too Low

DTC P244B: Diesel Particulate Filter Differential Pressure Too High

DTC P244B 11: Diesel Particulate Filter Differential Pressure Too High Above Maximum Threshold

DTC P2453: Diesel Particulate Filter Differential Pressure Sensor Performance

DTC P2453 08: Diesel Particulate Filter Differential Pressure Sensor Performance Signal Invalid

DTC P2453 11: Diesel Particulate Filter Differential Pressure Sensor Performance Above Maximum Threshold

DTC P2453 12: Diesel Particulate Filter Differential Pressure Sensor Performance Below Minimum Threshold

DTC P2453 18: Diesel Particulate Filter Differential Pressure Sensor Performance Signal Amplitude Less Than Minimum

DTC P2453 55: Diesel Particulate Filter Differential Pressure Sensor Performance Expected Number Of Transitions/Events Not Reached

DTC P2453 58: Diesel Particulate Filter Differential Pressure Sensor Performance Incorrect Reaction After Event

Circuit/System Description

The diesel exhaust after-treatment system consists of an under hood pre-catalytic converter and an underbody catalytic converter. The underbody catalytic converter also consists of the main Diesel Oxidation Catalyst (DOC) and the coated Diesel Particulate Filter (DPF). One of the main purposes of the DPF is to collect particulates from the engine exhaust in order to minimize discharge of soot to the atmosphere. The soot particles accumulate in the channels of the DPF and are burned off at regular intervals through a process called regeneration. This prevents the DPF from clogging. The ECM commands the DPF regeneration after calculating various vehicle conditions such as DPF pressure difference, exhaust gas temperature, engine oil quality, engine speed, etc. Excessive accumulation of the soot in the DPF can cause a drop in the engine performance. During regeneration, additional fuel is injected via multiple post injections in order to increase the exhaust gas temperature. During this period, the DPF temperature is raised to approximately 600°C and the accumulated soot is oxidized or burned off into carbon dioxide (CO2).

The pressure pipes, which are connected to the DPF pressure sensor, measure the level of soot deposit in the DPF and protect the engine by triggering regeneration when critical soot level is detected in the filter.

Conditions for Running the DTC

P244B, P244B 11, P2453 08, P2453 11, P2453 12, P2453 55, P2453 58

    • The ignition is ON.
    • The DTCs run continuously when the above condition is met.

P244B, P244B 11, P2453 08, P2453 11, P2453 12, P2453 55

    • The ignition is switched from ON to OFF.
    • The DTCs run after a 2 second delay when the above condition is met.

P2453 58

    • The ignition is ON.
    • The intake air temperature (IAT) sensor is less than 0°C (32°F).
    • The DTC runs continuously when the above condition is met.

Conditions for Setting the DTC

P2453, P2453 08, P2453 18, P2453 55

The ECM detects an invalid signal from the DPF differential pressure sensor for greater than 0.5 seconds.

P244B, P244B 11

The ECM detects the DPF differential pressure sensor signal is greater than 90 kPa (13 psi) for greater than 1 second.

P244A, P2453 12

The ECM detects the DPF differential pressure sensor signal is less than 4 kPa (0.6 psi) for greater than 1 second.

P2453 58

The ECM detects an invalid signal from the DPF differential pressure sensor when the IAT is less than 0°C (32°F).

Action Taken When the DTC Sets
    • DTCs P244A, P244B, P2453, P2453 11, and P2453 12 are Type A DTCs.
    • DTCs  P2453 08, P2453 18, and P2453 55 are Type B DTCs.
    • DTC P2453 58 is a Type C DTC.

Conditions for Clearing the DTC
    • DTCs P244A, P244B, P2453, P2453 11, and P2453 12 are Type A DTCs.
    • DTCs P2453 08, P2453 18, and P2453 55 are Type B DTCs.
    • DTC P2453 58 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. Ignition ON, observe the DTC information with a scan tool. Verify that no other DTCs are set.
    2. ⇒If any other DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
  2. Engine idling, observe the scan tool diesel particulate filter data parameter. The reading should be within 0-10 kPa (0-1.5 psi).
  3. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

    4. Important: Observe the scan tool distance since last DPF regeneration data parameter. Do Not perform a DPF regeneration if it has been performed recently.

    ⇒If not within the specified range, perform a DPF regeneration.
  4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing
  1. Ignition OFF, inspect for the following:
    2. • Intake system/charge air hoses for leaks/restrictions
    • Exhaust system/turbo charger for leaks/restrictions
    • Air filter for restrictions
    ⇒If a condition is found, repair as necessary.

    Important: If DTC P2453 58 is set, inspect for moisture in the hoses/pipes to the DPF pressure sensor.

  2. Ignition OFF, inspect the hose/pipes to the DPF pressure sensor for leaks, or restrictions.
    3. ⇒If a condition is found, repair as necessary.
  3. Ignition OFF, and the MAIN fuse removed, disconnect the harness connector at the DPF sensor.
  4. Test for less than 5 ohms between the low reference circuit terminal 2 and ground.
    5. ⇒If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Install the MAIN fuse. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.
    6. ⇒If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the ECM.
    ⇒If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Verify the scan tool DPF sensor voltage parameter is greater than 4.8 volts.
    7. ⇒If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
  7. Install a 1A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool DPF sensor voltage parameter is less than 0.5 volts.
    8. ⇒If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  8. Ignition OFF, connect the harness connector at the DPF pressure sensor.
  9. Ignition ON, verify the scan tool DPF pressure sensor parameter is between 0.45-0.55 volt.
    10. ⇒If not within the specified range, replace the DPF sensor.
  10. If all circuits test normal, replace the DPF.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Exhaust Pressure Sensor Replacement
    •  Exhaust Particulate Filter Replacement
    •  Control Module References for ECM replacement, programming and setup