P2459 - DIESEL PARTICULATE FILTER REGENERATION FREQUENCY

Modern vehicles remove most of the carbon through the Diesel Particulate Filter (DPF). The DPF has an internally designed filter element with wall fibres that attract fine soot particles. These particles are trapped in a filter element. In this process, a flammable liquid is electronically injected into the filter so that the stored particles can be burned and then expelled through the exhaust pipe.

When the Powertrain Control Module (PCM) detects that the DPF regeneration frequency does not match the data provided by the manufacturer, the diagnostic code P2459 OBDII will be set.

• Check Engine Lamp ON.
• Increase in exhaust emissions.
• Difficulty in maintaining the revolutions per minute.
• High engine temperature.

The DTC P2459 OBD2 is stored for the following reasons:

• The wiring related to the Diesel Particulate Filter may be damaged, resulting in an open circuit.
• Possibly the diesel exhaust fluid levels are not adequate.
• The Diesel Particulate Filter pressure sensor may be faulty.
• The filter element may be blocked or clogged.

Steps to solve the P2459 OBDII fault code:

• Check the Technical Service Bulletins (TSBs) that apply to your vehicle model.
• Verify that the wiring harness and connectors for the Diesel Particulate Filter system circuit are in good condition. If any components are found to be burned or damaged, initiate necessary repairs.
• Check that the exhaust fluid level meets the requirements provided by the manufacturer. If you observe that the levels are not adequate, initiate corrections.
• Use a DVOM to make function tests on the DPF Pressure Sensor, which should be receiving the correct voltage. If you detect a lack of power as recommended, make repairs as required, replace the sensor if necessary.