Error Code P2459: What It Means & What To Do?

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The trouble code P2459 can be explicated as Diesel Particulate Filter Regeneration Frequency. If the engine control module would detect a variation in the voltage coming from the diesel particulate filter (DPF) regeneration system delivered performance that is outside the parameters set by the automobile manufacturer, then it would store the P2459 fault code. This would give rise to the flashing up of the check engine light.

The P2459 error code would indicate that the regeneration process has not been completed with the desired frequency, over a programmed period of time (or amount of miles/km). This fault code should only be exhibited in diesel powered automobiles. This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model. The engine control module, powertrain control module or the transmission control module monitors this circuit depending upon the particular automobile.

What causes this problem with the Diesel Particulate Filter Regeneration Frequency?

• The DPF pressure sensor might be flawed
• Malfunctioning exhaust pressure sensor
• The diesel exhaust fluid might not be sufficient enough
• Some issues related to the diesel exhaust fluid
• The wiring to the DPF injection system is not shut or tiny  
• There can be distorted PCM or a PCM programming error

1. Diesel Exhaust Fluid Heater – If the diesel exhaust fluid heater is faulty, it will not be able to aid in conversion of harmful nitrous oxide compounds to nitrogen, carbon dioxide and water vapours to control emissions. Thus, replace it immediately.
2. Engine Control Module - Want to know the most common reason behind the failure in the engine control module? Corrosion or damage because of moisture can cause ECM failure. Corrosion might enter the ECM through the wiring harness and moisture can enter by a failure in the seals in the ECM itself.
3. Diesel Exhaust Fluid Pump - The diesel exhaust fluid pump needs to work properly if the transmission system has to perform. If it is not functioning, the transmission may slip and cause harsh shifts too. Thus replace faulty pump now and buy a new one from us!
4. Diesel Particulate Filter – The diesel particulate filter acts as an important component in managing the particulate emission in the exhaust system. If the filter is damaged, it may lead to increased emissions and pollutants through the tailpipe. Thus, replace damaged filter now!
5. Powertrain Control Module - The PCM makes the engine and transmission work in tandem. Any issue with the powertrain control module will cause major problems with the efficient running of the vehicle.
6. Exhaust Gas Recirculation Valve - If the PCM detects any fault in the vehicle’s EGR valve circuit, it will set up the check engine light so that the driver is notified about the fault. Properly check for the EGR valve faults leading to this OBD code getting stored in the system. Get the faulty EGR valve replaced or else this fault code can turn up.
7. Fuel Injector – The fuel injectors are important component of the fuel delivery system that helps in proper utilization of the fuel entering the engine. This not only helps in taking care of the air to fuel ratios in the engine, helping the combustion process but also enhances the performance. Thus, replace faulty injector now!
8. Fuel Tank Pressure Sensor – The fuel tank pressure sensor helps in many ways, most importantly by saving fuel, minimizing environmental pollution, and preventing damage to the engine. The pressure sensor, which is normally positioned inside or on top of the tank, works to detect the pressure in the fuel system, with the end goal of identifying leaks and defective gas caps. Thus, replace faulty sensor now!
9. Electronic Control Unit - If your vehicle fails to start for no apparent reason, this is also a good indicator that there can be some issues with the ECU. If you check the car battery, starter and other common electrical components, and the vehicle still does not start, a quirky electronic control unit should be the next logical thing to consider.
10. Diagnostic Tool - In order to fix these errors, you need few diagnostic tools to get your car problems pointed out easily. Our diagnostic tools collection will come handy to do so and resolve all your vehicle problems. Visit today!

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P2459 here:

Common Symptoms

• Check engine light might come into signal
• A lot of black smoke might start coming from the car exhaust
• There might be some other DPF codes which would usually accompany the P2459 fault code
• Lack of ability to maintain RPMs
• Rise in the engine temperature
• Overheated DPR housing or other exhaust constituents

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• Make sure to mend the faulty DPF pressure sensor
• It is essential to fill the diesel exhaust fluid
• Carefully adjust the faults in the wiring to the DPF injection system
• Recondition the non-functioning exhaust pressure sensor
• Adjust the flawed PCM or a PCM programming error

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Here are some steps which you should follow in order to diagnose this fault code:

• This is a general type of error code which is diagnosed with the help of a scanner.
• The mechanic will insert a scanner to diagnostic port of the vehicle and recover the codes and freeze frame data.
• The tools which are used to diagnose P2459 error code are a scanner, a digital volt/ohmmeter, and a vehicle service manual.
• Then it is essential to check all the system associated wiring harnesses and connectors. The harnesses that are situated near hot exhaust pipes and manifolds should be examined properly.
• Then you should load test the battery, inspect battery terminal ends, battery cables, and alternator output.
• After that the scanner should be connected to the diagnostic port and all stored trouble codes and freeze frame data should be retrieved properly.
• This information can prove to be very helpful in testing, so you can always write it down prior to clearing the codes and test driving the vehicle.
• Now if the code would fail to reset immediately after test driving, then check the level and quality of the diesel exhaust fluid and activate the DPF regeneration system.
• If the procedure of the regeneration would be inadvertently interrupted because of some other unrelated problem that has been rectified, the regeneration process may be completed successfully once the codes have been cleared.
• If the code would immediately reset, then the DVOM should be used and the manufacturer’s recommendations should be followed for checking the DPF pressure sensor. If the sensor fails to comply with manufacturer’s resistance specifications, then you must replace it.
• Here are some additional diagnostic notes which should be taken care of.
• Make sure to diagnose as well as repair the DPF pressure sensor codes before attempting to diagnose this code.
• Another thing to be kept in mind is that the DPF pressure sensor hoses/lines are prone to clogging and collapse.
• A very common cause of DPF regeneration failure is incorrect/insufficient diesel exhaust fluid.

Common Mistakes When Diagnosing The P2459 Code

• Flaws in the Diesel Particulate Filter (DPF)
• There might be a need to complete the manual regeneration

P2458 - Diesel Particulate Filter Regeneration Duration