P2458 - OBD Trouble Code

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The trouble code P2458 can be elucidated as Diesel Particulate Filter Regeneration Duration. This error code would be set when the powertrain control module would detect that regeneration of the DPF does not complete in the expected time frame. One thing which should be noted here is that this error code only applies to diesel-powered applications.

The main role of DPF is to filter out and capture solid particles (soot) in diesel exhaust. It should then hold on to the soot until a predefined soot load is reached upon which the PCM initiates a process to burnt off the accumulated soot. This process is called as “regeneration”. If it is completed prosperously, then it would restore the DPF’s ability to capture more soot until the next regeneration cycle occurs.

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

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

1. Diesel Exhaust Fluid Pump – Faulty DEF pump can lead to increased emission and affected vehicle performance. It can also hamper the fuel economy and the power output of the vehicle. Thus, replace faulty DEF pump now!
2. Engine Control Module - Most of the time it is difficult to intercept the ECM faults and thus must be checked for thoroughly. There can be a problem with the circuit or the software might have malfunctioned. Thus repair, replace or reprogram the component as per requirement.
3. Fuel Injector - Facing some issues in starting your vehicle? Poor idle issues? Failed emissions? These are all the symptoms of bad, faulty, leaking and clogged fuel injectors. It would be a good decision to replace your defective fuel injector with a new one online.
4. Fuel Tank Pressure Sensor – The fuel tank pressure sensor is part of the fuel pump assembly and is mounted on top of the tank or inside the tank. It is part of the evaporative emissions system and reads pressure in the fuel system to detect evaporative leaks, such as a loose or faulty gas cap. Replace faulty pressure sensor now!
5. Powertrain Control Module - If the PCM is faulty, it can stores wrong OBD codes and can lead to misdiagnosis. This can happen due to misinterpretation of data received from the various sensors and components which also affects the vehicle’s performance. Thus replace it immediately.
6. Exhaust Gas Recirculation Valve – Bad EGR valve can cause many performance issues. Common signs include engine performance issues like decreased power and acceleration, rough idle, and the Check Engine Light coming on. Thus, replace faulty EGR valve now!
7. Electronic Control Unit – If the ECU is at fault, it will not be able to read the boost converter temperatures correctly leading to underperformance. Thus, replace faulty ECU now!
8. Diagnostic Tool - Choose from our diagnostic tools collection that will come handy to detect and correct the OBD error code.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• The service engine soon light can start lighting up
• There might be some other DPF codes which would accompany the P2458 error code
• A lot of black smoke might start coming from the exhaust
• Not able to produce and maintain desired RPM levels
• Rise in the engine temperature
• Excessive heat in the DPR housing or other exhaust components

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:

• You must fill the diesel exhaust fluid
• It is essential to restore the flawed wiring to the DPF injection system
• Repair or replace the quirky DPF pressure sensor
• Carefully adjust the faults in the exhaust pressure sensor
• Recondition the non-functioning 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:

• The mechanic or the technician will use a diagnostic scanner or code reader like DVOM to visually scan for the error codes in the vehicle.
• The tools which are used to diagnose P2458 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 P2458 Code

• Common mistakes while diagnosing this trouble code are unnecessary and expensive replacements which usually happen when one don’t follow all the steps carefully.
• The most common mistake while diagnosing this code is missing out on diagnosing steps which further leads to the expensive and unnecessary replacements. It is always recommended to seek help of experienced diagnostician to avoid any mistakes.

P2459 - Diesel Particulate Filter Regeneration Frequency