P2456 OBD Error Code: Problem & Solutions

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The trouble code P2456 can be described as Diesel Particulate Filter Pressure Sensor A Circuit Intermittent. 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. This would also give rise to the illumination of the check engine light.

The diesel exhaust fluid (DEF) is utilized to aid while converting the surplus exhaust particles to harmless gases. Well, to completely burn off those particles, an increased temperature is required in the exhaust system. It should be noted that an injection of DEF fluid is required into the exhaust stream in order to attain the optimum temperature diesel particulate filter (DPF).

What causes this problem with the Diesel Particulate Filter Pressure Sensor A Circuit Intermittent?

• The diesel exhaust fluid reservoir might be desolate
• Incorrect diesel exhaust fluid
• The DPF pressure sensor might be damaged
• Issue of clogged DPF pressure sensor tubes/hoses
• DPF pressure sensor A circuit is open or small
• Unsuitable DPF regeneration
• Faulty DPF regeneration system

1. Electronic Control Unit – ECU monitors the temperature differences in the boost converter with the help of the temperature sensors to prevent the converter from overheating and malfunctioning. Thus, replace faulty ECU immediately.
2. Exhaust Gas Recirculation Valve - Did you just see check engine light flashing on your dashboard? If the computer would detect some fault with the automobile’s EGR valve circuit, then it would set up the check engine light so that the driver is notified about the fault. Don’t waste time and get them replaced or else this fault code can turn up.
3. Engine Control Module - ECM failures and faults can be very difficult to find and resolve as these are very rare and might require a complete reprogramming of the system to avoid wrong codes from getting stored in the system, leading to misdiagnosis. Replace it now!
4. Exhaust System Parts - You are likely to notice smoke coming out of the system if you don’t change your exhaust system parts right away when they are diagnosed as defective. This is harmful not only for the system but also for the plastic parts located nearby. Parts Avatar is just the right place for you that offers the excellent quality products at the prices you have always been looking for.
5. Diesel Exhaust Fluid Pump – If the DEF pump will not function properly, it can cause increased emissions in the exhaust system and reduced the longevity of the filtration elements in the exhaust system. Thus, replace faulty pump immediately.
6. Powertrain Control Module - Faulty PCM can disrupt the normal functioning of the vehicle by affecting the transmission system and the fuel delivery system. This will cause the system to store wrong OBD error and thus can lead to misdiagnosis.
7. Diagnostic Tool - In order to be that DIY guy, you need few diagnostic tools to get your car problems pointed out easily. Our diagnostic tools collection will come handy to do so, so why not have a look?

We care for our customers and that’s why we can totally understand your problem. That’s the reason why we have listed out some major symptoms behind the flashing up of OBD Code P2456. They are mentioned here as follows:

Common Symptoms

• Check engine light can start flashing up
• Some issues related to excessive black smoke from exhaust of the vehicle
• Bad engine performance
• There can be inflated engine temperatures
• The temperature of the transmission might be high

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P2456:

• Carefully adjust the faults in the DPF pressure sensor
• The flawed DPF pressure sensor A harness should be restored to working order
• Recondition the non-functioning DPF regeneration system parts
• You must fix the defective DPF pressure sensor A circuit
• Make sure to mend the faulty DPF pressure sensor tubes/hoses
• Adjust the flawed diesel exhaust fluid

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Do you wish to diagnose P2456 error code easily? 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. You may also need to obtain diagnostic flow charts, wiring diagrams, connector face views, connector pinout charts, component locations, and component testing procedures/specifications from the vehicle information source. All this information will be needed to correctly diagnose the stored code P2456. You must always start with a visual inspection of the wiring harnesses and connectors. Make sure to pay specific attention to wiring that is routed near hot exhaust constituents and sharp edges. Check the battery and battery terminal ends at this time and check alternator output. After that the scanner should be connected and all the stored codes as well as freeze frame data should be retrieved properly. You can always note this information down for future reference. It might come in handy if this code proves to be intermittent. After that the codes should be cleared up and the automobile should be taken out for the test drive. Now if the code immediately resets, then inspect to make sure that diesel exhaust fluid is present and that it is of the right type. This code is generally stored due to lack of diesel exhaust fluid. if the right type of diesel exhaust fluid is not present, then the DPF will not be regenerated effectively and then it would lead to an increase in the exhaust pressure. The manufacturer’s service manual can be consulted for instructions on how to test the DPF pressure sensor using the DVOM. If the sensor would not comply with manufacturer’s resistance specifications, then it would indicate that it is faulty and thus, it should be replaced. But if the sensor is in good working condition, then inspect for clogs and/or breakage in the DPF pressure sensor supply hoses. The hoses should be cleaned and replaced as per the requirement. Make sure to use high temp silicone hoses. If the sensor is in good working condition and supply lines are intact, then the next step would be to start testing system circuits. All associated control modules should be disconnected prior to testing resistance and/or continuity with the DVOM. Repair or replace open or shorted circuits as per the requirement. Here are some additional diagnostic notes which would prove to be very helpful. If you find out that the DPF pressure sensor hoses are melted or cracked, then they should be rerouted after replacement. The owners/service manual should be consulted to find out if your vehicle is equipped with an active DPF regeneration system or a passive system. Clogged sensor ports as well as clogged sensor tubes are common.

Common Mistakes When Diagnosing The P2456 Code

• Exhaust might start leaking
• The exhaust pressure sensor might start failing
• Non observance of the exhaust system parts