P2452 OBD Error Code: Problem & Solutions

This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another. The diesel particulate filter pressure sensor is being monitored by the engine control module. This trouble code would be set by the ECM when the diesel particulate filter pressure sensor A circuit would not be as per the specifications set by the manufacturer.

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

• The diesel exhaust fluid reservoir might be vacant
• Some issues related to the diesel exhaust fluid
• Unusable DPF pressure sensor
• Blocked DPF pressure sensor tubes/hoses
• DPF pressure sensor A circuit might be unlocked
• Ineffective DPF regeneration
• Non functioning active DPF regeneration system

1. 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!
2. 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.
3. Engine Control Module - Dead cells in batteries can cause a failure in the engine control module. Many times a battery is left in the rig long after a cell has died. This would affect the grounding in the car battery.
4. 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.
5. Powertrain Control Module - If there are some faults in the PCM, then it may throw off the timing and fuel settings of the engine, which can negatively affect the performance. A flawed PCM may cause the vehicle to experience a reduction in fuel efficiency, power as well as acceleration.
6. Exhaust System Parts - Your exhaust system begins at the engine with the purpose of removing toxic gases and fumes from your vehicle. The components are a series of pipes, catalytic converters, sensors, mufflers, and often a resonator, as well as other emission devices. Thus, replace damaged exhaust system now!
7. Electronic Control Unit - Do you know that the poor performance or unexplained drops in fuel economy or efficiency are often associated to onboard car computer problems, or defective ECU issues?
8. Diagnostic Tools – Use factory grade diagnostic tools to resolve OBD code P2452 error. Buy new diagnostic tools and equipment for us.

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

• Visibility in the check engine light
• There might be a lot of black smoke coming out from vehicle exhaust
• The engine performance might start declining
• Inflated engine temperatures
• Excessive transmission temperatures

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• You must fix the diesel exhaust fluid
• Make sure to mend the faulty DPF pressure sensor
• It is essential to restore the flawed DPF pressure sensor A circuit
• Repair or replace the quirky DPF regeneration system parts
• Rehabilitate the defaults in the DPF pressure sensor tubes/hoses
• Adjust the flawed DPF pressure sensor A harness

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

After verifying the P2452 code with an OBD-II scanner, the mechanic should begin with a visual inspection of all electrical components. Use the vehicle information source to search for applicable technical service bulletins (TSB). If you locate a TSB that matches the vehicle make and model, symptoms exhibited, and the code stored, it will help you to arrive at a diagnosis.

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 P2452.

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 P2452 Code

• Exhaust pressure sensor might start failing
• Some issues related to the leakages in the exhaust
• Issues with the exhaust system parts