P204F OBD Error Code: Problem & Solutions

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The trouble code P204F can be defined as Reductant System Performance Bank 1. The reductant system is being monitored by the powertrain control module. This trouble code would be set by the PCM when the reductant portion of the selective catalyst reduction (SCR) system would not be as per the specifications set by the manufacturer. Bank 1 here denotes the bank of the engine that contains the number one cylinder.

The engine control module, powertrain control module or the transmission control module monitors this circuit depending upon the particular automobile. 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.

What causes this problem with the Reductant System Performance Bank 1?

• Malfunctioning reductant pressure sensor
• There can be inoperative reductant system injector
• Some issues related to the DEF
• Reductant system might be open or little
• Unusable SCR controller/PCM or programming error

1. 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!
2. Engine Control Module – It is not always the components, but the ECM that can also be faulty. It can cause misinterpretation of correct data thus leading to wrong operational decisions which will affect the transmission and overall engine performance. Thus, replace faulty module and reprogram it now!
3. 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.
4. 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!
5. Powertrain Control Module - Powertrain Control Module can also be faulty in rare cases and thus needs through checks for system and software errors. Thus check and replace it, if required.
6. Electronic Control Unit – The ECU manages the cooling system to control the battery operating temperatures and thus must be replaced, if found faulty. Thus, buy new ECU modules and components from us!
7. Diagnostic Tool – Make use of quality diagnostic tools to resolve any OBD error code. Buy quality diagnostic tools from us!

Willing to know some common symptoms of OBD Trouble Code P204F? Your wish is our demand. Have a look at them below:

Common Symptoms

• Visibility in the check engine light
• There might be no DPF regeneration

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 P204F:

• You must fix the defective DEF
• Make sure to mend the faulty SCR controller
• It is essential to restore the flawed reductant pressure sensor
• Repair or replace the quirky reductant system parts
• Rehabilitate the defaults in the reductant system injector
• Carefully adjust the faults in the PCM or programming error

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If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

A technician begins by hooking the vehicle to an OBD-II scanner to verify that the code is present, and check for other codes. The freeze frame data along with current data is recorded, and the codes are then cleared to see if they reoccur.

It would be a great idea to write this information down before the codes have been cleared. Then the vehicle should be taken out for a test-drive until the PCM either enters readiness mode or the code is reset.

Now if the PCM enters readiness mode at this time, the code is intermittent and it would be very difficult to diagnose. If this is the situation, the conditions which contributed to the code being stored may need to worsen before a correct diagnosis can be made.

If the code is immediately reset, the other step of your diagnosis would need that you search your automobile information source for diagnostic flow-charts, connector pin-out charts, connector face views, as well as constituent testing procedures/specifications.

The DVOM should be used to test the reductant pressure sensor according to manufacturer specifications. Components which do not test within maximum allowable parameters should be considered faulty.

Now if actual reductant system pressure is as per the specifications set by the manufacturer, the code P204F would exist, and the sensor is in working order. Then DVOM should be used to test input and output signal circuits between the pressure sensor as well as the PCM/SC.

Common Mistakes When Diagnosing The P204F 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.