P204B OBD Error Code: Problem & Solutions

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The trouble code P204B can be described as Reductant Pressure Sensor Circuit Range/Performance. The error code P204B would start triggering when the PCM would detect some fault in the degree of voltage in the reductant pressure sensor circuit. One thing which you must keep in mind that its symptoms as well as causes would surely vary as it depends upon a number of things.

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. This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code. The P204B trouble code would indicate that the degree of voltage in the reductant pressure sensor circuit which is not as per the predetermined limit has been detected by the PCM. Now when this would occur, the fault code would be stored and there would be an illumination in the malfunction indicator light.

What causes this problem with the Reductant Pressure Sensor Circuit Range/Performance?

• Defaults in the reductant pressure sensor
• Reductant pressure sensor harness is open or shorted
• Reductant pressure sensor circuit poor electrical connection

1. Engine Control Module - There can be some engine performance issues due to faulty engine control module. If the ECM fails or has any problems it can lead to performance issues with the vehicle like misfires, hesitation, loss of power, and sometimes even decreased fuel economy.
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. 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. 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.
5. Powertrain Control Module - PCM stands for powertrain control module. It is a car part, a control unit which is utilized on motor vehicles. It is generally a combined control unit, consisting of the engine control unit (ECU) and the transmission control unit (TCU).
6. Electronic Control Unit - If your automobile's check engine light remains on constantly, and never goes off, there's a good chance that your vehicle has a damaged electronic control unit. There are a lot of reasons why a car's check engine light will remain on. The most common reason is a defective ECU.
7. Diagnostic Tools - It is always advisable to use correct tools and equipment while resolving any OBD code issue as even small mistakes can lead to wrong diagnosis. Thus, always take help from a professional who has the knowledge and experience to such tools in efficient manner. Buy new quality diagnostic tools from us today!

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P204B code by mentioning some major symptoms below:

Common Symptoms

• Illumination in the service engine soon light
• 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 P204B:

• Carefully adjust the faults in the reductant pressure sensor circuit
• Recondition the non-functioning reductant pressure sensor harness
• You must fix the defective PCM
• Rehabilitate the defaults in the electronic control unit
• Adjust the flawed reductant pressure sensor

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

• Use an OBD-II scanner in order to verify that the code is present, and check for other codes for any other type of error or problem that might need attention
• The current data along with freeze frame data are recorded, and the codes are then cleared to see if they reoccur.
• The vehicle is inspected for any problems with the wiring and connectors to check for loose connections, corrosion, or shorts.
• A scanner should be used to retrieve all stored codes and pertinent freeze frame data. 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 fau
• If actual reductant system pressure is as per the specifications, the code P204B would exist, and the sensor is in working order, use the DVOM to test input and output signal circuits between the pressure sensor and the PCM/SC 

Common Mistakes When Diagnosing The P204B Code

• There can be a failure in the powertrain control module
• Defaults in the reductant pressure sensor
• Some issues related to the wiring