P204D - OBD Trouble Code

<<See All OBD Codes

The trouble code P204D can be explained as Reductant Pressure Sensor Circuit High. 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. The engine control module, powertrain control module or the transmission control module monitors this circuit depending upon the particular automobile.

If the powertrain control module would detect a variation in the voltage coming from the reductant pressure sensor circuit that is outside the parameters set by the automobile manufacturer, then it would store the P204D error code. This would also give rise to the illumination of the check engine light.

What causes this problem with the Reductant Pressure Sensor Circuit High?

• Some issues related to the reductant pressure sensor
• Unlocked reductant pressure sensor harness
• Unsatisfactory electrical connection in the reductant pressure sensor circuit

1. 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.
2. 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.
3. 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!
4. 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.
5. 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?
6. Diagnostic Tools – Use factory grade diagnostic tools to resolve OBD code P204D error. Buy new diagnostic tools and equipment for us.

There could be countless symptoms which that would accompany with this fault code. Willing to know some common symptoms of OBD Trouble Code P204D? Your wish is our demand. Have a look at them below:

Common Symptoms

• Check engine light might come into signal
• DPF regeneration might not take place

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:

• Carefully adjust the faults in the electronic control unit
• The reductant pressure sensor should be restored to working order
• Recondition the non-functioning powertrain control module
• It is necessary to perform proper service of the unsound reductant pressure sensor harness
• Adjust the flawed reductant pressure sensor circuit

Don’t get tensed if you are still facing any of these issues as we care for our customers and that’s why we offer a good range of def, pcm, reductant pressure sensor,pressure sensor signal, body control module component, fuel injection pump, pcm module, ecm module, electronic control module, exhaust system parts, diesel particulate filter, fuel injection kit and a lot more. We are sure that now all your issues would be resolved.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P204D code to be stored:

• 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.
• After performing a careful inspection, every of the stored codes and freeze frame data are retrieved as it can help down the way for further diagnosis process.
• 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.
• If actual reductant system pressure is as per the specifications, the code P204D 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 P204D Code

• Malfunctioning reductant pressure sensor
• There can be a failure in the powertrain control module
• Wiring problems