Error Code P204E: What It Means & What To Do?

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The trouble code P204E can be elucidated as Reductant Pressure Sensor Circuit Intermittent/Erratic. 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 reductant pressure sensor circuit is being monitored by the powertrain control module. This trouble code would be set by the PCM when the degree of voltage in the reductant pressure sensor circuit would not be as per the specifications set by the manufacturer.

What causes this problem with the Reductant Pressure Sensor Circuit Intermittent/Erratic?

• Malfunctioning reductant pressure sensor
• Reductant pressure sensor harness might be unlocked
• Reductant pressure sensor circuit might have bad electrical connection

1. Engine Control Module - The solenoid might cause a short in the engine control module because of corrosion in the solenoid or the wire running from the solenoid to the ECM harness.
2. Electronic Control Unit – The ECU power management control module keeps in check the hybrid battery charging functions. If the ECU is faulty, the battery pack will not be able to properly get charged and thus, the ECU might need replacement.
3. Powertrain Control Module - A trouble with the PCM would mean that it is unable to determine the right fuel mixture and would send the car engine either more or less fuel than it requires. Now when the engine gets more, the carbon emission would increase and fuel economy would drop. In case of the opposite, the engine will choke, stutter, and might start stalling sometimes.
4. Fuel Injector – Bad fuel injectors can cause starting issues, poor idles and affected performance. Thus, the replacements are in order. Buy new fuel injectors now!
5. Exhaust Gas Recirculation Valve - If the PCM detects any fault in the vehicle’s EGR valve circuit, it will set up the check engine light so that the driver is notified about the fault. Properly check for the EGR valve faults leading to this OBD code getting stored in the system. Get the faulty EGR valve replaced or else this fault code can turn up.
6. Diesel Exhaust Fluid Pump – Faulty DEF pump can lead to increased emission and affected vehicle performance. It can also hamper the fuel economy and the power output of the vehicle. Thus, replace faulty DEF pump now!
7. Diagnostic Tool – Usually any OBD code problem requires deep insight into the problem and high grade tools in order to fix it properly. Thus, buy quality diagnostic tools form 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
• No occurrence of DPF regeneration

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:

• The malfunctioning reductant pressure sensor harness should be repaired or replaced as per the need
• You must fix the defective reductant pressure sensor
• Make sure to mend the faulty engine control module
• Carefully adjust the faults in the reductant pressure sensor circuit
• The electronic control unit should be restored to working order

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

The advanced steps become very vehicle specific and need the appropriate advanced equipment to perform in the right way. There would a need of a digital multimeter and the specific technical references to carry out this procedure. Voltage requirements will vary depending upon the specific year, make and model of the vehicle.

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.

Here is the Step 1

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.

Here is the Step 2

If actual reductant system pressure is as per the specifications, the code P204E 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 P204E Code

• PCM might start failing
• Some issues related to the reductant pressure sensor
• Issues with the car wiring