P0404 - OBD Trouble Code

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If the engine control module would detect that the engine exhaust gas recirculation (EGR) valve or sensor is out of specification range or its performance has gone out of specification parameters, then it would start triggering up the P0404 trouble code.

The error code P0404 can be defined as Exhaust Gas Recirculation Circuit Range/Performance.

The main function of the Exhaust Gas Recirculation system is to redirect exhaust gas back into the cylinders. Now if the exhaust gas is inert, then it would displace the oxygen and fuel, which would then lower the temperature of the cylinder resulting in lowers oxides of nitrogen emissions. That is the reason why it should carefully meter into the cylinders via EGR valve so that the overall performance of the engine does not get affected. If there would be too much EGR, then the car engine won’t be able to idle.

What causes this problem with the Exhaust Gas Recirculation Circuit Range/Performance?

• The valve might be out of a set position when the EGR was commanded closed
• The EGR valve movement should be smooth without jerking or the ECM sets the code
• The EGR sensor might go above upper limits when the EGR was commanded open by the ECM

1. EGR Valve Gasket - OBD Code P0404 can appear because of faulty EGR Valve Gasket.
2. Powertrain Control Module - There can be some issues with the Powertrain Control Module due to which you may see P0404 code appearing over and over again. Visit us to buy best quality PCM online.
3. Crankshaft Position Sensor - Are you facing some faults in your Crankshaft Position Sensor? Don’t worry and get them replaced or else P0404 code can turn up.
4. Engine Coolant Temperature Sensor - Common cause behind this P0404 error code can be some fault in Engine Coolant Temperature Sensor. So, it will be a good decision to replace them now.
5. Air Intake temperature Sensor - Crankshaft Position Sensor is perfectly fine but still but having that trouble code P0404 flashing? In such a situation your Air Intake temperature Sensor might be faulty. Why don’t you think of getting that replaced?
6. Fuel Pressure Regulator - The P0404 code can also arise due to some issues in Fuel Pressure Regulator. So, it is advised to replace them as soon as possible.
7. Engine Control Module - P0404 code does not really end up spoiling your Fuel Pressure Sensor, but it might also accompany few Engine Control Module issues. We have best Engine Control Module with us.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0404 here:

Common Symptoms

• There can be pre-ignition on acceleration by the car engine
• Illumination in the check engine light
• Car engine can start running roughly or may hesitate

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 P0404:

• Make sure to replace the EGR valve if it stuck partly open from carbon build-up in the pintle area and cannot be cleaned.
• It would be a good idea to replace the EGR position sensor if it is determined that it cannot give a correct input reading to the ECM when moved manually
• Carefully repair the wiring that is shorted or open to the EGR position sensor or connector

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If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

• Scan the code and carefully document the freeze frame data in order to verify the problem
• The next step would be to clear the engine codes and road test to verify if the concern comes back
• Monitor the EGR sensor pad on a scanner to see if sensor indicates the valve is stuck open or not moving smoothly
• The EGR sensor should be removed and manually operate the sensor to isolate a valve or sensor failure
• Then you should remove and inspect the EGR valve to verify it is not carboned up, causing the bad sensor readings

Common Mistakes When Diagnosing The P0404 Code

• A common mistake can be not operating the EGR position sensor manually to isolate a valve or sensor failure before replacing components
• Another mistake can be not inspecting the wiring harness and connection to the EGR position sensor for issues before replacing the EGR valve or the EGR position sensor

P0403 - Exhaust Gas Recirculation Circuit Malfunction