FAQ: What Does Error Code P0404 Mean?

P0404 is an OBD-II generic code that the engine control module (ECM) detected the engine exhaust gas recirculation (EGR) valve or sensor is out of specification range or its performance has gone out of specification parameters.

Is a P0404 code bad?

Diagnostic Trouble Code (DTC) P0404 stands for Exhaust Gas Recirculation Circuit Range/Performance Problem. This can be bad as, for example, too much exhaust gas can make it difficult for the engine to idle.

How do you fix an exhaust gas recirculation circuit malfunction?

What repairs can fix the P0403 code?

  1. Replacing the shorted or open EGR vacuum solenoid.
  2. Replacing a corroded connector to the EGR vacuum control solenoid.
  3. Repairing the wiring shorted to the EGR vacuum control solenoid.

What does exhaust gas recirculation control circuit range performance mean?

OBD-II Code P0404 is defined as a Exhaust Gas Recirculation Circuit Range/Performance. NOx gases, which cause acid rain and respiratory problems, are formed when the engine’s combustion temperature is too high (2500° F). EGR systems are used to reduce the combustion temperature, thus reducing NOx formation.

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Can I drive with a bad EGR valve?

Can I drive with a bad EGR valve? Technically, you can drive your vehicle with a bad EGR valve, but your vehicle will run rough, shake at idle, and a check engine light will be illuminated. You might also hear popping sounds while driving down the road.

What’s the signs of a bad EGR valve?

What are the symptoms of a failing EGR valve?

  • Your engine has a rough idle.
  • Your car has poor performance.
  • You have increased fuel consumption.
  • Your car frequently stalls when idling.
  • You can smell fuel.
  • Your engine management light stays on.
  • Your car produces more emissions.
  • You hear knocking noises coming from the engine.

How much does it cost to replace a EGR valve?

The average cost of replacing the EGR valve in your vehicle is anywhere from $250 to $350 on average, depending on your vehicle’s year, make, and model as well as the type of system it has. The cost of parts will be somewhere around $190 to $270, while the cost of labor will be anywhere from $60 to $80.

How is P0404 diagnosed?

What Are the Symptoms of Code P0404?

  1. Check engine light.
  2. Pinging on acceleration.
  3. Engine may run rough.
  4. High nitrogen oxide emissions.
  5. Possible Stalling.

How can I test my EGR valve without a vacuum pump?

So one way to check the EGR solenoid is to simply disconnect the vacuum line at the EGR valve and plug it with golf tee or something. Let the engine warm up to operating temp, then start driving around GENTLY. Once you hit speeds of over 25 mph, you should see the SES light illuminate. It should be code 32.

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Where is the exhaust gas recirculation sensor?

The EGR temperature sensor is usually mounted in the exhaust manifold or mounted near the EGR valve.

What causes code P0405?

Code P0405 is triggered when the EGR position is below the ECM expected sensor position and the most common cause is the EGR sensor has an open circuit internally.

What causes P0406 code?

The P0406 code is the result of the exhaust gas circulation (EGR) sensor A having a high circuit voltage. This code is set when the ECM identifies the EGR voltage is higher than the specified range, thus triggering the check engine light to illuminate on the vehicle dashboard.

What is the EGR position sensor?

The EGR Position sensor detects the movement and position of the EGR valve pintle. The EGR Pressure sensor detects exhaust gas flow through the EGR passage. Sensors pass meticulous quality control to assure accurate voltage output.

How do you test an EGR valve?

How to Test an Electric EGR Valve

  1. Turn the vehicle off and remove the key from the ignition.
  2. Open the hood and locate the EGR valve.
  3. Turn the multimeter on and set the dial to “Volts DC.” Attach the red lead wire to the EGR circuit labeled “C.” There are five circuits on the EGR and each is labeled A-E.

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