How do you fix P0404 in a Jeep?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

The P0404 code is a generic OBD-II diagnostic trouble code indicating an issue with the exhaust gas recirculation (EGR) system. This code is typically triggered when the EGR system is not functioning properly or when there is an issue with the EGR valve itself. In some cases, this code may also be triggered by a faulty EGR sensor.

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  • how do i fix error code p0404
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1. Check engine light is on

1.Start your car and allow it to idle for a few minutes. 2.Check the engine oil level. 3.If the engine oil level is low, refill the engine oil. 4.Check the air filter. 5.If the air filter is dirty, replace the air filter. 6.Check the spark plugs. 7.If the spark plugs are fouled, replace the spark plugs. 8.Check the fuel system. 9.If the fuel system is dirty, replace the fuel system. 10.Check the engine coolant. 11.If the engine coolant is low, refill the engine coolant. 12.Check the serpentine belt. 13.If the serpentine belt is cracked or frayed, replace the serpentine belt.

2. Replacing the EGR valve

There are several steps involved in replacing the EGR valve on a Jeep Cherokee. The first step is to locate the EGR valve. It is usually located in the engine compartment on the right side. Next, remove the cover plate. Next, remove the EGR valve by unscrewing it. Finally, replace the EGR valve with a new one.

3. Cleaning the EGR valve

  1. Remove the front fascia of the car.
  2. Disconnect the EGR valve from the intake manifold.
  3. Remove the two screws that hold the EGR valve in place.
  4. Lift the EGR valve off of the intake manifold.
  5. Clean the area around the EGR valve with a clean cloth.
  6. Apply a thin layer of sealant to the area around the EGR valve.
  7. Replace the EGR valve onto the intake manifold.
  8. Reinstall the screws that hold the EGR valve in place.

4. Checking for vacuum leaks

  1. Inspect the vehicle for any loose or missing hoses or connectors.
  2. If you find any loose or missing hoses or connectors, disconnect them and check for vacuum leaks.
  3. If you find any vacuum leaks, fix them by reattaching the hoses or connectors.

If you didn't find success with an option above, then try:

  1. Checking the EGR valve circuit
  2. Checking the PCM for codes