Code P2004. Intake manifold runner check stuck in open bank 1

If you have a problem with the code P2004 that means the intake manifold runner control actuator is stuck in the open position.

This simple guide will explain exactly what that means and what you should do about it. Automotive troubleshooting may seem intimidating, but modern cars have a great built-in system to help with this process.

OBD-II-equipped vehicles, which are all modern vehicles, can emit an error code, alerting you to the exact problem in your car. You simply need to have the right tool to read the code.

Intake Manifold Operation

intake manifold It is the part of the engine that supplies the fuel and air mixture to the cylinder head. Essentially, this is the part that controls how fuel is pumped to the part of the engine that burns fuel to produce power.

This system is controlled by the powertrain control module, which means that if the actuator is stuck, it could be an issue with the intake manifold or the powertrain control module.

There are several ways the process of introducing fuel into cylinders can work. Most commonly, each cylinder has a separately controlled metal flap that limits the entry of air and fuel mixture.

Sometimes all the metal fins are connected by a metal rod, which means that all the cylinders are synchronized and receive the air-fuel mixture at the same time.

Sometimes it is achieved using a vacuum diaphragm. If this is the case, it will be controlled by an electronic intake manifold solenoid.

You may also be interested in Error Code P2008 – Intake manifold slide control circuit/open bank 1

What is Code P2004?

The P2004 fault code It can be explained how: Intake manifold runner check stuck in open bank 1”. This trouble code is generic, meaning it can be triggered on any car with an OBD-II system.

The specifications in the definition, troubleshooting steps, and repairs can always vary from one vehicle brand to another.

It is the engine control module (ECM) that examines intake manifold runner control. The ECM sets this trouble code when the intake manifold runner control is outside the parameters set by the manufacturer.

The ECM provides information to the IRMC about the current driving conditions. The IRMC then uses this information to regulate the amount of airflow allowed into the intake system.

Regulation of intake airflow reduces harmful emissions, improves the air/fuel mixture and improves the vehicle’s fuel efficiency.

IRMC components include:

  • Electric solenoid.
  • Vacuum actuator.
  • Butterfly valve plates.
  • Air passage to each cylinder.
  • Connecting rods connected at the intake manifold throttle plate level.
  • Return springs that keep the butterfly valve plates open.

Error code P2004 is stored when the ECM detects that the actuator (IMRC) for engine bank 1 is stuck in the open position. Bank 1 indicates that the problem occurred in the engine bank containing cylinder number one.

What Are the Symptoms of Code P2004?

If you are suffering from an intake manifold runner check that is stuck open, there are a few symptoms you will likely notice.

Chances are that at least one of your cylinders is not firing, which can be very easy to recognize. The symptoms this could cause are:

  • Poor engine performance.
  • Poor fuel efficiency.
  • Sudden motor surges.
  • Decrease in low-end torque.
  • The engine may sputter.
  • The vehicle may run rough.
  • The Check Engine light comes on.

There are many things that can cause a cylinder to fail to fire, such as a faulty spark plug. If you notice that one of the cylinders is not firing, you cannot assume that it is because the inlet valve is left open. You must make a correct diagnosis.

What Causes Code P2004?

Since IMRC involves many components, there are many things that could go wrong in this component. Possible causes of this code include:

  • Defective IMRC solenoid.
  • Short, broken, or frayed wires on the IMRC solenoid.
  • IMRC solenoid open or shorted.
  • Corrosion in the IMRC solenoid.
  • Broken or loose IMRC throttle valve plate screws.
  • IMRC butterfly valve plate broken.
  • The butterfly valve plate is disconnected from the IMRC actuator.
  • Clogged vacuum control solenoid vacuum filter.
  • Debris trapped in vacuum control solenoid.
  • Broken or disconnected vacuum lines.
  • Carbon buildup on IMRC butterfly valve plates.
  • EGR valve trouble codes.
  • MAF Sensor Trouble Codes.

P2004 Code Diagnosis

We’ve included the basic steps below, but refer to a repair guide specific to your car’s year, make, model, and powertrain for specific steps.

If you want to easily diagnose this fault code, you need to follow the steps mentioned below:

  1. Diagnosis should begin with a visual inspection of the system wiring and connector. An open circuit can occur due to corrosion in the IMRC actuator connectors, so it is essential to pay attention to these.
  2. Use a scanner to note the freeze frame data, to gather details about the code. You can also check for the presence of additional codes.
  3. Now, if there are a number of codes, they must be addressed in the same order that they appear on the scanner.
  4. After this, you need to reset the fault codes, restart the vehicle, and check if the code remains activated. If not, it is likely that the code was activated incorrectly or represents an intermittent problem.
  5. Next, you need to check the IMRC actuator solenoid and the IMRC runner position sensor. You can always consult a vehicle information source to verify recommendations for these components.
  6. A multimeter should be used to perform a resistance test on both components. If the actuator or position sensor does not meet the specifications set by the manufacturer, the defective parts must be replaced and then the entire system must be retested once again.
  7. If the actuator resistance and sensor resistance meet the specifications set by the manufacturer, a multimeter should be used to check resistance and continuity in all system circuits.

How to Repair Code P2004

There are many things that can cause this problem, which means that you must determine the cause before you can fix it. Before you begin, it may be helpful to investigate whether the make and model of your car typically have this problem.

Your car may have a history, which would make diagnosing the specific cause much easier.

Diagnosis should start with the circuit, which can be easily damaged. Check for faulty connectors that may also have been damaged.

If it doesn’t appear to be an electrical problem, you should check the sensors that determine whether the valve is open or closed. You can use a digital multimeter to test the sensors.

If that also returns nothing, you should check for faulty or damaged components. It is possible that the rivets securing the valve are loose, or have fallen out completely, or that the valve itself has simply become stuck.

Common Errors When Diagnosing Code P2004

Take a look at some mistakes that can be made when diagnosing and repairing:

  • Misdiagnosis and replacement of IMRC solenoid.
  • Misdiagnosis and replacement of IMRC butterfly valve plates.
  • Failure to miss faulty or disconnected vacuum lines.
  • Neglected wiring and faulty IMRC solenoid connector.
  • Replaced IMRC butterfly valve plates when the problem was that they were not connected correctly.

Components To Repair Or Replace With Code P2004

  • Engine control module: The solenoid can cause a short in the engine control module due to corrosion in the solenoid or the wire running from the solenoid to the ECM harness.
  • Intake manifold actuator: The intake manifold actuator helps the intake system provide the correct air flow into the engine cylinder for the proper combustion process to occur. The actuator controls the valve and plates that help proper airflow and its failure greatly affects the performance of the car.
  • Admission valve: Proper operation of the runner valve is necessary so that the required amount of air can enter the cylinder for optimal mixture ratio. If the valve is damaged or not working properly, it can cause rich or lean engine conditions.
  • Intake manifold: The primary function of the intake manifold is to distribute the combustion mixture (or just air in a direct injection engine) to each intake port in the cylinder head. If there are problems in the manifold, code P2004 can be activated.

Is Code P2004 Serious?

For the most part, the biggest danger of this error code is poor performance and fuel efficiency. If your cylinder head has all cylinder valves connected, your engine may not run at all.

The problem with one cylinder may be causing all cylinders to not fire. But you can also see the case that it is only a single cylinder affected, in which the change in performance is low and almost imperceptible.

In any case, the idea is that you carry out the diagnosis immediately and repair it so as not to damage other components.

Can I Drive The Car With The P2004 Code?

Depending on the severity of the symptoms, you may be able to drive the car or you may not be able to drive it at all. If the car starts and you can drive it, do not wait too long to carry out the repair, as it can worsen and leave you stranded.

It is recommended that you carry out the diagnosis and repair as soon as possible.


You may also be interested in Error Code P2006 – Intake manifold slide control stuck in bank 1

Error code P2004 It can be serious if the IMRC throttle plate hardware becomes loose and falls into the engine. This can cause serious engine damage and potentially engine failure.

Therefore, it is important to thoroughly inspect and repair this code immediately. If you let it run, it can become a much more costly failure.

If you want to know other articles similar to Code P2004. Intake Manifold Runner Control Stuck In Open Bank 1 you can visit the category Fault Codes.


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