p2004 code

P2004 Code – What Is It And How To Fix It

It can seem hard to troubleshoot problems with your vehicle. However, if it is a modern car, then chances are it comes with an inbuilt OBD-II system. This allows it to provide an error code such as the P2004 code which tells you exactly what the problem is with your car.

The P2004 code error means that there is a problem with the intake manifold. It tells you that the runner control actuator of the manifold is open. In this post, we take a closer look at the P2004 intake manifold runner control stuck open bank 1, what it means and how to fix it.

You can use the table of contents below for easier navigation.

Code P2004

To best understand the P2004 error, let’s first take a look at the intake manifold. This is a component of the engine that is responsible for providing the cylinder head with the fuel-air mixture. Simply put, it feeds the part of your vehicle’s engine that handles fuel-air mixture combustion.

The intake manifold is in turn controlled through the powertrain control module. When the IMRC actuators are stuck open, this means that the problem could be with the powertrain control modules or the intake manifolds.

The amount of fuel-air mixture entering the cylinders does so in two main ways. The first is through a metal flap. The second method is through a vacuum diaphragm. In the latter instance, the fuel-air mixture will be controlled via the electronic intake manifold solenoid.

Simply put, the actuator that controls the runners of the intake manifold is in the open position. This explains the reading P2004 intake manifold runner control stuck open bank 1. This then means that the runners cannot be controlled as desired as they are in a fixed position.

Since the fair is not flowing into the cylinders as desired, the engine’s performance is affected resulting in less efficiency, less power, and slow acceleration.

What Causes The P2004 Code?

Different vehicles feature different designs for the intake manifold runner control system so the root causes of the code P2004 may vary depending on the model such as the P2004 Ford.

That said, there are some key factors that will cause a code P2004 error across the board. These are

  • Vacuum hoses that are broken or disconnected.
  • Vacuum control solenoid that is obstructed.
  • IMRC solenoid that is damaged or faulty
  • IMRC wiring that is damaged, broken, or flaring
  • An IMRC connector that is damaged or corroded
  • IMRC plates that are broken or faulty

How Serious Is The P2004 Code

Experts consider the P2004 to be moderately serious. This is based on its overall effects on the performance and drivability of the vehicle. For instance, a vehicle will often idle or surge erratically.

Fuel efficiency will also be affected causing the vehicle to consume more fuel while providing significantly less power.

Therefore, it is important that the P2004 code is quickly addressed and the root cause resolved. It is possible to fix the issue with the intake manifold runner control yourself. However, if you are not up to the task, you can seek the services of a qualified mechanic. Keep in mind that this will only add to the overall costs.

P2004 Intake Manifold Runner Control Stuck Open Bank 1

If the IMRC actuators are open, there are a few telltale signs. First off, there is a chance that one of the car’s cylinders isn’t working. It is usually the #1 cylinder thus the error message P2004 intake manifold runner control stuck open bank 1.

p2004 code 1

This is not too difficult to recognize.

Some of the symptoms of bad intake manifold runner control include

  • Bad fuel efficiency
  • Poor performance
  • Engine surges that are quite sudden
  • The check engine light will turn on or flashes

Note, however, that there could be many causes of the cylinders is failing to fire. For instance, the spark plug may not be working. Just don’t assume a P2004 error just because one cylinder isn’t firing.

We shall take a closer look at the symptoms of a bad IMRC later on.

Intake Manifold Runner Control Stuck Open

If you notice any of the above symptoms of bad intake manifold runner control, you need to quickly take your vehicle in for diagnosis and repair. The mechanic will start by using an OBD-II scanner. This allows him to access freeze frame data from which they can read the error codes.

Next, your mechanic will perform a thorough visual check of the wiring system and look out for shorts, frays, or any wire breaks. In case of any of these, they’ll repair them.

Your mechanic will then visually inspect the IMRC solenoid looking out for any signs of corrosion and damage. In case they find such, they’ll move on to repair them.

Your mechanic would then inspect the hoses and vacuum lines. In case of any damage, the mechanic will repair or if need be make a replacement.

Next, your mechanic will also do an inspection of the IMRC valve plates to see if there are any breaks or disconnections.

They’ll also do an inspection of the EGR valve and check if there is a buildup of carbon. It is important to ensure that there is no buildup as it could reach the IMRC solenoid and cause damage.

Finally, the mechanic will clear the error codes and will run the test again to see if the P2004 error is generated again.

Finally, the mechanic will use the scanning tool to open as well as close the IMRC solenoid. If there is no response, then the solenoid is damaged and will need replacement.


IMRC stands for Intake Manifold Runner Control. It is a system made up of motorized IMRC actuators. It also contains an attaching linkage that caters to each housing. This linkage connects to the plate levers of the housing butterfly.

Each housing on the IMRC has two air passages for every cylinder.

The main role of the intake manifold runner control is to prevent the unequal distribution of air to each cylinder. Simply put, it ensures that all cylinders receive an equal amount of air when the throttle is wide open.

The IMRC is controlled by the ECU (Engine Control Unit) through the solenoid valves.

IMRC Valve

Early designs of the intake manifold runner control had a fixed width and length. Now vehicles are coming with a variable intake manifold. The manifold runners have varying lengths thanks to the IMRC valve.

p2004 code 2

There is a lot of confusion about the IMRC valve. Some sources will refer to them as IMRC actuators while other sources refer to the solenoid.

The intake manifold runner control valve is neither of these things. The IMRC valve is the section that controls the flaps inside the intake manifold.

Fixing the P2004 error will depend on your vehicle model or make such as the P2004 Ford we will look at later on. Your car might come with a single intake manifold runner control valve or it could come with multiple valves.

IMRC Actuators

The IMRC actuator is an electronic unit that is connected to the intake manifold. Its role is to control the IMRC valve.

The IMRC actuators, therefore, send the signals to the valves, causing them to shift resulting in varying lengths of the manifold passages.

The longer the manifold the more the torque and the better the fuel economy. On the other hand, the shorter the manifold the more the horsepower owing to the tumbling effects of the air.

Unclogging Or Repairing The Intake Manifold Runner Bank 1

The intake manifold supplies air to the cylinders and is no doubt a hugely important part of your vehicle. However, it can get clogged up over time. The result is a car that malfunctions and offers reduced performance.

If you want to ensure that your car is performing to its full capacity, it is important that you ensure that the intake manifold is clean. You don’t need to be an expert for unclogging or repairing the intake manifold runner bank 1. But you will need to have a basic understanding of how it works.

These are the steps for unclogging or repairing the intake manifold runner bank 1.

Step 1: Take Out The IMRC

Make sure that you have disconnected the car’s battery before you can take out the intake manifold runner control cover. This will keep you safe from electrocution. Having done this, open the top half of the IMRC using a screwdriver.

You will also need to use a torque wrench to take out the 10mm bolt.

Step 2: Take Out The Intake Manifold Tubing

This is the air tubing connected to the manifold. Take it out gently. You will also need to remove the other tubing that connects to the manifold. Make sure you understand how everything sits as you will need to reinstall the IMRC and the tubing.

Step 3: Take Out The IMRC Body

Now that the intake manifold runner control is not connected to anything, you can now remove it. Start by loosening the top. As you do so, be careful not to damage the gasket that sits at the intake manifold’s bottom.

Step 4: Use A Throttle Body Cleaner To Clean The IMCR

Open the throttle body cleaner (and want to learn how to clean throttle body) and apply a decent amount on a rug then use this for unclogging or repairing the intake manifold runner bank 1.

If there is stubborn dirt then use a nylon brush to scrub it away making sure that you access every nook and cranny. As for the small holes on the IMCR, you can use a wire brush for unclogging or repairing the intake manifold runner bank 1.

Step 5. Reinstall All Input Manifold Parts

Now it’s time to put everything back together. You can do this by retracing your steps backward. One thing to make sure is that the bolt for the intake manifold runner control is tight before you reconnect the car battery.

Symptoms Of Bad Intake Manifold Runner Control

The intake manifold runner control is an important part of your cars engines performance. Damage to the manifold can cause a ripple effect through the engine expanding the reach of the damage. This is why it is critical to quickly solve any issues that arise with the IMRC.

p2004 code 3

Symptoms of bad intake manifold runner control to watch out for include:

1. Hard Start Engine Caused By P2004 Code

If there is any damage or fault with the IMCR, the first way that this will manifest is the engine becoming difficult to start. Keep in mind that the IMCR will normally position the valve correctly as soon as the car engine starts.

If the valve is not in the proper position, this leads to difficulty in getting the engine to start. Often you will find that the engine needs more cranks for it to start.

2. Misfire In The Engine Due To P2004 Code

You will also notice that the car’s performance has gone down.  A faulty intake manifold runner control will cause engine mishaps and performance issues such as low power, low acceleration, stalling as well as misfires.

3. Check Engine Line Turns On Due To P2004 Code

If you see that the check engine light has turned on, then there is a chance that the intake manifold runner control could have a problem. Keep in mind that there are also a whole host of other issues that could turn on the check engine light.

OBD intake manifold runner control actuator problems diagnose troubleshooting

The best thing is to scan the computer to be able to read the trouble codes. In this case, you would be looking out for a code P2004 as well as symptoms of bad intake manifold runner control.

P2004 Jeep Patriot

If you drive a Jeep Patriot and you got the P2004 code, then this could be due to several reasons.

First, it could be that the intake manifold runner control is sticking or binding open.

You could also have a damaged manifold valve or one that is faulty.

Thirdly it’s possible that the harness to the manifold flow valve has disconnected or been shortened.

Finally, the P2004 code on your Jeep Patriot could be a result of a circuit or an electrical connection that is faulty.

To fix the problem inspect the vehicle visually for any issues with the wiring, connectors, or connector pins that have incurred damage such as breaking, or corroding. You may also want to check for any signs of damage around the intake manifold.

Remember to disconnect the battery before sorting the issue. Once you have taken care of the problem then you can reconnect the battery. Reconnecting clears the previous error from the computer and tries to set it. This will also help clear the check engine light.

P2004 Ford Focus

If you drive a Ford Focus and you get code P2004 code, then you may want to start by taking out the intake manifold runner control. Check the flaps and ensure that they are working correctly.

Secondly, check to see that the actuator is working correctly to fix the P2004 Ford. Also, check the solenoid to ensure that it is actuating and doing its job properly. If not and has incurred damage, then this could be the cause of the P2004 error code.

Thirdly check to see if there is a vacuum leak in the intake manifold runner control. If you find out that there is then chances are you have broken hoses. Inspect each to see which one that has incurred damage and replace it.

P2004 Nissan Rogue

When dealing with a Nissan Rogue, the P2004 error message shows that the IMRC actuator is open. It is the same as the P2004 Ford. Note that bank 1 means the engine side where the #1 cylinder is located. Bank 2 means the engine side where the #2 cylinder is located.

Sometimes a computer issue could give the P2004 code. Start by clearing the code and see if it comes back. If you get the code again then you will need to search for potential issues with your IMRC. Normally a keen eye will be able to detect the issue.

Check if there is a problem with the wiring issues with the intake manifold runner control. You may also want to check the actuator and find out of it is working. Moreover, you may also want to ensure that the manifold gasket is not damaged.

Once identified, have the issue fixed and reinstall the manifold.

P2004 Nissan Altima

If you get a code P2004 from your Nissan Altima, similar to the P2004 Ford we looked at above, then it is likely that the intake manifold runner control is open and will not close. You may also see bank 1 with the error message i.e. P2004 intake manifold runner control stuck open bank 1. This represents the cylinder.

OBD intake manifold runner control actuator problems diagnose troubleshooting

So if you see bank 1 then this indicates #1 cylinder.  That said, the P2004 is a general message so it would indicate a problem with the intake manifold that is similar to other vehicles.

To diagnose the error message start by inspecting the wiring, check that the actuator is working correctly, check the linkage and ensure it is working correctly, or check for a vacuum leak.

A P2004 message would coincide with your Nissan Altima driving a bit rougher even though it will not break down. It is best to fix the problem quickly as leaving it for a long time will cause other issues.

P2004 Mercedes

When you get a P2004 error code with your Mercedes Benz, then there is a likelihood that there is a problem with the intake manifold air lever.

In this case, changing the older manifold air lever and replacing it with one made out of aluminum with generally fix the issue. This is because often the older parts have depreciated.

You can get a high-strength aluminum air flap on Amazon.

Facts: P2004 Code and IMRC Diagnostic and Inspection

  • The P2004 code is a generic powertrain code that signals the Bank 1 Intake Manifold Runner Control (IMRC) is stuck in the open position.
  • Bank 1 and Bank 2 refer to the side of the engine where cylinders 1 and 2 are located, respectively.
  • The IMRC enhances engine performance by optimizing the air/fuel mixture in the engine and reducing harmful emissions while increasing fuel economy.
  • Symptoms of a P2004 code include decreased engine performance, a reduction in fuel economy, engine surging or sputtering, and the Check Engine Light turning on.
  • Common causes of the P2004 code include a faulty IMRC actuator solenoid, shorted or frayed wiring, a faulty MAP sensor, and debris or damaged vacuum lines.
  • The P2004 code can lead to various performance and driveability issues and potentially severe engine damage, so it should be taken seriously and inspected by a qualified technician.
  • Driving with the code triggered for an extended period is not recommended due to the negative impact on engine performance and the potential for severe engine damage.
  • Diagnosing a P2004 code issue correctly requires the use of multiple tools, including an OBD-II diagnostic scanner and a digital volt/ohmmeter (DVOM), and should be left to qualified technicians.
  • Inspecting a P2004 code issue requires a thorough inspection of the vehicle’s IMRC system, including connectors, wiring, and components, and is also better left to qualified technicians.
  • Late-model vehicles utilize an IMRC to improve engine performance, which changes the intake manifold runner length through electrically-controlled butterfly valves, and is controlled by the PCM utilizing inputs from the Throttle Position Sensor (TP) and Crankshaft Position Sensor (CKP).

Frequently Asked Questions On P2004 Code

Here are some popular FAQs:

P2004 Code How To Fix

To fix a P2004 error code such as the P2004 Ford we saw above, start by reading any accompanying codes. Diagnose each and fix. Secondly, do a visual inspection of all the vacuum hoses and check for breakage that could cause leaks. Third, inspect the IMRC wiring and check for breaks, pinched wires as well as breakages. Also, check the IMRC linkage and plates. Fix any issues that you may find such as unclogging or repairing the intake manifold runner bank 1.

What Does Code P2004 Mean

If you see a P2004 error or P2004 intake manifold runner control stuck open bank 1, then this tells you that the actuator that is responsible for controlling the runners of the intake manifold is stuck and the IMRC is in the open position. As a result, the car’s engine performance will go down resulting in less power, slow acceleration, and overall inefficiency.

How To Test Intake Manifold Runner Control Valve

Simply connect the computer to the programming device and connect it to the OBD-II port. You can find this port on the driver’s side under the dashboard. Next, put the car keys in the ignition and turn it on but don’t ignite the vehicle. Press VIN and press AutoDetect. This will help the computer read the VIN number of the vehicle. After you confirm the process, find intake manifold runner control and select this. You will now be able to control the runner control valve by pressing the on and off buttons on the computer. If you can hear a clicking sound every time you click on or off, then this means that the runner control valve is working.

How Do I Know If My Intake Manifold Runner Control Is Bad

Common symptoms of bad intake manifold runner control especially with the intake manifold runner control valve are a loss of engine power and acceleration, engine misfires, check engine light turning on or blinking, and the engine has a hard start. Basically, you should notice an overall loss in performance and reduced fuel efficiency.

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