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P2004: Intake Manifold Runner Control Stuck Open Bank 1

Automotive troubleshooting can seem intimidating, but modern cars have a great system built in to help with this process. Vehicles equipped with OBD-II, which is nearly all modern vehicles, can spit out an error code, which alerts you to the exact problem a car is facing. You simply need to have the right tool to read the code. If you get an OBD-II scanner error code P2004 problem 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.

What Does P2004 Mean?

If you are like most people, you may not know what the intake manifold is, or what it means for it to be stuck open. What does the code P2004 mean? The intake manifold is the part of the engine that supplies the cylinder head with the mixture of fuel and air. Essentially, this is the part that controls how fuel gets pumped into the part of the engine that combusts fuel to produce power. This system is controlled by the powertrain control module, which means if the actuator is stuck open, it might be a problem with either the intake manifold or the powertrain control module.

There are several ways the process of getting fuel into the cylinders can work. Most commonly, each cylinder has a separately controlled metal flap which limits the air/fuel mixture input. Sometimes, all the metal flaps are connected by a metal bar, which means all the cylinders are synchronized and receive the air/fuel mixture at the same time. Finally, sometimes it is achieved by a vacuum diaphram instead. If this is the case, it will be controlled by an electronic intake manifold solenoid.

What are the Symptoms of P2004

If you suffer from a intake manifold runner control that is stuck open, there are a few symptoms you will probably notice. Chances are that at least one of your cylinders is not firing, which can be quite easy to recognize. The three symptoms this might cause are:

  • Poor engine performance
  • Poor fuel efficiency
  • Sudden engine surges

There are many things that can cause a cylinder not to fire, such as a faulty spark plug. If you realize one of your cylinders is not firing, you cannot assume it is due to the input valve being stuck open.

How to Fix P2004

You are probably wondering, “How do I fix trouble code P2004?” There are many things that might cause this problem, which means you need to determine the cause before you can fix it. Before you start, it may be helpful to research whether your car make and model commonly suffers from this problem. Your car may have a history, which would make diagnosing the specific cause much easier.

If you have nothing to go off of, you should start with the circuitry, which may easily corrode. Check for poor connectors that may have been damaged too. If it does not seem to be an electrical problem. you should then check the sensors which determine whether the valve is open or closed. You can use a digital volt/ohmmeter to test the sensors. If that also turns up nothing, you should check for faulty or damaged components. The rivets that secure the valve may be loose or have fallen off completely or the valve itself may have simply gotten stuck.

The Danger If You Do Nothing

For the most part, the biggest danger of this error code is poor performance and fuel efficiency. If your cylinder head has all the cylinder valves connected, then your engine may not run at all. The problem with one cylinder may be causing all the cylinder not to fire.

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