P2647 Honda Odyssey: Understanding the Cause and How to Fix It

Having a P2647 Honda Odyssey code can be frustrating, especially if it’s your first time. This code indicates a problem with your car’s “A” rocker arm actuator system and your car may become sluggish, have misfires, or even a drop in acceleration and overall performance.

Reading further, you will learn more about the “A” rocker arm actuator system, the potential causes of this code, symptoms you may experience, how to diagnose it, and how to fix it. Of course, the solution you employ to eliminate this code depends on the cause, so it is important to understand the cause of this code to determine a suitable solution. 

What is an “A” rocker arm actuator system?

The rocker arm actuator system is part of your car’s engine control module (ECM) system and it is an oil pressure switch that regulates the flow of oil to the engine cylinder head by the opening and closing of engine valves. The rocker's arms control the timing and duration of the opening and closing of the engine valve and it is controlled by the actuator which receives instructions from the ECM.

The “A” refers to an electric solenoid which is a type of actuator used to control the whole process of this component. Knowing the function of this car component, a P2647 code indicates a malfunction with this system and it indicates that it can no longer properly control the flow of oil to the cylinder. 

Causes of the P2647 code on Honda Odyssey

There are several potential reasons why this code is triggered on your vehicle and they all relate to your car’s power train. 

Engine timing out of specification

The engine timing is responsible for opening and closing the engine valves at the right time and for the appropriate length. When this timing is out of specification, the valves are not controlled at the right time and they may be opened or closed for too long or a shorter time. This can cause misfires and result in engine damage if not attended to immediately. Poor fuel economy is another behavior you will notice if this is the problem with your rocker arm actuator. 

Faulty oil control valve or restricted orifice


Your oil control valve is responsible for sending oil to various engine components for lubrication and other functionalities. When the valve is faulty, it won’t be able to send oil to the engine cylinder for cooling and lubrication purposes. This problem can lead to low oil pressure, more oil consumption, engine performance issues, and ultimately engine damage.

Damaged wiring

If your car has wiring and connectors that are linked to the oil valve, these components getting damaged can lead trigger the P2647 code. The wiring or connectors that can be linked to the oil valve plays an important role in regulating its timing and interval, any damage will mean that your oil valve won’t do its job properly and affect your engine and car’s overall performance. 

No engine oil or low oil pressure

Engine oil is needed to lubricate and cool the cylinders and other engine components. When it is absent, a vital component of your car engine system gets damaged due to wear by friction or overheating. The right engine pressure on the other hand is necessary to send oil to these components at the right time and speed. When the oil pressure is low, your cylinder won’t get sufficient oil and this can cause damage that triggers the code on your Honda Odyssey. 

Low oil pressure can lead to engine damage, which makes it an urgent problem you need to attend to. 

A faulty power train module

The power train control module (PCM) is popularly known as the electronic control module (ECM) and it is responsible for regulating the activities of your car’s powertrain. The powertrain includes the engine and transmission. The ECM receives the information needed to adjust several functions from sensors located in various places on your car, and it plays a vital role in working with the arm rocker actuator system.

With the ECM malfunctioning, the actuator won’t receive the right instructions needed to guide the rocker arm to open and close valves, in serious cases, the actuator won’t receive any information at all. This is bad for your car’s well-being seeing as the ECM controls most automated activities and this can lead to long-term damage if not handled immediately. 

Symptoms of P2647 code

There are various symptoms associated with the P2647 Honda Odysseycode and this section explores the symptoms that are always present for this malfunction, irrespective of its cause.

Engine hesitation

In various scenarios where your rocket arm actuator fails to deliver oil to your car cylinder, wear occurs and this makes your engine fail temporarily while driving. When this happens, you will experience delayed acceleration or your acceleration will stumble when you hit on your gas pedal.

Overall decreased engine performance

With your engine overheating and wearing due to friction, it will not be in its best condition to drive your car properly, your engine is experiencing a decrease in its performance. You will observe this by an overall decrease in your car’s performance in terms of acceleration and smooth movement. If this persists, it can lead to long-term engine damage. 

Check engine light

The check engine light is always triggered when any component malfunctions in your car. This is an orange or amber light that will be visible on your car’s dashboard. Alongside other symptoms, this indicator should alert you of the presence of this code in your Honda Odyssey. 


When your cylinder fails to ignite the fuel mixture, your car moves roughly or you may experience a loss of power. Sometimes, increased emissions from your exhaust are a sign of an engine misfire. 

How to diagnose P2647 in Honda Odyssey


The first thing you need to do after observing all these symptoms is to check your car’s oil level and the low oil pressure light to eliminate the possibility of one of these issues being the cause of this code. Using the details provided by your car’s manufacturer, you can also check to see if your engine timing is correct and corresponds with the valve functionality. 

If you detect no problem after taking the tests above, you want to use an OBD scanner to evaluate your car and make a diagnosis. The OBD port of your Honda Odyssey is located beneath the dashboard on the driver's side. Connecting your OBD to this port to give you a diagnosis of any code present. 

How to fix the P2647 code on Honda Odyssey

To fix this issue on your car, it is important to identify the cause to know the corresponding solution. Here are some repairs or actions you can take to fix this 

    • Change or add more engine oil to your car
    • Replace the timing belt or chain and other components related to the engine timing
      • Replace or fix the oil control valves
        • Replace or fix wiring or connectors related to your car’s oil valve
          • Getting a new powertrain control module


            You can diagnose your Honda Odyssey with different codes and the P2647 is is one of them. However, you should take this code seriously as it indicates a problem with your car’s “A” rocket arm actuator system which is responsible for regulating the flow of oil to your car’s cylinder.

            Ignoring this problem can lead to your engine overheating and wearing down due to friction, and after reading this article, you know the potential cause of this problem is related to your car’s powertrain. By observing any symptoms, you should be able to get a hint that the P2647 Honda Odyssey code has been triggered and you can identify causes and solutions with this.