P2647 Honda Accord Error – Causes, Fixes, and Costs

Many vehicle owners may be intimidated by the P2647 Honda Accord error. This diagnostic trouble code indicates a problem with the Variable Valve Timing and Lift Electronic Control (VTEC) system. In a nutshell, this error indicates a problem with the VTEC/Rocker Arm Oil Pressure Switch. Let’s delve deeper into this subject.

P2647 Honda Accord Error – A Quick View

Causes For P2647 Honda Accord
How to Fix
Insufficient Engine Oil Level
Check oil using a dipstick; top up to recommended level.
Dirty or Degraded Engine Oil
Perform an oil change using factory-recommended oil weight.
Faulty VTEC/Rocker Arm Oil Pressure Switch
Replace the VTEC oil pressure switch.
Open or Shorted VTEC System Wiring
Inspect the wiring harness for damage and repair/replace as necessary.
Poor Electrical Connections in VTEC System
Clean and secure all connectors; replace corroded terminals/pins.
Malfunctioning VTEC Solenoid
Test the solenoid’s operation; replace if faulty.

Possible Causes Of The P2647 Honda Accord

When your Honda Accord displays the P2647 code, it points towards potential issues with the Variable Valve Timing and Lift Electronic Control (VTEC) system. However, several underlying causes can contribute to P2647 Honda Accord error:

  • Engine Oil Irregularities
  • Faulty VTEC/Rocker Arm Oil Pressure Switch
  • Wiring and Electrical Concerns

Engine Oil Irregularities


An insufficient amount of engine oil can hinder the proper functioning of the VTEC system. It’s vital to regularly check and maintain the oil level within the recommended range.


Over time, engine oil can degrade or become contaminated, impacting its efficacy. Old or dirty oil can prevent the VTEC system from operating optimally.


Adequate oil pressure is crucial for the VTEC system. Anomalies in pressure can result in the P2647 Honda Accord code being triggered.

Faulty VTEC/Rocker Arm Oil Pressure Switch

This switch is integral to the VTEC system’s operation. If it malfunctions or fails, it can lead directly to the P2647 error. A diagnostic tool can help pinpoint if this component is the culprit.

Wiring and Electrical Concerns

If the VTEC/Rocker Arm Oil Pressure Switch harness is open or shorted, it interrupts the electrical signals essential for the system’s functioning.

Oxidation, wear and tear, or even minor damages can lead to inferior electrical connections in the VTEC/Rocker Arm Oil Pressure Switch circuit. This can compromise the entire system’s functioning.

How To Fix The P2647 Honda Accord Error?

Upon encountering the P2647 Honda Accord error, take a systematic approach to rectify the issue:

Inspect Engine Oil

  • Utilize the dipstick to ensure the oil level lies between the minimum and maximum markers.
  • If the oil appears dark, gritty, or has an off smell, it’s time for an oil change.
  • Use a manual oil pressure test kit to ensure the pressure is within the vehicle’s specifications.

Visual Inspection

  • Examine the wiring harness related to the honda accord p2647 error. Check for signs of wear, chafing, or breaks. Ensure the connectors are not corroded or damaged.
  • Visually inspect the VTEC solenoid and oil pressure switch for any physical damage or oil leaks.

Replace Faulty Components

If diagnostics point towards a malfunctioning VTEC oil pressure switch, consider its replacement. Always opt for quality parts to ensure longevity and performance.

Tech Notes On Code P2647 Honda Accord

The prominence of engine oil in causing the P2647 Honda Accord error cannot be emphasized enough:

Before contemplating complex repairs or replacements, consider a straightforward engine oil change. Opt for the factory-recommended oil weight.

Honda has issued service bulletins for several models, highlighting this specific error. For instance, the 2004 Honda Accord P2647 has recommendations suggesting the replacement of the VTEC oil pressure switch to resolve the problem.

Diagnosis Cost For P2647 Honda Accord

When your Honda Accord flashes the P2647 error, it’s recommended to seek a professional diagnosis:

Standard Labor Time

Diagnosing the P2647 Honda Accord error typically necessitates about 1.0 hour of labor. This duration is an industry average but can vary based on the technician’s experience and the tools at their disposal.

Variable Labor Costs

Different auto repair shops have varied labor rates. Geographical location, expertise, and overheads play a role in determining these rates. Generally, you can expect charges between $75 and $150 per hour.

Additional Costs

While the diagnosis might point towards minor fixes, such as an oil change, there could be situations where component replacements are needed. Always seek a detailed breakdown of costs before proceeding with repairs.

What Does a Rocker Arm Oil Pressure Switch Do?

The rocker arm oil pressure switch is critical in vehicles equipped with VTEC systems. The hydraulic pressure supplied by the rocker arm control solenoid is used by the VTEC system to adjust valve timing and lift as needed.

The ECM (Engine Control Module) monitors and verifies the oil pressure using the rocker arm oil pressure switch to ensure the proper operation of this system. Essentially, this switch aids in maintaining the precise hydraulic pressure required for VTEC to function properly.

What Is the Code P2647 on a Honda R18?

On a Honda R18 engine, the diagnostic trouble code P2647 is specific to the VTEC oil pressure switch. When there is oil pressure on the rocker side of the VTEC valve but the VTEC command is turned off, this code is triggered.

This usually happens at idle, making it simple to diagnose the issue without having to drive. The P2647 error code frequently indicates a problem with the VTEC system, indicating the need for additional inspection and possibly repair.

What Is the Code P2647 on a 2007 Honda Pilot?

A P2647 trouble code on a 2007 Honda Pilot is typically associated with problems related to dirty or low engine oil. A mechanic should begin by inspecting the engine oil condition and levels. If the problem isn’t caused by oil, the next most common cause is a faulty rocker arm oil control solenoid (VTEC solenoid). This component is critical to the proper operation of the VTEC system.

What Is the Code P2647 on a Honda Engine?

DTC P2647, which stands for “A Rocker Arm Actuator System Stuck On,” is a diagnostic trouble code commonly found in Honda and Acura engines equipped with Variable Valve Timing and Lift Electronic Control (VTEC) systems.

The engine valve lift is controlled by a rocker arm actuator system in these engines. When this system becomes stuck in the “on” position, the P2647 code is triggered. To restore the functionality of the VTEC system and resolve this issue, proper diagnosis and repair are required.


What Is The Primary Cause Of The P2647 Honda Accord Error?

The most common cause is related to engine oil issues. Always ensure you’re using the recommended oil weight.

How Much Does It Cost To Diagnose The P2647 Honda Accord Error?

The average diagnosis time is around 1.0 hour, but costs can range from $75 to $150 per hour based on the repair shop.

Are There Any Specific Honda Models Known For This Error?

Yes, models like the 2004 Honda Accord P2647 have a Factory Service Bulletin recommending the replacement of the VTEC oil pressure switch.


Encountering the P2647 Honda Accord error can be worrisome, but understanding its causes and knowing the steps to address it can make the process smoother. While engine oil issues are a common culprit, always consider a thorough diagnosis, especially if you own models like the 2004 Honda Accord P2647. Regular maintenance and vigilance can go a long way in ensuring your Honda Accord runs smoothly.

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Ammar Masoud

I have had a long and fulfilling career in the automotive industry, primarily with Honda and Acura. With 15 years of experience as a Honda service technician, I became highly skilled in repair and maintenance, gaining a deep understanding of these vehicles. After many years in the automotive field, I decided to embark on a second career in industrial manufacturing. It was a significant change, but I found that the skills I had honed in the automotive industry were incredibly valuable in my new role. In my current position in industrial manufacturing, the demand for quality workmanship and meticulous attention to detail is paramount. Fortunately, these are traits that I have cultivated throughout my years in the automotive industry. I take pride in applying these skills to meet the high standards expected in the manufacturing sector.