AutoCodes – Honda – P2646 2009 Honda Accord

P2646 2009 Honda Accord Code - Rocker Arm Oil Pressure Switch Circuit Low Voltage

Quick Answer

The Variable Valve Timing and Lift Electronic Control (VTEC) system activates the Rocker Arm Oil Control Solenoid (VTEC Solenoid Valve) by command from the Engine Control Module (ECM) / Powertrain Control Module (PCM), and it charges/discharges the hydraulic circuit of the VTEC mechanism that switches valve timing between Low and High. Common causes include Check engine oil level, oil condition and pressure, Faulty Variable Valve Timing and Lift Electronic Control (VTEC) / Rocker Arm Oil Pressure Switch, VTEC/Rocker Arm Oil Pressure Switch harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2646 2009 Honda Accord indicates Rocker Arm Oil Pressure Switch Circuit Low Voltage.
Common causes: Common causes include Check engine oil level, oil condition and pressure, Faulty Variable Valve Timing and Lift Electronic Control (VTEC) / Rocker Arm Oil Pressure Switch, VTEC/Rocker Arm Oil Pressure Switch harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 8,018

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 24, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2646 2009 Honda Accord Description

The Variable Valve Timing and Lift Electronic Control (VTEC) system activates the Rocker Arm Oil Control Solenoid (VTEC Solenoid Valve) by command from the Engine Control Module (ECM) / Powertrain Control Module (PCM), and it charges/discharges the hydraulic circuit of the VTEC mechanism that switches valve timing between Low and High. The ECM/PCM monitors oil pressure in the hydraulic circuit of the VTEC mechanism using the rocker arm oil pressure switch (VTEC oil pressure switch) downstream of the rocker arm oil control solenoid (VTEC solenoid valve). If there is a difference between the oil pressure condition in the hydraulic circuit that is determined by the ECM/PCM command and the oil pressure condition that is determined by the status of the rocker arm oil pressure switch (VTEC oil pressure switch), the system is considered faulty, and the Diagnostic Trouble Code (DTC) is stored.

OBDII Code P2646 2009 Honda Accord - Rocker Arm Oil Pressure Switch Circuit Low Voltage - AutoCodes.com — P2646 2009 Honda Accord Code - Rocker Arm Oil Pressure Switch Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2646 2009 Honda Accord?

Check engine oil level, oil condition and pressure
Faulty Variable Valve Timing and Lift Electronic Control (VTEC) / Rocker Arm Oil Pressure Switch
VTEC/Rocker Arm Oil Pressure Switch harness is open or shorted
VTEC/Rocker Arm Oil Pressure Switch circuit poor electrical connection

How to Fix the DTC P2646 2009 Honda Accord?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2646 2009 Honda Accord code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2646 2009 Honda Accord code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2646 2009 Honda Accord Code

1. What are the common symptoms of OBDII code P2646 on a 2009 Honda Accord?

- Common symptoms include rough idling, poor engine performance, reduced fuel efficiency, and the Check Engine light illuminated on the dashboard.

2. What causes the OBDII code P2646 on a 2009 Honda Accord?

- The code P2646 is typically triggered by a faulty rocker arm oil pressure switch or low oil pressure in the engine.

3. How serious is the OBDII code P2646 on a 2009 Honda Accord?

- While the vehicle may still be drivable with this code, it is important to address it promptly to prevent potential engine damage.

4. Can I continue driving my 2009 Honda Accord with the OBDII code P2646?

- It is not recommended to continue driving the vehicle with this code unresolved, as it can lead to further engine issues and potential breakdowns.

5. How can I diagnose the OBDII code P2646 on my 2009 Honda Accord?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific code, checking the oil level and pressure, and inspecting the rocker arm oil pressure switch for any visible damage.

6. What is the repair process for OBDII code P2646 on a 2009 Honda Accord?

- The repair process may involve replacing the faulty rocker arm oil pressure switch, checking and replenishing the engine oil if necessary, and clearing the code using an OBDII scanner.

7. Can I fix the OBDII code P2646 on a 2009 Honda Accord myself?

- If you have the necessary tools, knowledge, and experience, you may be able to replace the rocker arm oil pressure switch yourself. However, it is recommended to consult a professional mechanic for proper diagnosis and repair.

8. How much does it cost to repair the OBDII code P2646 on a 2009 Honda Accord?

- The cost of repairing this code can vary depending on the cause of the issue, labor rates in your area, and whether you choose to do the repair yourself or take it to a mechanic.

9. Are there any preventive measures to avoid the OBDII code P2646 on a 2009 Honda Accord?

- Regular maintenance, including oil changes at recommended intervals, can help prevent issues with the rocker arm oil pressure switch and reduce the likelihood of triggering this code.

10. What should I do if the OBDII code P2646 keeps coming back on my 2009 Honda Accord?

- If the code keeps reoccurring after repair, it may indicate a persistent issue with the rocker arm oil pressure switch or oil pressure system, and further diagnosis by a professional technician is recommended.