AutoCodes – Honda – P2646 2008 Honda Accord

P2646 2008 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 2008 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 16,034

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2008 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 2008 Honda Accord - Rocker Arm Oil Pressure Switch Circuit Low Voltage - AutoCodes.com — P2646 2008 Honda Accord Code - Rocker Arm Oil Pressure Switch Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2646 2008 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 2008 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 2008 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 2008 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 2008 Honda Accord Code

1. What are the common symptoms of OBDII code P2646 in a 2008 Honda Accord?

- Common symptoms include rough idle, loss of power, and the Check Engine Light illuminating on the dashboard.

2. What does the OBDII code P2646 for a 2008 Honda Accord indicate?

- The code P2646 indicates a low voltage condition in the rocker arm oil pressure switch circuit.

3. What are the possible causes of the P2646 code in a 2008 Honda Accord?

- Possible causes include a faulty rocker arm oil pressure switch, low engine oil level, dirty engine oil, or wiring/connectivity issues.

4. How can I diagnose the rocker arm oil pressure switch circuit low voltage issue in my 2008 Honda Accord?

- Diagnosing the issue involves checking the oil level, inspecting the oil pressure switch, testing the switch's voltage, and examining the wiring for any damage.

5. Can I drive my 2008 Honda Accord with the P2646 code present?

- It is not recommended to drive the vehicle with the P2646 code as it can lead to engine performance issues and potential damage if left unaddressed.

6. How can I repair the rocker arm oil pressure switch circuit low voltage problem in my 2008 Honda Accord?

- Repair options may include replacing the rocker arm oil pressure switch, topping up engine oil, cleaning the oil passages, or repairing any damaged wiring.

7. Will resetting the Check Engine Light resolve the P2646 code in my 2008 Honda Accord?

- Simply resetting the Check Engine Light will not fix the underlying issue causing the P2646 code. Proper diagnostics and repairs are necessary.

8. Is the rocker arm oil pressure switch something I can replace myself in a 2008 Honda Accord?

- Replacing the rocker arm oil pressure switch is a relatively straightforward task that can be done by a DIY enthusiast with the right tools and knowledge.

9. How much does it typically cost to repair the P2646 code in a 2008 Honda Accord at a mechanic?

- The cost of repair can vary depending on the exact cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

10. Can a malfunctioning rocker arm oil pressure switch affect the overall performance of a 2008 Honda Accord?

- Yes, a malfunctioning rocker arm oil pressure switch can lead to poor engine performance, decreased fuel efficiency, and potential damage to engine components if not addressed promptly.