AutoCodes – Honda – P2651 2008 Honda Accord

P2651 2008 Honda Accord Code - Rocker Arm Oil Pressure Switch 'B' Circuit Low Voltage

Quick Answer

The VTEC system activates rocker arm oil control solenoid B by command from the 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 Low engine oil level, Faulty Rocker Arm Oil Control Solenoid, Faulty EOP (Engine Oil Pressure) sensor. 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: P2651 2008 Honda Accord indicates Rocker Arm Oil Pressure Switch 'B' Circuit Low Voltage.
Common causes: Common causes include Low engine oil level, Faulty Rocker Arm Oil Control Solenoid, Faulty EOP (Engine Oil Pressure) sensor.
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 11,941

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
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P2651 2008 Honda Accord Description

The VTEC system activates rocker arm oil control solenoid B by command from the Powertrain Control Module (PCM), and it charges/discharges the hydraulic circuit of the VTEC mechanism that switches valve timing between Low and High. The PCM monitors oil pressure in the hydraulic circuit of the VTEC mechanism using rocker arm oil pressure switch B downstream of rocker arm oil control solenoid B. If there is a difference between the oil pressure condition in the hydraulic circuit determined by the PCM command and the oil pressure condition determined by the status of rocker arm oil pressure switch B, the system is considered faulty, and a DTC is stored.

OBDII Code P2651 2008 Honda Accord - Rocker Arm Oil Pressure Switch 'B' Circuit Low Voltage - AutoCodes.com — P2651 2008 Honda Accord Code - Rocker Arm Oil Pressure Switch 'B' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2651 2008 Honda Accord?

Low engine oil level
Faulty Rocker Arm Oil Control Solenoid
Faulty EOP (Engine Oil Pressure) sensor
Incorrect oil type used
Engine mechanical condition

How to Fix the DTC P2651 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 does this mean?

Code Tech Notes

The most common problem that can set the P2651 code is the engine oil. Before replacing any parts change the engine oil with the factory recommend oil weight.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2651 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 P2651 2008 Honda Accord code?

Need more information on how to fix the P2651 2008 Honda Accord code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2651 2008 Honda Accord code diagnosed by a professional: Find a repair shop in your area

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 P2651 2008 Honda Accord Code

1. What are the common symptoms of OBDII code P2651 on a 2008 Honda Accord?

- Common symptoms include rough idle, loss of power, poor acceleration, and the illumination of the Check Engine Light.

2. What does the OBDII code P2651 on a 2008 Honda Accord indicate?

- The code P2651 indicates a potential issue with the Rocker Arm Oil Pressure Switch 'B' Circuit having low voltage.

3. What are the possible causes of OBDII code P2651 on a 2008 Honda Accord?

- Possible causes include a faulty rocker arm oil pressure switch, wiring issues, low oil level, oil pressure problems, or a malfunctioning PCM.

4. How can I diagnose the cause of OBDII code P2651 on my 2008 Honda Accord?

- A thorough diagnostic process involves checking the rocker arm oil pressure switch, inspecting the wiring for damage, verifying oil levels, and testing oil pressure.

5. Can I continue driving my 2008 Honda Accord with OBDII code P2651?

- It is not recommended to drive your vehicle with the code P2651 as it can lead to engine damage and further issues if left unresolved.

6. How much does it typically cost to repair OBDII code P2651 on a 2008 Honda Accord?

- The cost of repairs for code P2651 can vary depending on the exact cause, but it may range from $100 to $300 for parts and labor.

7. Is it possible to reset the OBDII code P2651 on a 2008 Honda Accord without fixing the underlying issue?

- Resetting the code without addressing the root cause may temporarily turn off the Check Engine Light, but the issue will likely reoccur.

8. Can a DIY enthusiast repair OBDII code P2651 on a 2008 Honda Accord?

- Some aspects of diagnosing and repairing code P2651 can be tackled by DIY enthusiasts with the right tools and knowledge, but complex issues may require professional help.

9. How long does it typically take to repair OBDII code P2651 on a 2008 Honda Accord?

- The repair time can vary based on the exact cause of the issue, but it may take anywhere from 1 to 3 hours to diagnose and fix the problem.

10. Are there any preventive measures to avoid encountering OBDII code P2651 on a 2008 Honda Accord in the future?

- Regularly checking and maintaining oil levels, monitoring engine performance, and addressing any issues promptly can help prevent the occurrence of code P2651.