AutoCodes – Honda – P2651 2010 Honda Accord

P2651 2010 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 2010 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 6,977

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 2010 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 2010 Honda Accord - Rocker Arm Oil Pressure Switch 'B' Circuit Low Voltage - AutoCodes.com — P2651 2010 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 2010 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 2010 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 2010 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 2010 Honda Accord code?

Need more information on how to fix the P2651 2010 Honda Accord code? Get Access to Factory Service Manuals

Need Help with the 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 P2651 2010 Honda Accord Code

1. What are the common symptoms of OBDII code P2651 in a 2010 Honda Accord?

- Common symptoms include the illumination of the Check Engine light, rough idling, decreased engine performance, and potential issues with variable valve timing.

2. What does the OBDII code P2651 on a 2010 Honda Accord indicate?

- OBDII code P2651 indicates a problem with the Rocker Arm Oil Pressure Switch 'B' Circuit, specifically low voltage detected.

3. What are the possible causes of OBDII code P2651 in a 2010 Honda Accord?

- Possible causes include a faulty rocker arm oil pressure switch, damaged wiring or connectors in the circuit, low engine oil level, or issues with the engine control module.

4. How can I diagnose the Rocker Arm Oil Pressure Switch 'B' Circuit low voltage issue in my 2010 Honda Accord?

- Diagnosis typically involves checking the oil level, inspecting the wiring and connectors for any damage, testing the rocker arm oil pressure switch, and scanning the vehicle's computer for related fault codes.

5. Can I continue driving my 2010 Honda Accord with OBDII code P2651 present?

- It is not recommended to drive with this code present, as it can lead to potential engine performance issues and further damage if left unresolved.

6. How do I repair OBDII code P2651 on my 2010 Honda Accord?

- Repair steps may involve replacing the rocker arm oil pressure switch, repairing any damaged wiring or connectors, ensuring the engine oil level is correct, and clearing the fault code from the vehicle's computer.

7. Is it safe to clear the OBDII code P2651 in my 2010 Honda Accord without fixing the underlying issue?

- Clearing the code without addressing the root cause is not recommended, as the problem may persist and potentially lead to more severe issues in the future.

8. Can a DIY enthusiast fix OBDII code P2651 in a 2010 Honda Accord?

- Depending on their skill level, a DIY enthusiast may be able to address this code by following repair guides, but consulting a professional mechanic is advisable for accurate diagnosis and proper repair.

9. How much does it typically cost to repair OBDII code P2651 in a 2010 Honda Accord?

- The cost of repair can vary based on the exact cause of the issue, parts needed for replacement, and labor charges. It's recommended to obtain quotes from reputable repair shops for an accurate estimate.

10. Are there any preventive maintenance tips to avoid OBDII code P2651 in a 2010 Honda Accord?

- Regularly checking and maintaining proper engine oil levels, ensuring timely oil changes, and inspecting the rocker arm oil pressure switch during routine vehicle inspections can help prevent this code from appearing.