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

Quick Answer

The P2651 diagnostic trouble code for Honda vehicles indicates an issue with the Rocker Arm Oil Pressure Switch 'B' Circuit, specifically detecting low voltage. Common causes include Faulty Rocker Arm Oil Pressure Switch 'B', Wiring or connector issues in the circuit, ECM malfunction. 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 Honda indicates Rocker Arm Oil Pressure Switch 'B' Circuit Low Voltage.
Common causes
Common causes include Faulty Rocker Arm Oil Pressure Switch 'B', Wiring or connector issues in the circuit, ECM malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P2651 Honda Description

The P2651 diagnostic trouble code for Honda vehicles indicates an issue with the Rocker Arm Oil Pressure Switch 'B' Circuit, specifically detecting low voltage. In vehicles equipped with Variable Valve Timing and Lift Electronic Control (VTEC) systems, this switch plays a crucial role in monitoring oil pressure and providing feedback to the engine control module (ECM).

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

Common Causes of P2651 Honda

  1. Faulty Rocker Arm Oil Pressure Switch 'B'
  2. Wiring or connector issues in the circuit
  3. ECM malfunction
  4. Low engine oil level or pressure
  5. Engine overheating causing oil breakdown

Symptoms of P2651 Honda

  1. Illuminated check engine light on the dashboard
  2. Engine running rough or misfiring
  3. Reduced engine power or acceleration
  4. Decreased fuel efficiency
  5. VTEC system not engaging as expected

How to Fix P2651 Honda

  1. Begin by connecting a diagnostic scanner to retrieve the fault code and confirm the P2651 diagnosis.
  2. Inspect the wiring and connectors related to the Rocker Arm Oil Pressure Switch 'B' Circuit for any damage or corrosion.
  3. Test the Rocker Arm Oil Pressure Switch 'B' for proper functionality using a multimeter.
  4. If the switch is faulty, replace it with a new OEM part and ensure proper installation.
  5. Clear the fault code from the ECM memory and perform a test drive to verify that the issue has been resolved.

Cost to Fix P2651 Honda

The cost of repairing a P2651 code on a Honda vehicle can vary depending on the specific model and year. Typically, the price for parts such as a Rocker Arm Oil Pressure Switch 'B' can range from $50 to $100. Labor costs at an auto repair shop may add an additional $100 to $200, depending on the hourly rates in your area. Overall, you can expect the total repair cost to be in the range of $150 to $300, but it's advisable to obtain a personalized quote from a trusted mechanic or dealership.

What does this mean?

Tech Notes for P2651 Honda

The most common problem that can set the P2652 code is the engine oil. Before replacing any parts change the engine oil with the factory recommend oil weight.

There is a Factory Service Bulletin for the following Honda Models

2003-2012 Honda Accord L4
2002-2005 Honda Civic Si
2002-2009 Honda CR-V
2011 Honda CR-Z
2003-2011 Honda Element
2007-2011 Honda Fit

The factory bulletin suggests that replacing the VTEC oil pressure switch (P/N 37250-PNE-G01, H/C 6737217) take care of the problem.

When is the Code Detected?

When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the Powertrain Control Module (PCM) memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Need more information about the P2651 Honda code?

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

Need Help with the Code?

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

Information for Specific Honda Models

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 Honda Code

1. What are common symptoms of OBDII code P2651 in a Honda related to the Rocker Arm Oil Pressure Switch 'B' Circuit Low Voltage?

The common symptoms include rough idling, poor engine performance, and the illumination of the check engine light on the dashboard.

2. What are the possible causes of OBDII code P2651 in a Honda?

The code P2651 in a Honda is typically caused by a faulty rocker arm oil pressure switch, low engine oil level, wiring issues, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose the Rocker Arm Oil Pressure Switch 'B' Circuit Low Voltage issue in my Honda?

To diagnose the issue, you can use an OBDII scanner to retrieve the trouble code P2651. Additionally, checking the oil level, inspecting the wiring connections, and testing the rocker arm oil pressure switch can help pinpoint the problem.

4. What is the recommended repair for OBDII code P2651 in a Honda?

The recommended repair for OBDII code P2651 is to replace the faulty rocker arm oil pressure switch. Ensure the engine oil level is adequate, and check for any damaged wiring that may need repair.

5. Can I drive my Honda with OBDII code P2651 present?

It is not recommended to drive your Honda with OBDII code P2651 present, as it can lead to further engine damage and poor performance. It's best to address the issue promptly to prevent any complications.

6. How much does it cost to repair OBDII code P2651 in a Honda at a mechanic?

The cost of repairing OBDII code P2651 in a Honda can vary depending on the labor rates and parts costs. On average, the repair may range from $100 to $300, including the replacement of the rocker arm oil pressure switch.

7. Can resetting the check engine light resolve OBDII code P2651 in a Honda?

Resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing OBDII code P2651. It's important to diagnose and repair the problem to prevent it from recurring.

8. How long does it take to repair OBDII code P2651 in a Honda?

The repair time for OBDII code P2651 in a Honda can vary depending on the extent of the issue and the availability of parts. In general, the repair may take around 1-2 hours to complete.

9. Is OBDII code P2651 a serious issue in a Honda?

OBDII code P2651 related to the Rocker Arm Oil Pressure Switch 'B' Circuit Low Voltage should be addressed promptly to prevent potential engine damage and performance issues. Ignoring the code can lead to more severe problems over time.

10. Can I fix OBDII code P2651 in a Honda myself?

If you have experience working on cars and access to the necessary tools, you may be able to replace the rocker arm oil pressure switch yourself. However, if you are unsure or uncomfortable with the repair process, it's best to seek professional help to ensure the issue is resolved correctly.

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