P2651 Honda 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 Check engine oil level and pressure, Faulty VTEC Oil Pressure Switch, VTEC 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
- P2651 Honda indicates Rocker Arm Oil Pressure Switch 'B' Circuit Low Voltage.
- Common causes
- Common causes include Check engine oil level and pressure, Faulty VTEC Oil Pressure Switch, VTEC 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.
Code P2651 Honda Description
What are the Possible Causes of the DTC P2651 Honda?
- Check engine oil level and pressure
- Faulty VTEC Oil Pressure Switch
- VTEC Oil Pressure Switch harness is open or shorted
- VTEC Oil Pressure Switch circuit poor electrical connection
How to Fix the DTC P2651 Honda?
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.
Code Tech Notes
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2651 Honda 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 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
- P2651 2008 Honda Accord — Rocker Arm Oil Pressure Switch 'B' Circuit Low Voltage
- P2651 2009 Honda Accord — Rocker Arm Oil Pressure Switch 'B' Circuit Low Voltage
- P2651 2010 Honda Accord — Rocker Arm Oil Pressure Switch 'B' Circuit Low Voltage
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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