Engine-Codes - Honda - P2646 Honda

P2646 Honda Code - Rocker Arm Oil Pressure Switch Circuit Low Voltage

- Code Popularity: 330,912 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code P2646 Honda?

  • 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 P2646 Honda Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|Code P2646 Honda Tech Notes

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






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|What is the Cost to Diagnose the Code P2646 Honda?

Labor: 1.0

The cost to diagnose the P2646 Honda code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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|What are Code P2646 Honda Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the P2646 Honda Code Mean?

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.
Rocker Arm Oil Pressure Switch Circuit Low Voltage

|Need more Information on the P2646 Honda Code?

Need more information on how to fix the P2646 Honda code? Get Access to Factory Service Manuals

|Code P2646 Honda Information for Specific Honda Models

|Need Help with the P2646 Honda Code?

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