P2646 Honda - VTEC Oil Pressure Switch Circuit Low Voltage
- 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
For the 2003–2005 Accord L4s, 2003–2005 Elements, and 2002–2005 CR-V Honda models replacing the VTEC oil pressure switch (P/N 37250-PNE-G01, H/C 6737217) usually fixes the problem.
- Engine Light ON (or Service Engine Soon Warning Light)
P2646 Honda Description
The 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 a DTC is stored.
P2646 Honda Information for specific Honda models
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HONDA Technical Service Bulletins for P2646 code
2003 HONDA ACCORD Electrical System Details
2004 HONDA ACCORD Electrical System Details
2005 HONDA ACCORD Electrical System Details
2002 HONDA CR-V Electrical System Details
2003 HONDA CR-V Electrical System Details
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