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P2647 fault code: what it means

P2647: Honda rocker arm (VTEC) oil pressure switch circuit high voltage: the switch signal does not match what the ECU expects when VTEC is commanded.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. low or dirty engine oil
  2. blocked VTEC filter screens or faulty VTEC solenoid
  3. faulty rocker arm oil pressure switch
  4. switch wiring or connector fault

P2647 by make

Honda

Honda rocker arm (VTEC) oil pressure switch circuit high voltage: the switch signal does not match what the ECU expects when VTEC is commanded.

Usual causes: low or dirty engine oil; blocked VTEC filter screens or faulty VTEC solenoid; faulty rocker arm oil pressure switch; switch wiring or connector fault

Not sure what P2647 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.