Honda
Honda rocker arm (VTEC) oil pressure switch circuit low voltage: the ECU did not see the right oil pressure signal when VTEC switched. Common on K-series Accord, CR-V, Element, Civic and Fit.
P2646 fault code: what it means
P2646: Honda rocker arm (VTEC) oil pressure switch circuit low voltage: the ECU did not see the right oil pressure signal when VTEC switched. Common on K-series Accord, CR-V, Element, Civic and Fit.
Usual causes, most likely first
- low or dirty engine oil
- blocked VTEC filter screens
- faulty VTEC solenoid
- faulty rocker arm oil pressure switch (Honda TSB 13-021)
P2646 by make
What the repair usually costs
- Alternator replace (small / medium car, petrol)NZ$510–NZ$1,020 · A$480–A$1,000
- Alternator replace (SUV / ute / diesel)NZ$750–NZ$1,560 · A$710–A$1,490
- Alternator replace (European, smart charging)NZ$930–NZ$2,130 · A$850–A$1,990
Not sure what P2646 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.