P2647"A" Rocker Arm Actuator System Stuck On (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Here actuator A on bank 1 is believed to stay engaged: the rocker arms remain locked in the switched mode although the controller has asked for the default lift. GM's 2015 four-cylinder table 15OBDG05 detects this with the same intrusive lift toggle as P2646 but flags a filtered pressure-ripple value that falls below its limit; conditions are 1,200 to 1,800 rpm, 40 to 230 Nm, oil pressure 50 to 1,000 kPa, Type A after one trip. On the Honda-built 3.5 L V6 (L66) in GM's 2004 and 2005 tables, the VTEC pressure switch keeps signalling oil pressure for 5 s while the solenoid is off. On i-VTEC four-cylinders, Honda's bulletin 13-021 files a high-voltage switch reading under P2647 instead. Further causes: a solenoid leaking oil or a jammed locking pin. Expect rough idle, misfire or poor low-speed response.
- What you may notice
- Rough or lumpy idle
- Misfire at low load
- Sluggish response when pulling away
- Likely causes
- LikelyOil control solenoid leaks oil while switched off
- PossibleLocking pin jammed in the engaged position
- PossibleFaulty rocker arm oil pressure switch (Honda VTEC)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.