P2661"B" Rocker Arm Actuator System Performance/Stuck Off (Bank 2)
- 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
- P2661 is the functional check of rocker arm stage B on bank 2: although the solenoid circuit is electrically sound, the commanded switch did not happen or the confirmation (an oil pressure switch reading or a change in cam phaser or engine response) stayed too small. Bank 2 means the engine has two cylinder heads, so the fault concerns only half of the cylinders, which may show as a difference between the banks. No manufacturer documents P2661 publicly with test conditions; CARB requires valve lift systems to detect hydraulic and mechanical faults that keep them from reaching the target. Oil starvation in that head, a partly blocked oil gallery, a sticking spool or seized pins are likely. Bank 1 counterpart: P2651; electrical fault: P2660.
- What you may notice
- MIL after a completed drive cycle
- Less power in the range where stage B should engage
- Higher fuel consumption
- Likely causes
- LikelyLow oil level or poor oil supply to the bank 2 head
- PossiblePartly blocked oil gallery or screen on bank 2
- PossibleSticking solenoid spool or seized locking pins on bank 2
- 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: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.