P2647
A Rocker Arm Actuator System Stuck On Bank 1
On variable valve lift systems (e.g. Honda VTEC) the ECU detects that the bank 1 rocker arm actuator is stuck in the engaged (high lift) position. Idle quality and fuel economy are affected.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Insufficient oil pressure / levelCommon
- Stuck VVL solenoidPossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- Vvl Actuator
- Rocker Arm
- Oil Passages
P2647 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.