P3470
Cylinder Deactivation Hydraulic Circuit Bank 2 Open
The engine control module has detected an open hydraulic circuit in the cylinder deactivation system on bank 2. Loss of oil flow, a failed oil pressure switch or a disconnected oil control valve prevents the system from deactivating cylinders on bank 2.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: shop_only
Common causes
Ordered by how often each turns out to be the cause.
- Oil pressure switch failedCommon
- Oil passage blocked or sludge buildupPossible
- Oil control valve stuckPossible
Parts involved
- Oil Control Valve
- Oil Pressure Switch
- Lifter
- Engine Oil Passage
P3470 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.