P3466
Cylinder Deactivation Hydraulic Circuit Bank 1 Open
The engine control module has detected an open hydraulic circuit in the cylinder deactivation system on bank 1. The system uses pressurized engine oil routed through dedicated lifters and oil control valves to collapse valves; an open circuit indicates loss of oil flow or a failed pressure switch.
- 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
P3466 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.