P3471
Cylinder Deactivation Hydraulic Circuit Bank 2 Performance
The engine control module has detected a performance fault in the bank 2 hydraulic circuit used for cylinder deactivation. Oil pressure response or actuation timing falls outside the expected window during deactivation events on bank 2, often caused by viscosity issues, internal leaks or worn switching lifters.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: shop_only
Common causes
Ordered by how often each turns out to be the cause.
- Incorrect oil viscosity or aged oilCommon
- Switching lifter worn or stickingPossible
- Internal oil leak in deactivation circuitPossible
Parts involved
- Oil Control Valve
- Lifter
- Engine Oil
P3471 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.