Powertrain
generic or reserved
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.
SystemPowertrain
Typegeneric or reserved
GroupP3
Range / number4 / 71
Possible causes
- Incorrect oil viscosity or aged oil high
- Switching lifter worn or sticking medium
- Internal oil leak in deactivation circuit medium
Inspection / repair
- Difficulty: shop only
- DIY: shop recommended
- Estimated cost: 300–2200 €
- Estimated time: 2–12 h
- Component: oil control valve
- Component: lifter
- Component: engine oil
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012