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The solenoid that routes oil pressure to the lifters of one cylinder so that cylinder can be switched off under light load.

It is not the same part as the valve control solenoid on a variable valve timing system, and the distinction matters when reading a quote. A VVT solenoid phases a camshaft, advancing or retarding when the valves open. This one does not change timing at all — it collapses a lifter so a valve does not open. Both are oil-directing solenoids on the same engine, both fail for similar reasons, and they are frequently confused.

How it fails is mostly about where it lives. These solenoids sit in the valley or the head, often grouped in a manifold assembly, in the hottest and dirtiest oil in the engine. Windings fail open, but far more often the fault is contamination: varnish from neglected oil in a passage narrower than a pencil lead, or oil that has wicked into the connector from a leaking seal directly above it.

Check its screen and the oil before condemning the solenoid, and read every stored code first — several cylinders reporting together is a shared supply, a shared ground or the module, not several failed solenoids.