This system dynamically adjusts the camshaft phase or lift profile while the engine runs. By changing exactly when the valves open and close relative to piston position, it optimizes airflow for different engine speeds. Mechanics see this implemented through oil-pressure-driven phasers on the camshaft sprockets, which improve low-end torque, boost high-rpm power, and reduce emissions.
We've a code for the intake camshaft position actuator, so check the oil control valve for the variable valve timing system.
Sludge from missed oil changes is the number one killer of VVT components, as the tiny passages in the oil control valves clog easily.
Also heard as
- VVT
Related terms
Continuous variable valve timing
An engine valvetrain system that constantly adjusts camshaft phasing to match operating conditions.
Sequential valve timing
A variable valve timing system that uses hydraulic pressure to rotate the camshaft.
Overhead cam
A valvetrain layout where the camshaft is located in the cylinder head above the combustion chamber.