What does it mean?
P3442 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Cylinder 6 Deactivation/Intake Valve Control Circuit Performance . This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.
Symptoms
- MIL (check engine lamp) normally lights only after the engine is thoroughly warmed up
- Shudder, jolt or stumble as the engine moves between full and reduced-cylinder operation
- Rough idle with an intermittent cylinder 6 misfire
- Valve train noise that rises and falls with load and oil temperature
- Fuel economy worsens once the system disables itself
- The complaint often tracks the oil service interval, easing after a change and returning later
Likely causes
- Low oil level or oil well past its service life, leaving the actuator without stable pressure
- Oil viscosity outside the specified grade, which slows the switching action
- Restricted oil passage, blocked filter screen or sludge inside the oil control valve
- Sticking or worn switching lifter / roller finger follower on cylinder 6
- Solenoid spool moving slowly because of varnish, even with a healthy coil
- Oil pressure below specification from a worn pump, faulty pressure control solenoid or excessive clearances
- Valve train and chain wear that shifts the mechanical response the module measures
How to fix it
- Check the oil level, oil condition and service history and confirm the specified viscosity
- Study freeze frame data for the oil temperature and load at which the code set
- Command the solenoid on and off with a scan tool and watch for any change in idle quality or live data
- Measure actual oil pressure with a mechanical gauge, hot, at idle and at raised rpm
- Remove the solenoid and inspect the screen and bore for varnish, sludge and metal particles; clean or replace
- If the hydraulic side is sound, inspect the cylinder 6 switching lifter and rocker assembly
- Change the oil and filter after the repair and confirm over several drive cycles that the code does not return