What does it mean?
P3422 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Cylinder 3 Exhaust 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) usually comes on once the engine is fully warm
- Rough running and vibration while the system tries to switch valve modes
- Cylinder 3 misfire that appears and disappears with oil temperature
- Loud, load-dependent ticking from the valve train
- Reduced power at higher rpm and worse fuel economy
- The complaint often improves briefly after fresh oil and then returns
Likely causes
- Low or degraded engine oil; these switching mechanisms rely entirely on clean oil pressure
- Oil viscosity outside the specified grade, causing slow or incomplete switching
- Restricted feed passage, clogged filter screen or sludge inside the oil control valve bore
- Sticking or worn switching component on the cylinder 3 exhaust valve, so it fails to lock or unlock
- Solenoid spool moving sluggishly from varnish deposits even though the coil tests fine
- Oil pressure below specification from a tired pump or a faulty pressure control solenoid
- Valve train or timing chain wear shifting the measured response outside the module's window
How to fix it
- Verify oil level and condition first, and confirm that the correct grade was used at the last service
- Read freeze frame to see the oil temperature, rpm and load at which the code set
- Command the solenoid on and off with the scan tool and watch for any change in idle quality or live data
- Measure oil pressure with a mechanical gauge, engine hot, both at idle and at raised rpm
- Remove the solenoid and inspect the screen and bore for varnish, sludge and metal particles; clean or replace as required
- If the oil circuit checks out, inspect the cylinder 3 exhaust switching lifter and rocker hardware for wear
- Finish with an oil and filter change and confirm through several warm-up cycles that the code stays away