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DTC codes / P34xx · Auxiliary emission controls / P3442

P3442Cylinder 6 Deactivation/lntake Valve Control Performance

P3442 is a generic OBD-II code that indicates the powertrain control module (PCM) has detected a performance fault in the cylinder 6 deactivation or intake valve control system. The PCM commands the valve to change state and monitors the result through sensors or circuit feedback; when the expected change does not occur within the calibrated time or range, it sets this code.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaAuxiliary emission controls

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Rough idle or misfire-like shudder, especially when the engine is cold or under light load
  • Reduced engine power or poor acceleration due to a cylinder remaining deactivated or a valve stuck in the wrong position
  • Increased fuel consumption because the affected cylinder is not operating efficiently
  • Audible ticking or tapping from the valve cover area if the control solenoid is stuck or the valve train is not responding
  • In some cases, the engine may enter limp mode, limiting RPM and disabling other cylinder deactivation functions

Common causes, most likely first

  1. Faulty oil control solenoid or valve actuator for cylinder 6 deactivation, causing it to stick or fail electrically
  2. Low engine oil level or degraded oil quality, leading to insufficient oil pressure to operate the deactivation mechanism
  3. Wiring damage, corrosion, or loose connector at the cylinder 6 deactivation solenoid or intake valve control actuator
  4. Clogged oil passages or screen in the deactivation oil gallery, restricting flow to the cylinder 6 mechanism
  5. Mechanical failure inside the valve train, such as a collapsed lifter or broken rocker arm, preventing proper valve motion
  6. PCM software calibration issue or internal driver fault in the PCM affecting the control signal
  7. Contaminated oil or sludge buildup causing the solenoid valve to stick intermittently

How to diagnose and fix it

  1. Check engine oil level and condition; top off or change oil if it is low or dirty, then clear the code and retest
  2. Inspect the wiring harness and connector at the cylinder 6 deactivation solenoid for chafing, corrosion, or loose pins
  3. Measure resistance of the deactivation solenoid and compare to manufacturer specifications; replace if out of range
  4. Perform a bidirectional scan tool test to command the cylinder 6 deactivation on and off while listening for solenoid click and observing engine response
  5. Check oil pressure at the deactivation gallery port with a mechanical gauge to confirm adequate supply
  6. Remove and inspect the solenoid and oil screen for debris; clean or replace as needed
  7. If all electrical and hydraulic checks pass, perform a mechanical inspection of the valve train for cylinder 6, including lifters and rocker arms

Oil quality and pressure drive this code

  • A low oil level or overdue oil change is one of the most common triggers for P3442 because the deactivation system relies on clean, pressurized oil to move the locking pins inside the lifters.
  • The code can set intermittently and may not be present during a test drive, so always check for stored and pending codes before assuming the solenoid is defective.
  • A stuck-open or stuck-closed solenoid can cause the cylinder to remain deactivated, leading to a misfire that may be misdiagnosed as an ignition or fuel problem.
  • On some engines, the same solenoid controls both deactivation and intake valve timing; a fault can therefore affect both functions and set additional codes.
  • After repairs, a relearn or adaptation reset with a scan tool is often required to clear the learned values and prevent the code from returning immediately.

Can I keep driving with P3442?

You can usually drive the vehicle with P3442 set, but avoid heavy acceleration and towing until the fault is repaired, because a cylinder may be running deactivated and causing increased wear and fuel consumption. If the check engine light flashes or the engine runs very rough, stop driving and seek service immediately.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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