P3426 OBD-II Trouble Code: Cylinder 4 Deactivation/Intake Valve Control Performance

check engine light

P3426 code definition

The P3426 code indicates that the deactivation performance of the cylinder 4 valve is not within the correct range.

What the P3426 code means

In order to maximize fuel economy, certain cylinders will be deactivated during specific driving conditions. This is accomplished by not allowing an intake valve to open on the cylinder. Data is measured by the MAF sensor, the MAP sensor, and the TP sensor to ensure that the cylinder deactivation was performed correctly. If this data does not match the manufacturer’s specifications in relation to the deactivation of cylinder 4, the P3426 code will be stored.

What causes the P3426 code?

The most probable causes for the P3426 code include:

  • Low oil pressure
  • Faulty cylinder deactivation solenoid
  • Restricted oil passage
  • Open or shorted cylinder deactivation solenoid harness
  • Poor electrical connection in the cylinder deactivation solenoid circuit
  • Faulty MAF, MAP, or TP sensors

What are the symptoms of the P3426 code?

When the P3426 code is detected, the Check Engine Light will be illuminated. It may take more than one drive cycle for this indicator to be activated.

How does a mechanic diagnose the P3426 code?

After an OBD-II scanner detects the P3426 code, a technician should perform a visual inspection of all the wiring, connectors, and other components related to the cylinder intake valve, as well as to the MAF sensor, the MAP sensor, and the TP sensor; any damaged components should be replaced, reconnected, or repaired as necessary. After the code is cleared, they should then retest the system. If the code returns, then the P3426 code points to a larger issue that should be repaired.

How serious is the P3426 code?

If the P3426 code is being detected, repairs should be made as soon as possible. While a driver may or may not notice any chance in their vehicle’s performance due to the cause of this code, the engine’s inability to control the intake valve of a cylinder may result in a more serious issue in the future.

What repairs can fix the P3426 code?

There are many ways that a mechanic may address a P3426 code detection. They include:

  • Replacing a faulty cylinder deactivation solenoid.

  • Clearing a restricted oil passage.

  • Replacing or repairing an open or shorted cylinder deactivation solenoid harness.

  • Replacing electrical components in the cylinder deactivation solenoid circuit to improve the connection.

  • Replacing faulty MAF, MAP, or TP sensors.

Need help with a P3426 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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