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

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Cost of diagnosing the P3426 code

P3426 is a diagnostic trouble code (DTC) for "Cylinder 4 Deactivation/Intake Valve Control Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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.

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Nazareth

26 years of experience
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Nazareth
26 years of experience
Mercedes-Benz CLA250 - Check Engine Light is on - Los Angeles, California
Polite and very professional! Nazareth quickly identified my car was suffering from low voltage issues and the battery was the problem. The reader was showing 8 volts hence why my car didn’t receive enough power to start, it needed 12v. My battery was 4 years old and never been changed. Thank you Nazareth!

Cornelius

17 years of experience
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Cornelius
17 years of experience
Chevrolet Cobalt - Check Engine Light is on - Peachtree City, Georgia
He was very helpful with explaining what could lead to my check engine light being on. And helping clear my engine light.

Marco

28 years of experience
78 reviews
Marco
28 years of experience
Nissan Maxima - Check Engine Light is on - Highland, California
Marco did a great job of finding the source of the problem and his recommendations were greatly appreciated.

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8 years of experience
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Juan
8 years of experience
Chevrolet Tahoe - Check Engine Light is on - Altamonte Springs, Florida
Juan was on time for both appointments. He was knowledgeable and polite and I will most definitely be requesting him for my next steps based on the quote he provided me for other issues I need to address. Excellent customer service and top notch repair work!


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