Skip the auto shop - Our mechanics make house calls

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

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


Post a question and get free advice from our certified mechanics.


More related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...

Related questions

Q: Bad Ignition/electrical issue - takes several cranks before it starts!

Hello there, you have a few different faults going on with your 2007 Chevrolet Impala. A vehicle should not have to crank long before it starts unless there is a fault. Given the codes you have listed there are a...

Q: Car shaking after Check Engine light came on.

It sounds like you have a cylinder misfiring. I would recommend having a technician come out and check the code on the car to determine what is causing the misfire. It could be a wide range of things such as...

Q: My car jerks slightly when I'm at a steady speed or trying to stay at a constant speed only around 40mph to 50 mph

In the future, please include the codes as they can help use pinpoint and give you a more accurate answer. The surging you feel while under light throttle, which is what is happening at a cruise, is due to...