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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 diagnostic for $0.0 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P3426 code indicates that the deactivation performance of the cylinder 4 valve is not within the correct range.
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.
The most probable causes for the P3426 code include:
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.
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.
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.
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.
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