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P3419 OBD-II Trouble Code: Cylinder 3 Deactivation/Intake Valve Control Circuit Low

check engine light

P3419 code definition

Detecting the P3419 code indicates that there has been a malfunction when the cylinder deactivation mode was activated. It is often associated with many other codes relating to cylinder deactivation, such as the P3400 code.

What the P3419 code means

Under certain situations, some engines will deactivate specific cylinders in order to improve engine performance and fuel economy. Deactivation is controlled by solenoids, which prevent the valve lifters from opening valves by restricting oil flow. There are sensors that monitor this process, the MAF sensor, the MAP sensor, and the TP sensor. If the PCM detects that the values from these sensors are lower than the programmed values based on the manufacturer’s specifications, it will store the P3419 code.

What causes the P3419 code?

Low oil pressure, or restricted oil flow, is often to blame for the P3419 code. Other causes may include:

  • A mechanical failure within the engine
  • Faulty cylinder deactivation solenoid
  • Open or shorted cylinder deactivation solenoid harness
  • Poor connection in the electrical circuit of the cylinder deactivation solenoid
  • Faulty MAF, MAP, or TP sensors
  • Faulty valve lifters

What are the symptoms of the P3419 code?

The only common symptom of the P3419 code is the illumination of the Check Engine Light; however, there may also be some vibration in the engine.

How does a mechanic diagnose the P3419 code?

In order to pinpoint the root cause of the P3419 code, a mechanic will likely take some or all of the following steps:

  • Check the engine oil levels and pressure, and ensure that both are correct.

  • Collect diagnostic codes from the PCM with an OBD-II scanner, and assess for related codes that could give clues as to what is malfunctioning.

  • Use a scan tool to test the proper solenoid, and repair or replace a malfunctioning solenoid.

  • Clean any oil passages to remove possible clogs, and replace the lifters.

This process will eliminate the most basic issues with the cylinder deactivation system, and help narrow down what could be the cause of the P3419 code.

Common mistakes when diagnosing the P3419 code

When diagnosing the cause of the P3419 code, the most common mistake is forgetting to clear the code and do a road test after each potential solution is performed. If the most common repairs do not stop the Check Engine light from reappearing, it can be a sign of an intermittent issue that requires a more in-depth diagnostic procedure.

How serious is the P3419 code?

If this code is present in the PCM memory, the vehicle should still be operational. However, in most cases there will be an increase in emissions and a loss of fuel economy. The vehicle may not operate as optimally as it could, and it may not pass an emissions test, until the issue that caused the P3419 code is addressed.

What repairs can fix the P3419 code?

In order to repair issues that cause the P3419 code to be stored in the PCM, there are several areas a mechanic may consider. These repairs could include:

  • Replacing defective cylinder deactivation solenoids.

  • Clearing all deactivation solenoid oil passages of grime, build-up, and clogs.

  • Replacing the lifters.

  • Replacing or repairing faulty solenoid harnesses.

  • Replacing faulty sensors.

  • Disassembling the engine and cleaning the entire thing, paying close attention to dirt and oil sludge.

Additional comments for consideration regarding the P3419 code

While this code does not represent a vitally serious issue, it does sometimes represent a very complex repair, that can quickly become a big job. In order to repair this issue correctly, mechanics often need many years of experience and knowledge. This may not be a job for even the handiest of DIY-ers.

Need help with a P3419 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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