P3449 OBD-II Trouble Code: Cylinder l7 Deactivation/Intake Valve Control Circuit/Open

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Cost of diagnosing the P3449 code

P3449 is a diagnostic trouble code (DTC) for "Cylinder l7 Deactivation/Intake Valve Control Circuit/Open". 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. 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.

Cars Estimate Credit towards follow-up repair Earliest Availability
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Toyota$20.00
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P3449 code definition

The P3449 trouble code means there is an issue with the Engine Control Module when it comes to deactivating cylinder seven on the intake valve. This can cause issues with fuel economy.

What the P3449 code means

The code indicates that the control module has found that there are discrepancies from the manufacturer’s range of values for the cylinder deactivation mode and what is being detected from the MAF sensor, the TP sensor, and the MAP sensor.

What causes the P3449 code?

There are a number of potential causes for the P3449 code to appear. They include the following:

  • Low oil pressure
  • Restricted oil passage
  • Faulty cylinder deactivation solenoid
  • Engine mechanical condition
  • Cylinder deactivation solenoid harness may be open or it may be shorted
  • Cylinder deactivation solenoid circuit may have a poor electrical connection

What are the symptoms of the P3449 code?

You will find that there are really very few symptoms of the P3449 code. In most cases, you will notice that the engine light comes on or the service engine soon warning light illuminates. Other than that, there are no real indicators that there is a problem with the vehicle.

How does a mechanic diagnose the P3449 code?

Mechanics will make use of an advanced scanner: OBD-II scanner. The scanner connects to the computer on board the vehicle. The computer has stored any trouble codes related to the vehicle. They will reset the P3449 code and then run the vehicle to see if the code returns. This indicates that the problem is real and was not triggered accidentally. If the code returns, then they will try to diagnose what has caused the code to appear and make the necessary repairs and fixes to remove it.

How serious is the P3449 code?

The P3449 code will usually only cause the Check Engine light to come on, and there are not usually any other issues noticed with the vehicle. However, this does not mean it is a problem you should ignore. If you find that the onboard computer has stored the P3449 code, you should have the issue looked at and taken care of by a mechanic as soon as you can. This will ensure that your vehicle is in good running order, and that there are no other issues present.

What repairs can fix the P3449 code?

The following are some of the potential repairs that a mechanic may need to make in fixing the P3449 code.

  • Check the onboard computer in the vehicle for the code, reset the code, run the vehicle and see if the code returns

  • Replace the intake and exhaust valves

  • Check the diagnostic computer to make sure it is working properly, and replace if needed, although this is rare

Additional comments for consideration regarding the P3449 code

One of the issues with the P3449 code, as well as a number of the other trouble codes that are in existence is that they do not present any massive problems to the vehicle’s owner. Many owners believe this means that they can ignore the problem. Even though will not cause problems when you are driving, it is always in your best interest to get the vehicle serviced and have the P3449 code and any other codes fixed.

Need help with a P3449 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.

trouble codes
P3449
Check Engine Light

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Angelo

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Angelo
10 years of experience
Lexus RX350 - Check Engine Light is on - Nashville, Tennessee
Angelo was great!! Communicated with me really well and often, and made sure I fully understood the problem and how he fixed it. Highly recommend!!

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Casey
19 years of experience
Ford Fusion - Check Engine Light is on - Katy, Texas
Casey was super great, he spent a good amount of time doing a thorough investigation to make sure he diagnosed the issue with my car correctly and gave me sound advice. He also spent time explaining to me what the problem was which was much appreciated.

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33 years of experience
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Matthew
33 years of experience
Ford Expedition - Check Engine Light is on - Hampton, Virginia
As always, he's never late, very professional, has never went pass the estimated time, goes above and beyond and he breaks it down and explains everything so that you know exactly what he did and what needs to be done. Always satisfied with his work.


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