Skip the auto shop - Our mechanics make house calls

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

Check Engine Light

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.

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

How Long Does a Throttle Return Spring Last?
Not all vehicles on the road feature an electronic throttle control (ETC), which is also called drive-by-wire. For vehicles that don't offer this system, they have a throttle cable instead that...
P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem What the P0121 code means P0121 is a generic OBD-II code which indicates that the Engine Control...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222 code means The manufacturer specifies a range of acceptable voltage to be produced from the throttle position...

Related questions

Q: P0755 & P0700 error codes

The problem with buying used tires and not having them balanced is the potential problems they can cause. Most transmissions - or more specifically, the Powertrain Control Module (PCM) which controls the transmission and drive line - contain incredibly...

Q: P2107 - 2005 Ford Freestyle

Hello. P2107 is the code for an issue with the vehicle's throttle control module processor. Basically, the computer has detected an issue with the vehicle's electronic throttle body and has put the vehicle in safe mode. The throttle body...

Q: Truck won't run like it used to

Hi, thanks for writing in. Believe it or not, this happens quite a bit when people swap OEM air filters to K&N or other products. It has nothing to do with the aftermarket part however. The P-0104 OBD-II error code...