P0449 Hyundai Sonata? (TOP 5 Tips)

  • Hyundai Sonata P0449 Definition P0449 is a universal OBDII trouble code. This means that regardless of which make or model of vehicle, the code will mean the same thing (Sonata or not, as long as it was manufactured after 1996). P0449 indicates that the valve or solenoid circuit that controls the evaporation system is not functioning properly.

How do I fix code P0449?

What repairs can fix the P0449 code?

  1. Repairing or replacing the wiring harness.
  2. Replacing the charcoal canister vent valve.
  3. Repairing faulty electrical connections.
  4. Replacing faulty ECU.

What causes a P0449 code?

Defective vent valves, fuel tank filler necks, EVAP hoses, carbon canisters, gaskets, and fuel tanks are all potential causes of code P0449. Since a code P0449 relates to a leak in the evaporation system, anywhere that fumes could be escaping is a potential cause.

Where is the canister purge valve located Hyundai Sonata?

The purge valve is located in the vacuum line between the fuel vapor containment canister and the intake manifold. It opens at specific times to let fuel vapors stored in the canister be drawn into the intake manifold and burned as part of the combustion process.

Where is the EVAP vent solenoid located?

In most cars, the EVAP vent valve is located underneath the vehicle, close to or at the charcoal canister near the fuel tank, see the photo.

Can I drive with a P0449 code?

Code P0449 does not pose any serious danger to the driver or the vehicle and there are no drivability issues that may occur. However as the case with all Check Engine Light codes, it should be fixed as soon as possible to prevent any further damage to your vehicle.

What happens when EVAP solenoid goes bad?

On top of a rough idle, a vehicle with a failing EVAP canister purge valve will display signs of poor engine performance. The engine may feel like its running “weak” and won’t generate sufficient power for acceleration. Accelerating will feel like you’re pressing the pedal down and moving slower.

How much does it cost to replace a vent valve?

To have your canister purge valve replaced, you will pay anywhere between $110 and $170. The parts are the expensive component here, as they will run between $75 and $110. The labor, on the other hand, usually only costs about $50, meaning this is a rather quick and straightforward procedure.

What code is po446?

Code P0446 means the car’s computer has detected a problem with the EVAP system vent valve. The EVAP system is primarily composed of the gas tank, gas cap, vent valve, purge valve, and charcoal canister.

What are the symptoms of a bad vent valve?

5 Symptoms of a Bad Vapor Canister Purge Valve (and Replacement

  • Check Engine Light.
  • Rough Idle.
  • Trouble Starting Car.
  • Poor Engine Performance.
  • Emissions Test Failure.

What is purge valve?

A purge valve is an integral component of a vacuum material conveying system that not only provides an on/off flow of material into a conveying line, but also a way to purge that conveying line with air at the end of every material loading cycle.

How do I fix code P0455?

What repairs can fix the P0455 code?

  1. Replacing the gas cap if it doesn’t tighten or seal.
  2. Replacing the fuel filler neck if it’s damaged or has anything that would prevent it from sealing with the cap.
  3. Repairing any hose problems.

Where is the purge valve on a 2006 Hyundai Sonata?

The EVAP canister, otherwise known as the purge valve, on the 2006 Hyundai Sonata is located above the rear of the muffler.

How much does it cost to replace a EVAP solenoid?

Replacing a canister purge solenoid is a pretty straightforward type of job that doesn’t cost too much. Expect to pay anywhere from $80 to $200 in total. The part will typically cost anywhere from $30 to $120, while the labor costs will be right around $50 to $80.

Can you bypass EVAP canister?

Now just unplug the pressure sensor and unbolt the Charcoal Canister to pull it all out. Easy peasy! This can easily be done without any modifications in just a few minutes, so everything can easily be put back into place when you need to pass SMOG or Inspection.

Hyundai Sonata P0449: Vent Valve Solenoid – Circuit Malfunction

TheP0449 code is associated with theHyundai Sonata, and it is a rather common problem. This code refers to a number that you will be given when you connect it to an OBD2 scanner. It is P0449 that is concerned with the evaporative emissions control system (EVAP). It is frequently found in conjunction with or connected to other codes, such as P0420, P0446, and, less frequently, P0455. Most of the time, P0449 does not pose a serious threat to the driving abilities of your Sonata. Certainly, once the service engine soon light comes on, it’s best to get it fixed as soon as possible; however, this isn’t always practical.

These scanners may be found in almost every store.

Hyundai Sonata P0449 Definition

P0449 is an OBDII error code that might be encountered anywhere. This implies that no matter what make or model of car is involved, the code will always indicate the same thing (Sonata or not, as long as it was manufactured after 1996). When the error code P0449 occurs, it means that the valve or solenoid circuit that controls the evaporation system is not operating properly. A vehicle’s exhaust gas recirculation system (EVAP) cycles gasoline vapor from the gas tank into the intake manifold, a charcoal canister, or straight into the atmosphere, depending on the model of vehicle.

Vehicle’s ECM (Engine Control Module) has recognized that there is a malfunction in the circuit that regulates the vent that releases the gasoline vapor from the system, and it has initiated an investigation.

Hyundai Sonata P0449 OBDII Code Symptoms

It is often that the service engine soon light is the sole indication that the P0449 code has been activated. The P0449 code is often not accompanied by any apparent symptoms other than the smell of gasoline and the service engine soon light turning on and off. The tiniest decrease in fuel economy may also be noticed by the driver. You should pay particular attention to the smell of petrol in the vicinity of the fuel tank or the fuel filler tube. The EVAP system is directly involved in the vaporization of fuel.

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Sonata P0449 Trouble Code Causes

P0449 issue code in your Hyundai Sonata can be triggered by a variety of different events or circumstances. Here are the most typical issues that can cause the code to be thrown, as well as a fantastic video on how to resolve them:

  • Fuel Cap – A faulty fuel cap will very certainly result in the code being thrown. Occasionally, you’ll receive a notification notifying you that the fuel cap is not in place, even when it is. Whether you are seeing that warning in addition to a P0449, replacing the fuel cap and seeing if the problem goes away may save you a lot of time and money. EVAP System Line – The hose that transports the fuel vapor from the fuel tank to the intake manifold might develop a leak at some point. This will result in the P0449 error code. Take a look for a tear or a hole in the fabric. This is one of the most prevalent difficulties that leads to the appearance of this error code. Without doing a smoke test, it might be difficult to locate the hole. Vapor Canister Purge Valve – The vapor canister purge valve is one of the most common causes of the P0449 error number. It is located in the vapor canister. It is really simple to replace. There are a couple of clips that you’ll need to locate and unclip. Here’s a YouTube video that demonstrates how to test a purge valve: Problems with the fuse or wiring – If the wiring leading to the valve has been compromised, the P0449 error code will be shown. A faulty gasket that connects the fuel sending unit to the gas tank is a possibility when the fuel sending unit is connected to the gas tank. This has the potential to lower tank pressure and cause the code to be thrown. This is certainly not the place to begin
  • Instead, consider the following: Gasoline Filler Neck – Where the fuel filler neck joins to the gas tank, a gasket is frequently used to seal the connection. This gasket is susceptible to drying out, particularly in automobiles that spend a significant amount of time in arid areas. When it dries out, the fuel tank is unable to maintain pressure, resulting in an erroneous P0449 code being shown.

P0449 Diagnosis- Hyundai Sonata

A mechanic has a broad variety of diagnostic tools at his (or her) disposal to figure out what is causing the P0449 code in your Hyundai Sonata. The following are the most often encountered procedures for diagnosing the error code:

  • The mechanic will examine the gas cap to ensure that it is capable of withstanding the pressure. In the event that you are receiving a warning that your gas cap is off, even while it is turned on, replacing it will almost certainly remove the code. In most cases, the mechanic will check to see if there are any additional fault codes present. The greater the number of issue codes available, the easier it may be to detect a problem. This is due to the fact that when they occur together in specific combinations, there will frequently only be a few situations that will cause any combination of codes to be thrown at the same time
  • In most cases, after determining which fault codes are associated with the P0449, the technician will proceed to examine the EVAP system. The purge valve, line, and canister are all included in this. There will be an inspection and monitoring of the gasoline tank pressure. Following the completion of the above-mentioned examinations and repairs, the mechanic will conduct two tests: EVAP solenoids and valves will be tested using a smoke test, and a scan tool will be used to ensure that they are performing properly.

Are you still experiencing problems?

Here is an extremely technical video that goes into great detail on diagnosing P0449.

Most Common P0449 Fixes

Continue to have problems? A very technical video that goes into great detail on diagnosing P0449 may be found here.

  • Replacement of the gas cap
  • Replacement of the EVAP line
  • Replacement of the vent valve
  • And repair of the wiring

Because the gas cap is by far the easiest and least costly thing to replace on this list, it would be advisable to begin with it and work your way up to the gasoline tank. This is because the gas cap is by far the easiest and least expensive item to replace on this list. Watch this excellent video to learn how to test your gas cap. Good luck figuring out what is causing the P0449 code to appear on your Hyundai Sonata’s dashboard. We hope this has been of assistance. Any additional information that you would like to share is welcome in the comments section below.

Is P0449 a Serious Concern?

Despite the fact that P0449 will not cause the Sonata’s engine to shut down, it should not be taken lightly. It’s possible that you have a fuel leak. Pay close attention to the level of your gasoline tank and make sure you are not leaking any petrol. We encourage that you bring it in and/or deal with it as soon as possible.

P0449 Hyundai Sonata

However, even though P0449 will not force the engine of the Sonata to shut down, it should not be ignored. Perhaps there is an issue with your gasoline. Check your tank level frequently and make sure there is no gasoline escaping from the vehicle. The best course of action is to have it checked out and/or dealt with on the spot.

What causes a P0449 Hyundai Sonata trouble code?

Whenever the fuel tank pressure sensor gives a reading less than 30 hPa (fuel tank pressure too low) or when the fuel tank pressure sensor voltage is less than 1.6v for more than 10 seconds, the P0449 Hyundai Sonata fault code is set and displays on the instrument panel. This is seen by the computer as an issue caused by insufficient ventilation being permitted into the fuel tank. Several factors, including canister air filter contamination and problems with the CCV valve and wiring harness, are listed in the shop manual as potential causes of the problem.

How to diagnose a P0449 evaporative emission system vent valve

When the engine is operating, the CCV should be kept open to the environment at all times to allow for proper cooling. In effect, the CCV functions as a gas cap relief valve, allowing air to replace the gas that has been utilized. When the engine is operating, the ECU keeps track of the pressure in the fuel tank. As a result, if the pressure drops, indicating a vacuum condition, the P0449 fault code is generated. It is possible to experience a vacuum state when gasoline is depleted, but no relief air is permitted to enter the system in order to restore the volume lost.

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As a result, when the CCV is de-energized, it is OPEN to the surrounding environment.

When the IGN is in the OFF position, you should be able to blow through the CCV without difficulty. You should inspect the CCV air filter to determine if it is blocked or otherwise limited if you are unable to blow through it. If the valve has become jammed closed. Replace the valve with a new one.

Where is the CCV?

In close proximity to the charcoal canister, the CCV may be found. Rick Muscoplat’s 2017 Rick Muscoplat’s Rick Muscoplat posted a blog entry on

Hyundai P0449 EVAP System Vent Valve/Solenoid Circuit – Car OBD Codes

P0449 is the OBD2 code. Hyundai’s definition is as follows: Through the counting of pulses on the sensor disk placed in the injection pump, the optical sensor transmits a high-resolution signal to the Powertrain Control Module (PCM) for processing. When it comes to fuel regulation and timing, the high resolution is one of the most significant inputs that the PCM receives. This test keeps track of the number of high-resolution pulses that have been missed during the test (not detected). It is based on a comparison between the number of pulses that have been detected since the last pump cam pulse and the number of pulses that should have happened since the last pump cam pulse.


OBD code P0449 Hyundai– Engine Light On has several possible symptoms (or Service Engine Soon Warning Light)


P0449 Hyundai OBD code causes and possible solutions – An open or short in the optical sensor circuit – An optical sensor connection – A damaged optical sensor – A damaged PCM or ECM – A damaged optical sensor connector Error codes are normally activated when one or more of the following situations are detected: From the optical sensor to the PCM, there are several high resolution pulses that are missing.

Possible Solutions

– If there is damage, fix the optical sensor circuit. – If there is damage, replace the optical sensor.

The OBD2 Code Information Be Applicable For Hyundai:

The optical sensor circuit should be repaired if it has been damaged; otherwise, it should be replaced; and the PCM or ECM should be replaced.


1. The list of vehicle manufacturers on the right-hand side of the display screen. The Hyundai brands are represented by the ODB-ii codes that are currently in use. 2. Use the search box to look for any other OBD II Trouble Codes that may exist. In the search box, type in the five-character problem codes and hit the ‘Search’ button. Remember that a particularOBD-II code does not always represent the same thing across different vehicle manufacturers, since there are numerous different manufactures specific codes in use.

This is because not allOBD2 codes used by one manufacturer are also used by other manufacturers.

The material included on this website is provided solely for the purpose of providing general information.

If you have any questions or concerns about the repairs on your car, please speak with your mechanic.

2011 Hyundai Sonata Code P0449

Whenever you buy on Amazon.com (for anything), please click on this link to help support OBD-Codes.com! Young30 Posts:4 Joined on: Monday, December 11, 2017 at 5:32 a.m. Hyundai Sonata SE 2.4L (2011 model year)

2011 Hyundai Sonata Code P0449

I have a Hyundai Sonata 2011 and I have the code po449, which I had changed earlier around 3-4 months, and after passing the emissions test, after 2 months, my check engine light came back on and the same code I had, so do I have to buy it again? Thanks in advance.

What should I do? I’m in desperate need of assistance. Last edited bymmsstaron; 04-03-2019 at 05:35. On Mon, December 11, 2017 at 11:43 a.m., I modified the post one time. Reason: title was changed, and topiccj1 was separated. Posts:1888 Joined on Friday, January 24, 2014 at 5:37 p.m.

Re: 2011 Hyundai Sonata Code P0449

Postbycj1» The following are some procedures to follow in order to diagnose and repair this error code: Check your fuses; there may be a fuse that powers the vent solenoid that needs to be replaced. – Examine the wire harness for signs of rubbing through or chafing. Make a visual inspection of both wires to check if they are shorted together or to the ground or to the power. Inspect the vent valve for cracks or damage using a visual inspection method. Trace the wires leading to and from the PCM/EMC/ECM and test for continuity using a digital volt-ohm meter to ensure that they are not damaged (DVOM).

Hyundai Sonata SE 2.4L (2011 model year)

Re: 2011 Hyundai Sonata Code P0449

PostbyYoung30» Okay, but I double-checked everything since there was nothing wrong, and the fuses seemed okay. The light continues turning off by itself and coming back on again around 5-10 milliseconds later. Young30 Posts:4 Joined on: Monday, December 11, 2017 at 5:32 a.m. Hyundai Sonata SE 2.4L (2011 model year) Randy Collins is an American actor and singer who is best known for his role in the film The Great Gatsby. Posts:1 Joined at 6:49 p.m. on June 20, 2018.

Re: 2008 hyundai sante fe limited

Randy Collins has written a post. When I start my Hyundai Santa Fe Limited with a 3.3-liter engine and drive for 5 minutes, it begins to splutter and misfire. How do I go about repairing the po302 problem? Could someone please provide me with some answers?

Gas Pump Keeps Shutting Off – Page 2

SiwardMember 15th of March, 2008269 posts32 votes 20th of January, 2016, 8:39 a.m. The vehicle in question is a 2011 Hyundai Sonata. My CEL has just come on, displaying the P0449 error code. 20th of January, 2016, 8:47 a.m. Addict to MacGyverDeal Ottawa, Ontario, Canada, March 8, 20024232 posts875 upvotes 20th of January, 2016, 8:47 a.m. Siwardwrote:↑ The vehicle in question is a 2011 Hyundai Sonata. My CEL has just come on, displaying the P0449 error code. ‘Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction’ is an abbreviation for this.

  • 20th of January, 2016, 12:51 p.m.
  • ‘When gasoline is introduced into the EVAP (Evaporative Emission Control System), rather than merely vapour, harm might occur.
  • The moral of the story is: don’t attempt to overfill your tank on every single occasion.
  • 20th of January, 2016, 1:00 p.m.
  • Member of the Board of Directors 810 posts and 321 upvotes on May 6, 2013 Toronto 20th of January, 2016, 1:00 p.m.
  • I had an Evap CEL on my previous car that didn’t go away for 2 years because the vapour canister was saturated with moisture (and yes there was zero evap problems).
  • 20th of January, 2016, 2:42 p.m.
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Nov 26, 2012720 posts126 upvotes Published: November 26, 2012 20th of January, 2016, 2:42 p.m.

I’ve tried a number of other pumps, and the problem has just lately started to occur again.

I had the exact same issue.

The hissing sound that occurs when I open the gas tank cap is something I’ve noticed at times in the past.

Regardless, what I’ve been doing lately is opening the cap first to release the pressure, then closing it before driving to a gas station.

I hope that is of assistance.

Member of iGarageSr.

20th of January, 2016, 9:15 p.m.

My CEL has just come on, displaying the P0449 error code.

22nd of January, 2016, 11:37 p.m. The Deal Guru’s kenchau.com kenchau 10130 posts4126 upvotes on April 11, 2006 Mississauga 22nd of January, 2016, 11:37 p.m. Has anyone else noticed that the clips on the pumps have been reinstated?

P0449 Code: EVAP System Issue (Symptoms, Causes, and Fixes)

The most recent update was made on November 10, 2021. You certainly don’t want to see a check engine light when you’re driving down the road, do you? A check engine light can signify a serious problem in certain cases, but it can also indicate a small problem that you can handle yourself in others. Are you looking for a reliable online repair manual? The top five choices may be found by clicking here. But the good news is that you can read and clear that code with a little assistance, particularly when it’s a P0449 code.

We’ll address all of your questions, as well as a few others, right here.

What Does Code P0449 Mean?

On November 10, 2021, the most recent update was performed. When you’re traveling down the road, the last thing you want to see is the check engine light on. A check engine light can signify a serious problem at times, but it can also suggest a small problem that you can handle yourself at other times. Trying to locate an excellent internet repair manual? The top five choices may be found by clicking Here. There is good news in that you can read and clear that code with a little assistance, particularly when it is P0449.

We’ll answer all of your questions, as well as a few others, right here on our website.

Symptoms of Code P0449

A code P0449 is one of those uncommon engine codes that, other from the illuminated check engine light, normally manifests itself with no other symptoms. An stench of gasoline may be present in conjunction with code P0449 on occasion, however this is dependent on the specific reason of the code P0449 on your particular engine system. Typically, though, you will not have any visible symptoms other than the check engine light. Keep in mind, however, that any engine code associated with emissions will almost always result in a failure of an emissions test.

  • The check engine light is illuminated. An unsuccessful emission test
  • There are no observable conditions
  • Occasionally detectable gasoline odor

Causes of Code P0449

While there aren’t many symptoms associated with the code P0449, there are a plethora of probable reasons to consider. The most typical reason for this is a missing or damaged gasoline cap, but if you aren’t that fortunate, you’ll need to inspect around the rest of your car to see if any other components are damaged as a result of the problem. Code P0449 can be caused by a number of different things, including faulty vent valves, fuel tank filler necks, EVAP hoses, carbon canisters, gaskets, and gasoline tanks.

  • Misplaced fuel cap
  • Defective evaporative vent valve
  • Damaged fuel cap
  • Damaged filler neck on fuel tank
  • Damaged exhaust gas accumulator hoses. Defective fuel tank sending unit gasket or seal. Damaged carbon canister
  • Damaged fuel tank.

Is Code P0449 Serious?

Misplaced fuel cap; Defective evaporative vent valve; Defective evaporative vent valve; Damaged fuel cap; Damaged filler neck on fuel tank; Damaged exhaust gas accumulator hoses.

Defective fuel tank sending unit gasket or seal. Damaged carbon canister. Damaged fuel tank.

How to Fix

A code P0449 is one of the few engine codes for which you can typically identify the source of the problem simply by looking about — assuming you know where to look and what you’re looking for, that is. First and foremost, inspect the fuel cap. If it’s not there or has been wrongly installed, this is most likely the source of your problem. Take another check at the gasket, even if you think you’ve done everything right. If the gasket has been ripped or otherwise damaged, it must be repaired. If everything on the gasoline cap appears to be in working order, it is time to examine the other components of the system.

Otherwise, start with the most basic components to inspect.

It’s quite probable that the problem is with the rubber hoses itself if they’re dry decaying, cracked, or otherwise compromised.

After that, have a check around the gasoline tank.

After you’ve eliminated all of the potential problems, you may move on to the issues that are a bit more difficult to identify, such as a broken carbon canister or a faulty fuel sending unit or gasket.

If you can see that the gasket is frayed or otherwise damaged, that is the source of the issue.

The gasket or seal has to be replaced if you can feel air escaping from the machine while using it.

If you’ve done this, you’ve either missed the external damage or it’s an issue that can’t be diagnosed by merely looking at it.

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