P0449 Code Meaning, Symptoms, Causes, Repair Cost, How To Fix?

What if you’re all ready for the important office meeting and suddenly there is a trigger for the P0449 code on your dash. Nothing can be more frustrating than this type of problem. It can be quite frustrating when it comes to dealing with those car problems and their repairs.

However, it can get even more frustrating when you don’t know the reason behind what is wrong with your vehicle. In this article, we’ll be discussing this trouble code in detail.

What Does P0449 Code Mean? 

When the trouble code P0449 appears on the dash of your vehicle. This is an indication of the EVAP system vent valve solenoid malfunctioning. Which results in more hydrocarbons being expelled into the atmosphere.

The Evaporative Emission Control (EVAP) System seals the fuel system of the vehicle. In order to prevent fuel vapors from the fuel tank and fuel system from escaping into the atmosphere.

Hydrocarbons create smog when they react with air and sunlight. Gasoline evaporates very quickly, so if the fuel system is open to the atmosphere, a vehicle can pollute 24 hours per day without even being turned on.

Hence, the ECU detects this fault and causes the Check Engine Light to be illuminated on the dashboard.

Symptoms of Code P0449?

A code p0449 is one of those rare engine codes that usually don’t have any additional symptoms besides the check engine light. Occasionally you’ll have a fuel odor accompanying a code p0449, but that depends on the exact cause of your particular engine code.

Usually, though, you won’t have any noticeable symptoms besides the check engine light. However, keep in mind that any emissions-related engine code will usually cause you to fail an emissions test.

What Are The Causes Of This Trouble Code?

The following are some basic causes of the p0449 code.

1. Damaged Or Loose Gas Cap:-

It is the most common reason. If your gas cap is loose or damaged, you will likely lose fuel economy because the evaporative emission control system could get damaged. This can happen when unburned fuel in your car’s engine escapes out of the filler neck and into the atmosphere, which has harmful environmental effects.

2. Defective EVAP Canister Vent Control Valve:-

A vapor canister purge valve i.e. purge valve solenoid or EVAP purge solenoid is an important emissions control component. If it were to fail, excess fuel vapor and emissions would be released into the atmosphere instead of being purged back into the engine.

3. Damaged Charcoal Canister:-

A damaged or clogged charcoal canister will prevent fuel vapors from being purged. Instead, the gases will be released into the atmosphere as harmful emissions. A faulty charcoal canister, or one that’s been contaminated by gasoline, can result in a fuel smell inside or around the car.

4. Defective Or Damaged Fuel Tank:-

Damage to your vehicle’s fuel tank can be dangerous if it causes a fuel leak. You might also find that the fuel gauge doesn’t work, the fuel lines leak, or the gas cap becomes cracked and doesn’t seal properly.

5. Vent Control Valve:-

A faulty vent control valve can seal the fumes inside with nothing to move them, or the vent control valve can’t maintain enough pressure to keep sealing the vapors in at all.

6. EVAP System Hoses:-

If this trouble code appears the pressure can also leak from the hoses in the EVAP system. A smoke test can diagnose this issue.

7. Electrical Connections:-

Vehicles run on electrical connections, just like computers. A shorted or open electrical connection affects the EVAP system.

8. Fuel Sending Unit Gasket Or Seal:-

This gasket or seal ensures that the fuel stays in the unit and doesn’t drift elsewhere in the vehicle. Even if fuel doesn’t leak, the pressure may weaken.

Hence, these are some causes of the EVAP system vent valve solenoid malfunctioning.

How Serious Is This Code?

P0449 is an emissions control code and will cause the vehicle to fail OBD2-based emissions. Other than failing the emissions the fuel odor may bother some drivers. This code should not prevent normal vehicle operation but should still be repaired ASAP.

How To Fix The Issue Of This Trouble Code P0449?

If you’d like to try to fix the p0449 code at home without throwing money at parts, you’ll want to follow the steps below for a proper diagnosis.

Step 1:-

Inspect your gas cap to see if it is loose or damaged. If your gas cap is loose, tighten it and clear the code. Inspect your gas cap for physical damage or deterioration. However, it should be noted that damage to the gas cap or deterioration of its components is not always noticeable. But even if you’ve correctly installed everything, take a look at the gasket if it’s torn or damaged, you’ll need to fix it.

Step 2:-

If everything on the fuel cap looks correct, it’s time to check out the system’s other components. If you can smell fuel, track it down to the source, and you’ve likely found your problem.

Step 3:-

If the fuel cap didn’t fix it, perform an EVAP system leak check. To do this, pinch off the vent tube to the EVAP Vent Control Valve. Pressurize the EVAP system with an EVAP smoke machine leak checker. Check to see if you see any smoke leaking out from any hoses or seals. If there are any leaks, repair leaks and check to see if the concern is resolved.

Step 4:-

Take a look at the fuel tank filler neck it should be flush against the fuel tank and it shouldn’t have any cracks or damage. Next, look around the fuel tank. If the tank itself is dented, cracked, or damaged, this might be your problem.

Step 5:-

If you can see that the gasket is fraying or damaged, that’s your problem. Also, feel around the gasket area when the engine is running. If you can feel air escaping the unit, it’s time to replace the gasket or seal.

Step 6:-

If at this point the vehicle is still setting the same code, you may have an electrical problem and will need to bring it to a shop to have further diagnostic work performed.

Hence, these are some steps through which you can try to fix this trouble code issue properly.

How Much Does It Cost to Fix Code P0449? 

If you take your car to a shop for diagnosis, depending on the shop’s labor rate, this typically costs somewhere between $75-$150. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you. From there, a shop will be able to give you an accurate estimate for repairs to fix your code p0449. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair.

1. Gas Cap $20-$60

2. EVAP Line $20-$100

3. EVAP Vent Control Valve $150-$200

4. Purge Volume Control Valve $150-$200


We hope the above-mentioned information about the p0449 code will be helpful to all the readers. If anybody’s doubts persist feel free to comment in the comment section below. We’ll try to solve your doubts as soon as possible.

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