Chevy Venture P0449: Vent Valve Solenoid – Circuit Malfunction

This is a common problem with the Chevy Venture Is the Code P0449. Refers to the number given when you connect it to an OBD2 scanner. This code P0449 refers to the evaporative emissions controller (EVAP). This code is often found with or related to P0420,P0446 and, very frequently, P0455.



The P0449 issue is not usually a threat to your Venture's driveability. Certainly anytime the service engine soon light is on, it’s good to deal with it as soon as possible though. You should also consider: Really good scanner It will let you know if your vent valve is functioning correctly. These scanners are available in most shops. There’s a link towards the bottom the page on exactly how to perform a quality diagnosis with a scan tool.


Índice de Contenido
  1. Chevy Venture P0449 Definition
  2. Chevy Venture P0449 OBDII Code Symptoms
  3. Venture P0449 Trouble code Causes
  4. Chevy Venture Diagnostics - P0449
  5. Most common P0449 fixes
  6. Are P0449 Serious Concerns?

Chevy Venture P0449 Definition

P0449 Chevy Venture

The universal OBDII code P0449 can be used to diagnose trouble codes. It means that no matter what make or model vehicle it is, P0449 will be the same code (Venture, or not), as long as the code was produced after 1996.

If P0449 is displayed, it means that either the valve or solenoid circuit controlling the evaporation system are not working correctly. Depending on your vehicle's model, the EVAP cycle fuel vapor out of the tank into an intake manifold. If the system fails to function properly, fuel vapor will not be removed.

ECM (Engine Control module) has identified a problem in the circuit that controls the vent which releases fuel vapor. Soon, the service engine will follow this up.


Chevy Venture P0449 OBDII Code Symptoms

P0449 OBDII Code Diagnosis Chevy Venture
The only indication that P0449 has been activated is the soon-lit service engine.

The P0449 code is usually not accompanied with any other symptoms than those listed. Smells like gas And the service engine soon light. It is possible to notice a slight dip in fuel economy.

The fuel tank and fuel filler tubes should smell particularly strong.

The EVAP system is responsible for fuel vapors. If these vapors are leaking from the system, you’ll often smell them faintly while operating the vehicle.


Venture P0449 Trouble code Causes

The P0449 code can be triggered by many factors in Chevy Venture. These are some of the more common issues that can trigger the P0449 code. Here's a video explaining the process.


  • Fuel Cap– A bad fuel cap can cause the code to be thrown for sure. Often, you’ll get a message informing you that the fuel cap is off even when it is on. You may not need to spend a lot of money replacing the fuel cap if you get this message. fuel cap See if the problem goes away.
  • EVAP System Hose– The hose that carries the fuel vapor from the fuel tank to the intake manifold can begin to leak. The P0449 code will be generated. It should have a tear or a hole. This is the main reason for this code. Without a smoke test, it can be difficult to locate the hole.
  • Vapor Canister Purge Valve– One of the most common causes of the P0449 code is the vapor canister purge valve. It’s really easy to replace. You will need to locate and take out a few clips. Here’s How to check a purge device (YouTube).
  • Wiring and Fuse Problems– If the wiring going to the valve has been compromise, it’ll lead to the P0449.
  • Fuel Tank Sending Unit– It is possible for the gasket that attaches the fuel sending unit to the gas tank to go bad. This could reduce the pressure in your tank and cause you to lose the code. This is not the right place to begin.
  • Fuel Filler Neck– There is often a gasket where the fuel filler neck connects with the gas tank. It is possible for this gasket to dry, particularly if vehicles spend a lot of time in dry environments. When it dries out, the fuel tank can’t hold pressure anymore, it may erroneously throw P0449.


Chevy Venture Diagnostics - P0449

To diagnose the problem with your Chevy Venture's P0449, a mechanic will have a variety of tools at his/her disposal. The most commonly used methods to diagnose this code are:

  • To ensure that the cap can withstand pressure, the mechanic will check it. If you are getting a warning that your gas cap is off, even when it’s on, replacing it will more than likely clear this code.
  • The mechanic will usually check for additional codes. A mechanic will usually check for additional trouble codes to help diagnose the problem. That’s because when they appear together in certain combinations, there will often only be only a few conditions that will throw any combination of codes at one time.
  • Once the mechanic has determined the trouble codes associated with P0449, he or she will usually Check out the EVAP System. These include the line and purge valve.
  • Monitoring and checking the fuel tank pressure is a must.
  • After for the checks and fixes listed above, the mechanic will perform two tests: A smoke test, and they’ll use a scan tool to confirm that the EVAP solenoids and valves are operating properly.

Have you got trouble with your computer? Here’s a Super technical video This is a great article on how to diagnose P0449.


Most common P0449 fixes

P0449 Code Fix Chevy Venture

These are some of the most popular Venture P0449 fix:

  • Replacing the gas cap
  • Replacing a EVAP line
  • Vent valve replacement
  • Wiring repair

It is best to begin with the gas cap, and then work your way up to the fuel tanks. The gas cap is the most difficult and cost-effective item to replace.

Here’s a great video on How to check your gas cap.

You will need to solve the problem that caused your Chevy Venture's P0449 code. This should help. Please feel free to add anything below.


Are P0449 Serious Concerns?

While P0449 is not going to cause the Venture’s engine to stop running, it should not be treated lightly. There could be fuel contamination. Check your fuel level to make sure it is not leaked. It is best to have it checked and/or dealt with immediately.

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