Chevy Trax P0449: Vent Valve Solenoid – Circuit Malfunction

This is a common problem with the Chevy Trax The Code P0449. The code refers to a number you receive when your OBD2 scanner scans it. 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.



Normally, P0449 does not pose a danger to your Trax'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 This scanner will allow you to determine if the vent valve operates correctly. This scanner is common in 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 Trax P0449 Definition
  2. Chevy Trax P0449 OBDII Code Symptoms
  3. Trax P0449 Troublecode Causes
  4. P0449 Chevy Trax Diagnosis
  5. Most common P0449 fixes
  6. Do you consider P0449 to be a serious concern?

Chevy Trax P0449 Definition

P0449 Chevy Trax
P0449 stands for a universal OBDII Trouble Code. The code can be used to indicate the same things regardless of the make and model of the vehicle (Trax or no Trax), as long it was produced after 1996.

If P0449 is displayed, it means that either the solenoid circuit or the valve 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 Modul) detected a fault within the circuit controlling the vent to release fuel vapor. Soon, the service engine will follow this up.


Chevy Trax P0449 OBDII Code Symptoms

P0449 OBDII Code Diagnosis Chevy Trax
The P0449 code is usually triggered by the service engine soon lamp.

A P0449 Code will not usually be associated with other noticeable symptoms. Smells like gas And the service engine soon light. It is possible to notice a slight dip in fuel economy.

Particular attention should be paid to the fuel tank or fuel filler tube smell.

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.


Trax P0449 Troublecode Causes

P0449 can trigger your Chevy Trax's trouble code. Below are some common causes of this code, along with great videos.


  • 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. It may be worth your time to get that message and a P0449 to help you replace it. fuel cap Try it and let us know if you get rid of it.
  • 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'll need to identify and remove 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 shouldn't be where you start.
  • Fuel Filler Neck– There is often a gasket where the fuel filler neck connects with the gas tank. The gasket may dry out especially if the vehicle is in dry conditions. When it dries out, the fuel tank can’t hold pressure anymore, it may erroneously throw P0449.


P0449 Chevy Trax Diagnosis

The mechanic can use a range of instruments to determine the cause of your Chevy Trax P0449. These are some of the common diagnostics that can be done for the code

  • A mechanic will examine the gas cap and verify that it is able to withstand high pressure. 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 check to make sure there are no other codes. It is easier to diagnose problems if there are more codes. 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 Take a look at the EVAP system. It includes the purge valve and line as well as the canister.
  • 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.

Are you still having problems? Here’s a Super technical video This is a great article on how to diagnose P0449.


Most common P0449 fixes

P0449 Code Fix Chevy Trax

Below are the most commonly used Trax P0449 Fixes:

  • Replacement of gas cap
  • Replacement for EVAP lines
  • Vent valve replacement
  • Wiring repair

You should start with the gas caps and move on to the fuel tanks. This is because the gas caps are the easiest to replace and the least costly.

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

You will need to find the cause of your Chevy Trax throwing the P0449 code. We trust this helped. Please feel free to add anything below.


Do you consider P0449 to be a serious concern?

While P0449 is not going to cause the Trax’s engine to stop running, it should not be treated lightly. There could be fuel contamination. Check your tank regularly to make sure there is no fuel leaking. You should immediately take it in for repair or replacement.

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