P0449 Equinox? (Perfect answer)


  • A very common issue with the Chevy Equinox is the P0449 code. This trouble code is a reference number that is given to you when you plug your Equinox into a OBDII scanner. P0449 deals with the evaporative emissions control system. It often appears with, or is related other codes, such as P0420, P0446, and very often P0440.

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.

Can you drive with P0449?

Code P0449 Severity – Low 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 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.

How do I fix a solenoid circuit malfunction?

To fix this error code, check the fuses and see if there’s a fuse that powers the vent solenoid. Look for chafed or rubbed-through wiring harness. Take a look at the wires and make sure they’re not shorted to each other, to power or ground. Inspect the vent valve; look for cracks or any signs of damage.

Where is the 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.

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.

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 is a P0452 code?

When the Engine Control Module (ECM) purges the stored fuel vapors the pressure goes down. When code P0452 is triggered the ECM has detected an abnormally low voltage for an extended period of time. This can be caused by a faulty sensor, wiring or an EVAP system leak.

What is the code P0442?

What Does Code P0442 Mean? The evaporative emission control (EVAP) system prevents fuel vapors from escaping into the atmosphere. If the EVAP system does not maintain the pressure, the ECM recognizes an evaporative emission control leak. In the case of P0442, it is a medium-sized leak, between.

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.

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.

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 EVAP vent solenoid control circuit?

Its definition is “Evaporative System Vent Control Circuit Malfunction.” The code P0449 is set when your car’s primary computer, the powertrain control module or PCM, detects that the actual state of the Evaporative Emission Control System vent valve doesn’t match the desired state for a specific amount of time.

What is a vent solenoid?

The Vent Solenoid is a normally open valve that is commanded closed to seal the EVAP system and stop air flow into the charcoal canister. The Purge Solenoid is normally closed but is opened by the PCM to allow manifold vacuum in the EVAP system — thus drawing fuel vapours from the EVAP system.

What is a EVAP canister vent control valve?

The purpose of the canister vent valve, also called simply the vent valve, is to control the flow of air into and out of the Evaporative Emission Control (EVAP) system, a feature on all modern cars. The EVAP system collects and stores fuel vapors in a charcoal canister.

Chevy Equinox P0449 Code Diagnosis: EVAP System

TheP0449 error code is one of the most often encountered problems with theChevy Equinox. An OBDII scanner will detect this fault code and provide you with a reference number when you plug your Equinox into it. Specifically, P0449 is concerned with the evaporative emissions control system. It is frequently found in conjunction with or connected to other codes, such as P0420, P0446, and, less frequently, P0440. Misalignment of the Vent Valve/Solenoid Circuit in the Evaporative Emission Control System (P0449).

However, it can be.

Additionally, a high-quality scanner can assist you in determining whether or not the valve is performing properly.

There is a link at the bottom of the page that explains how to go about performing that operation.

Chevy Equinox 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 (Equinox 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.

Chevy Equinox 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.

Equinox P0449 Trouble Code Causes

There are a variety of factors that might cause the P0449 error code to appear in your Chevy Equinox’s computer system. 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, it may save you a great deal of time and money to simply replace the fuel cap and see if the problem is resolved. 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 results in the code being generated
  • 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 wire — If the wiring leading to the valve has been compromised, the P0449 code will be displayed. 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 might cause tank pressure to drop, resulting in the code being generated
  • Fuel Filler Neck – A gasket is usually present where the fuel filler neck interfaces with the gas tank. 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.
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P0449 Diagnosis- Chevy Equinox

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 Chevy Equinox.

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

The following are the most often encountered Equinox P0449 issues:

  • 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. Hope you have success in determining what is causing your Chevy Equinox to display the P0449 error code. 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?

While P0449 will not cause the Equinox’s engine to shut down, it should not be taken lightly and should be investigated further. 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 Equinox

If you detect a P0449 Equinox problem, here’s what you should do next. There is a problem with the vent solenoid or the circuit to the vent solenoid when the P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit error code is shown. Don’t just assume that you have a faulty vent solenoid without
checking it out. First, make sure the circuit is working properly. Here’s how it works:

P0449 Circuit Description

The battery voltage is supplied to the charcoal canister vent solenoid valve, which controls the EVAP emissions (for more information on EVAP systems, see this post). It grounds the vent solenoid valve when the engine control module (ECM) runs a purge cycle to remove gas vapors from the charcoal canister during the purge cycle. Disconnect the harnessEquinox P0449 when the ignition is turned off. Vent solenoid wiring schematic (see diagram below)connector at the vent solenoid valve (see diagram below) Then flip the IGN switch to the ON position.

  1. Alternatively, if you do not detect battery voltage on terminal A, you should inspect the underhood fuse box for a blown F24UA 10A fuse.
  2. There have been reports of wiring difficulties on the power side of the circuit, close to the vent solenoid connector, in some places.
  3. The shop handbook then instructs the technician to turn on the exhaust valve.
  4. If the ECM grounding test indicates that the problem is with the vent solenoid valve, the problem is with the vent solenoid valve.

It should be replaced. It’s on the charcoal canister, to be precise. The position of the vent solenoid Rick Muscoplat’s Equinox painting from 2018. Rick Muscoplat posted a blog entry on

P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

Article written by Mika, also known as thefordmaniac. Inability to operate the Evaporative Emission Control System Vent Valve/Solenoid Circuit

What does that mean?

This code is a general powertrain code that may be found on many vehicles. In this case, the term ‘generic’ refers to the fact that it applies to all makes and models of automobiles (1996 and newer), albeit precise repair processes may differ depending on the model. Powertrain Control Module (PCM) / Engine Management Computer (EMC) / Engine Control Module (ECM) has discovered a problem in the circuit that controls the vent for evaporative emission systems vapor. The fault has been isolated and is being investigated.

When the vehicle is in motion, this vent opens and allows the vapors to be routed into the engine intake manifold, a charcoal canister, or the atmosphere.

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In addition to Malfunction Indicator Lamp (MIL) lighting, you will most likely not notice any additional symptoms if your computer has a P0449 error code.


The following are examples of possible causes:

  • A faulty vent valve
  • A problem with the wires or circuits
  • A problem with the PCM, EMC, or ECM

Possible Solutions

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).

  • Alternatively, a bulb linked to both terminals will light up when power and ground are satisfactory, if you do not have access to an advanced level scan tool.
  • If the resistance reading is high, replace the vent.
  • This code appears to be common on Dodge, Chrysler, and Jeep products.
  • In some instances, the vent valve was malfunctioning.
  • Finally, if you remove the valve, you may be able to see the pintle within, which may or may not be stuck owing to residual gasoline.
  • In addition to P0440 through P0441, there are also P0442 through P0443, P0444 through P0445, P0446 through P0447 through P0448, P0452 through P0453, P0455 and P0456.

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P0449 Engine Code – Diagnosis & Troubleshooting – EVAP System Failure

Evaporative Emissions Control System (EVAP) is the abbreviation for the Evaporative Emissions Control System, and the P0449 engine code is related to it. In order to prevent gasoline vapor from being discharged into the atmosphere, the EVAP system absorbs it from the fuel tank. This reduces the amount of pollution that is emitted into the environment. The method gathers gasoline vapors through the use of a canister that contains activated charcoal. They are subsequently sent to the Chevy’s intake system, where they enter the engine and are burnt off during the engine’s combustion cycle.

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Understanding the EVAP System Components

Your Chevrolet’s gas tank is equipped with vent lines that link to the EVAP canister, which is often located below the car, near the gas tank, for proper ventilation. A vent valve/solenoid is attached to the canister, and it is responsible for allowing outside air into the canister in order to dilute the gasoline vapors before they are sent to the engine. After filling the canister to capacity with vapors, the vapors are expelled from the canister using purge lines. Afterwards, the purge lines are connected to a purge valve/solenoid, which is typically positioned behind the throttle body in most cases.

Typically, when you have an EVAP failure, it is due to a malfunctioning purge valve or a malfunctioning vent valve (also called solenoids).

What Happens When EVAP Fails?

P0449 engine code indicates that the vent valve has failed, which is the most common cause of this code. When a valve breaks, it usually fails open rather than closed. When this occurs, the gas vapors are discharged into the atmosphere rather of being used to fuel the engine as originally intended. Additionally, the purge valve can become jammed open, which can result in a vacuum being created and vapors being drawn into the intake system on a continual basis, resulting in some performance concerns.

EVAP Failure Symptoms

  • Engine codes P0449, P0440, P0441, and P0446 are shown. Unsatisfactory idle
  • Air-to-fuel ratios that are out of specification
  • In rare circumstances, it is difficult to get the engine started.

It is possible that you will not notice any symptoms if you have a little leak. While the problem might create some performance concerns when using AFRs, it is typically not severe enough to cause catastrophic engine damage in most instances. In general, the engine code is the most straightforward method of identifying the problem.

How to Fix a P0449 Engine Code – Chevy

When you receive a P0449 error number on your Chevrolet, the most common reason is a faulty vent valve that has become jammed open. If this occurs, you will need to replace the whole canister, which includes the vent valve, as well as the vent valve assembly. One further potential source of failure is the purge solenoid, which I’ve provided a photo of below. Additionally, a faulty gas cap might result in this code being displayed. It’s possible that the ‘check gas cap’ light will illuminate on your dashboard from time to time if this is the case.

Taking your vehicle to a repair shop or dealer to have them diagnose and repair the problem will cost between $200 and $250.

The following is a photograph of the canister for a 2005 Chevrolet Tahoe: Additionally, the problem might be related to the purge valve or solenoid, which is located behind the throttle body and is causing the difficulty. The following is a photograph of a Chevrolet purge valve solenoid:

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P0449 – Meaning, Causes, Symptoms, & Fixes

Vent Control Circuit Failure in the Evaporative System (EVAP)

Code P0449 Meaning

The Evaporative Emission Control (EVAP)System of a vehicle seals the fuel system in order to prevent fuel vapors from the fuel tank and fuel system from leaking into the atmosphere while the vehicle is running. The reason for this is because gasoline vapors include a wide range of hydrocarbons. In the presence of air and sunshine, hydrocarbons react and produce smog. Because gasoline evaporates fast, if a vehicle’s fuel system is exposed to the atmosphere, it can harm the environment 24 hours a day, seven days a week without ever being used.

Symptoms of Code P0449

  • The Check Engine Light is illuminated. There are no discernible drivability concerns
  • Stench of fuel vapor

Causes of Code P0449

  • Damaged/defective gas cap
  • Missing gas cap
  • Damaged/defective gas cap
  • Torn/damaged EVAP system hoses
  • Faulty electrical connection
  • Damaged carbon canister
  • Damaged/defective fuel tank
  • Damaged/defective evaporative vent valve

Code P0449 Severity – Low

Code P0449 does not represent a major threat to the driver or the vehicle, and it is unlikely that any drivability concerns will arise as a result of the code.

However, as is the case with other Check Engine Light codes, it should be addressed as quickly as possible in order to avoid any more damage to your car.

Code P0449 Common Diagnosis Mistakes

Replacing the gas cap without first ensuring that the EVAP vent valve solenoid is operational.

Code P0449 Diagnosis Steps

  1. Incorrectly removing and replacing the gas cap without first inspecting the EVAP vent valve solenoid
  1. If your gas cap is loose, tighten it to clear the code
  2. Otherwise, repeat the process. Inspect your gas cap for physical damage or degradation, and replace if necessary. Although it should be noted that damage to the gas cap or degeneration of its components are not usually visible, they do occur occasionally. If your gas cap was not loose and you do not detect any signs of failure, you should replace the gas cap regardless of whether or not the codes were set. Gas caps are extremely affordable and are frequently used to resolve the problem with code P0449.

Check any damaged or disconnected exhaust gas accumulator (EVAP) hoses near or attached to the engine air intake. Check any damaged or disconnected exhaust gas accumulator (EVAP) hoses near or linked to the engine’s air intake system.

  1. Check any damaged or disconnected exhaust gas accumulator (EVAP) hoses near or linked to the engine’s air box.

You may need to take your vehicle to a repair if these techniques do not completely remove the Check Engine Light. This is because there may be internal electrical concerns.

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