p0455 chrysler voyager

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P0455 evap leak large engine light

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On my 2001 Chrysler Voyager, 6 cylinder, my engine light is on and it says P0455. Autozone said it means you have a large evap leak. I changed out the gas cap and re-tightened it and shut off the codes but the light came back on again. I've read somewhere were the tubing could have eroded on this system somewhere and to have it checked. Where can I follow the line to see where I'm having problems? On one of the threads, it says underneath the air filter. Any help would be appreciated. Dugan  

It's probably one of the vacuum line to the charcoal canister purge valve. The purge solenoid is located on the right side of the engine compartment near the radiator. The charcoal canisters are located under the vehicle near the frame rail under the driver's side. There are two of them.  

Hi I replaced the 2 little hoses under the air box and every thing was fine. Today code p0455 showed up. I was wondering what the hose size is at the purge solenoid. It looks like the 2 pipes go into a one piece hose. Can I use 2 hoses on it? Great site by the way. John  

SuperJETT, Looks like you are going to be having a rear heater line failure in the very near future. It looks like you are starting to leak allready. Might want to get on that one because it will go fast!  

Can you point it out to me on the pic?  

Rusted heater pipes, behind the exhaust. -Jim  

I was talking about the 'starting to leak already' part. I see the rust, but not a leak, though I did add some water to the radiator a couple of weeks ago. Maybe I should pay closer to attention to it for a bit...  

The bottom of the lines are wet and everything else on the van is dry. Probably just seeping now but they fail in a big hurry without warning. One day they are damp and the next day you are on the side of the road.  

I had this problem. There are several hoses that you can access by jacking up the Van and looking underneath the drivers seat. There's a plastic box with several rubber hoses. One of mine corroded out. I took the old hose to the dealer, got a replacement for less than $10, reset the check engine light, and was good to go. I you have this code, this should be the first place to look.  

How do you reset the check engine light?  

Large evaporative leak Well I had the more expensive part go bad. I took all of the hoses off and pressure tested them under water and they were all good. I eventually went to a mechanic and had him do a smoke test ($60) My fuel filler neck was rusted and smoke was pouring out of the gas cap area. $190 for a new one at the dealer - ouch!! It took about an hour to take the old one out and about 10 minutes to put the new one it. A fairly easy job. I cleared the codes and now just have to drive it around for a few weeks to keep the computer happy.  

do know the name of this black box?  

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What you NEED to know about P0455 and how to FIX it! (EVAP)

The check engine light is a bummer to all vehicle owners. As soon as that light illuminates, it can be game over for some.

Finding out that your vehicle has diagnostic trouble code P0455 can result in a costly repair.

In this article, we will look at what it takes to fix that fault code and what the mechanic sees with his or her scan tool.

The evaporative emissions system can be a common problem among many vehicles. An EVAP code can illuminate the check engine light for a small leak, a large leak, or a component failure.

A common code that pops up in vehicles is the code P0455.

From leaks in EVAP hoses to component failures, we will find out what can cause the P0455 trouble code.

What does P0455 code mean?

The P0455 fault code indicates a large leak in the EVAP system. (Evaporative Emissions System)

This could also be stated as a "gross leak".

This fault code may lead you down the wrong path if not diagnosed properly. In some cases, a P0455 code can be an EVAP vent valve that is stuck open. This will not allow correct vacuum in the EVAP system while the engine control module is performing a leak test.

During a leak test, the engine control module monitors the fuel tank pressure sensor for changes in pressure. If an EVAP vent valve is stuck open, then the EVAP system can not properly seal itself, thus not being able to hold a vacuum.

If your system does not have a large EVAP system leak, then it may be a component failure.

The above picture is an EVAP vent valve .

What would cause a large EVAP leak?

Large EVAP leaks can be caused by an actual leak in the EVAP system or a failed component.

Leaks can be found in the plastic or rubber hoses that are used in the EVAP system. Some leaks can be caused by physical damage from road debris.

Some other leaks can be from the fuel filler cap, gas tank, or charcoal canister (EVAP canister).

Possible causes of failed components that cause the code P0455 are:

Bad Vent Control Valve (Vent Valve)

Lack of purge flow - This can be caused by a bad purge valve.

Incorrect pressure data - The engine control module (ECM) monitors the fuel tank pressure sensor voltage for leaks. If the fuel tank pressure sensor is sending the incorrect voltage, the ECM can misinterpret the data as a leak.

How do I fix code P0455?

The best way to fix a P0455 is to have the right diagnostic process to get to the root cause of the problem.

This is what most mechanics do to test for EVAP codes.

Have a visual inspection of every component and hose to make sure they are in good condition.

Bi-directionally control each component with a scan tool to ensure proper function.

Do a manual EVAP test with your scan tool.

Perform a smoke test if a leak is suspected.

Is it safe to drive with code P0455?

It is important to properly diagnose the code P0455 and repair it soon. The vehicle may stop monitoring and testing other codes if P0455 is present.

A large fuel vapor leak may be present in the Evaporative Emission System (EVAP) which is not ideal for driving a vehicle.

Can a gas cap cause a large EVAP leak?

Yes, if a gas cap is severely damaged or has something that keeps it from sealing properly, then it can cause a P0455 code.

A bad gas cap has to be replaced with a new gas cap if the gasket on it is not sealing properly.

In some cases, a loose fuel cap will cause a small EVAP leak, but sometimes the tether that attaches the gas cap to the vehicle can obstruct the gas cap from closing fully. Check out the photo below for an example of a gas cap tether not allowing the gas cap to seal all the way.

How much does it cost to fix code p0455?

Fixing a P0455 can cost anywhere between $20 - $250 to replace an EVAP vent valve.

This price is depending on if you replace it yourself and the price of your specific vehicle's part.

When using an auto repair shop, the price will go up due to labor costs.

There are benefits to using an auto repair shop. For instance, warranties are usually issued by the auto repair shop if the part that was replaced was defective. The auto repair shop will usually take its time to properly diagnose the issue in order to repair the problem the first time. This can save you money in the long run.

If you decide to repair it yourself, there is an online resource I use on every vehicle, which is AlldataDIY .

AlldataDIY has all of the repair information for your vehicle. It also has wiring diagrams and technical service bulletins.

Repair your car the right way with AlldataDIY.

How do you find a large EVAP leak without a smoke machine?

A large or small EVAP leak can be very difficult to find without doing a smoke test. A smoke test will reveal the leak much faster than any other method.

Other proper equipment is needed to perform a smoke test, like an advanced scan tool. Having a sealed EVAP system is ideal for performing a smoke test. A scan tool is needed to fully seal the system. Rubber plugs may be able to do the trick too, if placed properly.

Other leak tests are possible, like using CO2 to fill the EVAP system and using a CO2 detector to find the leak.

Smoke machine

How serious is a large EVAP leak?

An EVAP large leak can be a serious issue in vehicles. In some cases, the EVAP leak can be located inside the vehicle. This allows fuel vapors to be inside the vehicle, which is not ideal.

Check out this case study of a Subaru with a DTC P0455. It was found that the leak detection pump was leaking and allowing fuel vapors to leak into the cabin of the vehicle.

Different monitors and tests performed by the ECM are put on hold when the P0455 code is active. There may be another issue with the car revealed once all of the monitors have run.

Without the other monitors and tests running, there may be an issue that affects fuel economy also.

For instance, check out this case study of a Ford Mustang that had an EVAP purge valve issue. The purge valve was not sealing properly and allowing fuel vapors into the engine at the incorrect time. This caused the Mustang to have a "rich" condition and a code P1450.

It's best to have the P0455 issue resolved so that the vehicle can run through all of the monitors and tests that it needs to operate efficiently.

If you have found a leak or a component that has failed on your vehicle and repaired it, the vehicle will have to go through a "drive cycle" to run all of the tests and monitors. In some instances, it can take a long test drive or several test drives for the EVAP monitors to run. This is why when you clear an EVAP leak code, it takes days for it to come back on.

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P0128 - What it means (and How to fix it)

Is your evap vent valve the problem (how to find out).

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P0455 Code: Causes, Troubleshooting, and Repair

As a car enthusiast or a DIY mechanic, you may have come across a P0455 code during a diagnostic scan. It's important to understand what this code means and how to address the underlying issue to keep your vehicle running smoothly. In this comprehensive guide, we'll explain the P0455 code, its common causes, and provide troubleshooting and repair tips to help you resolve the issue.

What is the P0455 Code?

The P0455 code is an OBD-II (On-Board Diagnostics) trouble code that indicates a large leak in the Evaporative Emission Control (EVAP) system. The EVAP system is responsible for controlling the release of fuel vapors from your vehicle's fuel tank into the atmosphere. When functioning properly, the system captures these vapors and sends them to the engine to be burned during combustion. Read this article to learn more about the EVAP System: What is the EVAP System and How Does it Work?

A P0455 code is triggered when the Powertrain Control Module (PCM) detects a large leak in the EVAP system, typically greater than 0.080 inches in diameter. This could result from a loose or damaged gas cap, cracked or disconnected hoses, or other issues within the system.

Common Causes of the P0455 Code:

There are several factors that can cause a P0455 code. Some of the most common causes include:

• Loose or damaged gas cap
• Cracked or disconnected EVAP hoses
• Damaged or faulty EVAP canister
• Malfunctioning purge valve or vent valve
• Issues with the fuel tank or fuel filler neck

Troubleshooting and Repairing the P0455 Code:

To address a P0455 code, follow these troubleshooting steps and tips:

• Check the gas cap: The first and simplest step is to inspect the gas cap. Ensure it is properly tightened and in good condition. If there are any signs of damage or wear, replace the gas cap.
• Inspect the EVAP hoses: Look for any visible signs of damage, cracks, or disconnections on the EVAP hoses. Replace or reconnect any damaged or disconnected hoses.
• Test the purge and vent valves: Use a multimeter to test the electrical connections and functionality of the purge and vent valves. If any issues are found, replace the faulty valve.
• Use a smoke machine: To identify less obvious leaks in the EVAP system, using a high-quality smoke machine like the AutoLine Pro automotive smoke machine is highly recommended. This machine will allow you to efficiently locate any leaks within the EVAP system, air intake system, exhaust system, turbo, and more.  For more information about smoke testing, here is an article about h ow to Smoke Test EVAP System to Diagnose a Leak.
• Inspect the fuel tank and filler neck: Check the fuel tank and filler neck for any signs of damage or corrosion that could lead to leaks. If any issues are found, repair or replace the faulty components.

Conclusion:

The P0455 code can be caused by various factors, but with proper troubleshooting and repair, you can quickly identify and resolve the issue. Using a high-quality diagnostic tool like the AutoLine Pro automotive smoke machine can greatly assist in finding and addressing leaks in your vehicle's EVAP system and other closed systems. Remember, regular maintenance and staying vigilant with potential issues can help prevent more severe problems and keep your vehicle running smoothly for years to come.

Our automotive smoke machines come in different tiers. They are  fit for all levels of mechanic, from the DIY auto enthusiast to the professional shop owner. Click here to find out which automotive smoke machine is the best fit for you .

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P0455 Code: EVAP System Large Leak Detected (Causes & Fixes)

Every modern vehicle has many sensors that monitor the overall work of the systems and components. When the engine control module detects a wrong value during testing or measurement, it sends a fault code. There are hundreds of different codes and it is difficult for a driver to understand them. The P0455 is just one of the engine codes that needs decoding.

The P0455 code is a result of a large leak in an Evaporative Emissions Control System (EVAP). The purpose of that system is to keep the fuel fumes inside the fume lines. If there is a leak in the system, the fumes will end up in the atmosphere causing additional pollution.

There are several error codes that are a result of an EVAP leak. The P0455, unlike the P0442 code which is a sign of a smaller leak, shows a massive EVAP leak. They can be a sign of leaks in multiple places in the system. Often the only visible sign for this error is a check engine light. To learn how to manage this error, stay with us.

Understanding the P0455 OBD2 Code in Layman’s Terms

Every car has an EVAP system. Its purpose is to stop the fuel vapors from exiting into the atmosphere. This system is essential in lowering the emissions of every vehicle. The EVAP system works closely with the fuel system to maintain the emission levels low. 

Besides the regular parts of the fuel system, like fuel lines, and a fuel tank, there are several critical parts of the EVAP system. Those are the EVAP canister (charcoal canister), the canister purge valve, and the EVAP hoses and lines. 

Vent lines from the fuel tank pass the fuel fumes to the EVAP canister. In the EVAP canister are charcoal pellets. Fuel fumes are stored in those pellets until the engine is started. After starting and warming the engine, the canister purge valve opens the EVAP canister and releases the fumes. They are moved into the engine intake manifold. There the fumes are burned with the rest of the air/fuel mixture.

The Basics of OBD and Error Codes

The need for standardizing error diagnostic and detection has existed for decades. Some manufacturers design their diagnostic systems. The OBD system is the first to bring standardization into this area. From 1996, every vehicle in the US has to have an OBD system of diagnostic code .

Since then, the system has had a revision called an OBD-II system. Today, with the help of an OBD-II scan tool, every driver can scan their vehicle. This system made error detection much easier since almost every component has its sensors.

When the car’s computer detects a strange value, it will send an error message. After scanning with the OBD-II scanner, it will show errors. With some help, anyone can know what part of the vehicle has a problem.

Decoding the P0455 Code: What It Means for Your Vehicle

The P0455 error code is one of those codes that don’t come with performance issues . The vehicle will run as usual, with the possibility of a small decrease in fuel economy. The biggest impact of a problem with an evaporative emission control system is the rise of bad emissions.

Common Symptoms of a P0455 Code Issue

The list of symptoms is not long, but that is not a reason to ignore this problem. It can be hard to detect this problem, so pay attention to these symptoms:

• Check engine light will turn on
• There will be an increase in fuel consumption
• The car will fail the emission test
• When parked in a closed space you may notice the smell of fuel.

Unusual Performance Indicators in Your Vehicle

Unlike problems with misfiring when there are several performance issues, with this error, you won’t notice much. The engine will work as usual, and the only thing that you may notice is fuel economy issues. Also worth mentioning is that the vehicle will not pass the emission tests.

Noteworthy Physical Signs of a P0455 Code Problem

The most obvious physical sign of a P0455 code is the smell of fuel vapors. If the leak is massive, you will notice this in an everyday drive. In other cases, the only way to notice this is when parking in a closed area.

Causes and Diagnosis of the P0455 Code

When experiencing an EVAP leak of any kind, the first thing to do is to check the EVAP and the fuel systems.

Typical Causes Behind a P0455 Code Alert

The only cause that can trigger a P0455 code is a complex EVAP leak. These EVAP vapor leaks can be caused by leaks in several parts of the system or by one big leak.

• Damaged or faulty gas cap seal
• Damaged or loose gas cap
• Blocked or damaged EVAP vent control valve
• Clogged or damaged EVAP purge volume control valve
• Loose, damaged, or disconnected EVAP hose
• Faulty charcoal canister
• Damaged fuel tank
• Faulty leak detection pump

See Also: P0441 Code: EVAP Incorrect Purge Flow (Causes & Fix)

Diagnostic Procedures for Identifying a P0455 Code

The diagnostic procedure is similar for all cars. To be sure, check the manufacturer’s manual. It is best to start with easy steps and then move to more difficult tests.

• Check the vehicle with the OBD-II scanner. If there are additional trouble codes, address them first.
• Visually inspect the fuel cap . In some cases, the damage is hard to notice. That is why we recommend changing the fuel cap. This is a cheap fix, and it may resolve your issue.
• Check the EVAP line and hoses going to the airbox for any damage. Sometimes, they can be disconnected or loose. If there is any visible damage, replace them immediately. If they are loose, use zip lines to secure them in place.
• Inspect the fuel tank for leaking. It may show signs of corrosion or external damage. If the fuel is leaking, replace the tank immediately. 
• Check the charcoal EVAP canister. If it is damaged, replace it.
• Examine the purge volume control valve. They can become sticky, which can also cause a leak. Test it and try to close it. If it is stuck open, replace it.
• Investigate the vent control valve. It may show the same symptoms as the purge volume control valve. It should be able to open and close regularly. If it fails, replace it.
• Do a fuel vapor leak test with a smoke leak detector machine. These machines can be bought for $100, but you can go to the auto repair shop for this step.

Practical Steps to Fix a P0455 Code Issue

The first and most important thing is to diagnose the problem. Check for any other error codes with the code reader so you know that the leak is the only issue. When you are certain about this, you can move forward. 

Proceed with the inspection of the EVAP system and look for anything unusual. First, look at the fuel cap. That is the most common reason for this error. Next, check the EVAP lines. There can be obvious damage that is the cause of the leak.

The more complex part of the diagnostic is checking the valves. If you are not a DIY mechanic, you can leave this to the mechanic. Also, it is important to check the fuel tank. It is an expensive part to replace, but if it is leaking, that can be dangerous.

After the inspection, clear the codes with the OBD-II scan tool and go for a test drive. Wait and see will the error and the check engine light come back. If it does, it may be the best solution to visit a mechanic.

Check Out How to Fix P0455 Engine Code in 3 Minutes :

Immediate Remedies for a P0455 Code Detection

Without knowing the underlying issue, you cannot fix the problem. Sometimes a new gas cap may fix this issue, but without the proper diagnosis, you cannot get rid of a P0455 code. 

Long-Term Solutions to Prevent P0455 Code Recurrence

The best way to prevent the P0455 is regular and proper maintenance. Talk with your mechanic and tell them to inspect all the parts of the EVAP system regularly. Replace the filters and fluids regularly. If you notice any fuel vapor smell, do not wait to do something. Do not get in a situation to find out about this error after failing the emission test.

FAQs About the P0455 Code

What would cause a large evap leak.

There are several causes for a large EVAP leak, and the most common are:

• Bad or loose gas cap
• Bad EVAP canister vent control valve
• Damaged EVAP line.

Can an EVAP Leakage Affect Gas Mileage?

Yes, an EVAP leakage can affect gas mileage. The vapors from the EVAP canister would be used in the combustion. If there is a leak in the EVAP system, additional fuel must be used to move the vehicle.

Can a P0455 Code Clear Itself?

No, a P0455 code cannot clear itself. The problem will remain until the underlying issues are resolved. It is best to resolve an EVAP problem because you will not be able to pass the emission tests. Also, your vehicle will send higher levels of bad emissions into the atmosphere.

Can I Still Drive with a P0455?

Yes, in most cases, you can still drive with a P0455 code. But, if you notice an intense fuel smell inside the car, go straight to the mechanic. Fuel vapors can be very dangerous if left unattended. In any case, do not wait too long to address this error code. Fix any EVAP vapor leaks as soon as possible.

How Much Is the Cost to Fix the P0455 Code?

The cost to fix the P0455 code depends on the problem that is causing it:

• Gas Cap Replacement: $20-$60
• Purge Volume Control Valve: $150-$200
• New EVAP Line: $50-$100
• Charcoal Canister: $200-$600
• Charcoal Canister Vent Control Valve: $150-$200
• Leak Detection Pump – $150-$450
• Fuel tank – $750-$1,500.

On these costs, you need to add the price of labor, which can vary between $75 and $150.

Need More Help with a P0455 Code?

Depending on the issue, the P0455 code can be easy and difficult to diagnose and fix. There are easy fixes like the fuel cap or the loose EVAP lines. But, there are other more advanced fixes, like a new fuel tank or other components of the EVAP system.

In most cases, you can drive with a P0455 code. But we advise you to fix it as soon as possible. Do not wait for the emission test to resolve this issue. You should not drive a vehicle that has problems with fuel vapors for too long. 

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P0455 OBD-II Evaporative Emission System Leak Detected (Large Leak) Trouble Code

Car Care Hacks

The P0455 OBD-II trouble code stands for Evaporative Emission System Leak Detected (large leak) which means that the Evaporative Emission Control (EVAP) system is leaking and can’t keep pressure. This code can happen for many reasons and is often associated with the P0440 trouble code.

In this article, I will be talking about the P0455 trouble code, its symptoms, causes, and how to fix it.

What Does The P0455 Code Mean?

Which models are affected by the p0455 code, what are the possible causes of the p0455 code, what are the common symptoms of the p0455 code, is it safe to drive with a p0455 code, how to diagnose the p0455 code, most common mistakes when diagnosing the p0455 code, how much does it cost to repair p0455 code, what repairs can fix the p0455 code, how to fix the p0455 code, in conclusion.

The P0455 trouble code means that the car’s software has found a large (gross) leak in the evaporative emissions system and made a note of it. Simply put, this DTC means that the vehicle’s EVAP system has been broken in some way, which lets fuel vapor escape into the air.

Modern cars have built-in evaporative emissions systems to catch the fuel vapor that naturally escapes. The vapors are then put in an EVAP canister and sent back into the engine through a purge valve and hoses.

These fuel vapors are then burned during combustion rather than released into the atmosphere.

The P0455 trouble code means that there is a leak in this system, which means that fuel vapors can’t be caught and stored as intended. This leak is detected by abnormal readings from an onboard pressure sensor, which are then interpreted by the vehicle’s ECM/PCM.

When these pressure readings differ, an active fault code is stored and the vehicle’s check engine light illuminates.

(See also: P0327 OBD-II Knock Sensor 1 Circuit Low Bank 1 or Single Sensor Trouble Code )

The P0455 code is caused when the vehicle’s computer detects a large leak in the emissions evaporative system.

Though the exact cause of The P0455 trouble code varies from case to case, almost every instance of this fault is caused by a leak in the evaporative emissions system.

Some of the most common causes of diagnostic trouble code P0455 are:

• The gas cap is missing, left open, or improperly secured.
• The gas cap is defective or damaged.
• The fuel tank filler neck is deformed.
• The fuel tank has a crack or is defective.
• The fuel tank pressure sensor is defective.
• The canister of charcoal EVAP is cracked or damaged.
• The EVAP hoses and clamps are disconnected, cracked, or punctured.
• The EVAP vent solenoid is defective or stuck open.
• The EVAP purge valve is defective and stuck open.

(See also: P0131 OBD-II O2 Sensor Circuit Low Voltage Bank 1 Sensor 1 Trouble Code )

Because trouble code P0455 is strictly emissions-related, your vehicle is unlikely to exhibit any additional symptoms other than the appearance of a check engine light. This is because, in a true operational sense, a vehicle’s evaporative emissions system has little to do with an engine function.

Here are the most common symptoms of the P0455 trouble code:

• The Check Engine Light is illuminated.
• A slight reduction in fuel economy.
• The odor of gasoline.

Yes, driving with a P0455 code is safe because it does not affect how the vehicle performs. However, driving with an emissions leak might lead to decreased fuel economy or even a rough idle.

In most cases, diagnostic trouble code P0455 is not a serious problem, but it should be investigated further. This fault is unlikely to cause any drivability issues and poses no risk of further vehicle damage.

(See also: P0107 OBD-II Manifold Absolute Pressure/Barometric Pressure Circuit Low Trouble Code )

To diagnose the P0455 trouble code, you should:

• Use an OBD-II scanner to diagnose this issue.
• Check the gas cap to ensure it is securely closed and there are no gaps or signs of leakage.
• Inspect the entire fuel system for any vacuum leaks.
• Check the hoses and connections for the evaporative emission control system for any cracks, kinks, or loose connections.
• Inspect the purge and vent solenoids for any signs of damage or contamination.
• Check the fuel tank pressure sensor for any signs of damage.
• Test the fuel tank pressure for any indications of a leak or faulty pressure regulator.
• Check the integrity of the charcoal canister for any signs of damage or contamination.

Diagnostic errors are mostly caused by failing to follow the procedure. The procedure is both logical and economically sound way to proceed. A fuel cap is usually less than $30, but other components, such as the Evaporative Emission System purge valve, can cost hundreds of dollars.

Diagnosing P0455 can cost up to $100.

Replacing the gas cap costs around $25.

Replacing the vent valve or purge solenoid costs $200 – $300.

Charcoal canister repair, if needed costs: $350 – $600.

Filler neck replacement costs between $300 – $440.

Repairs that can fix the P0455 trouble code include the following:

• Replace the gas cap, if it doesn’t tighten or seal.
• Replace the fuel filler neck if it is damaged or has anything that prevents it from sealing with the cap.
• Repairing any hose issues.

To fix the P0455 trouble code, you need to:

• Replace the gas cap, if it is necessary
• Inspect the EVAP system for any signs of tampering or damage.
• Check for any loose or disconnected hoses or connectors in the EVAP system.
• Inspect the EVAP canister for any signs of damage or clogging.
• Examine the EVAP system for any vacuum leaks.
• Inspect the purge valve for any signs of damage or clogging.
• Replace any faulty or worn-out components in the EVAP system.
• Clear the trouble code and retest the system.

The P0455 trouble code is a common code that indicates a problem with the evaporative emission control system. This system is responsible for controlling the release of fuel vapors from the vehicle, and when it is not functioning properly, it can cause the engine to run at lower efficiency and potentially cause damage to the catalytic converter.

This code should be addressed immediately to avoid further damage to the vehicle and to ensure proper engine performance. Diagnostic testing should be performed to determine the exact cause of the code and the necessary repairs should be done as soon as possible. Professional help should be sought if the problem is not resolved quickly and easily.

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P0455 and P0442 Codes? Find Large and Small EVAP Leaks

If your check engine light turns on for an EVAP code like P0455 (large leak) or P0442 (small leak), there is a small or large leak in the evaporative emission control system (EVAP) system. Learn how to find an EVAP leak in your car by checking these three common causes of P0455 and P0442 codes.

EVAP Code P0455 or P0442 Causing a Check Engine Light? How to Find an EVAP Leak

You might be driving and not notice any issues but then the check engine light comes on for code P0455 or P0442. If it reads for a large or small EVAP system leak , these are the most common causes.

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1. Gas Cap and/or Fuel Filler Neck – P0442

Check the gas cap.

A broken gas cap will usually cause a small leak in the EVAP system and trigger code P0442.

Make sure the gas cap secures tightly and isn’t loose. Remove the gas cap and check the seal. Make sure the seal isn’t cracked, breaking, or has missing pieces.

Read more on how to inspect the gas cap

Broken or Rusted Fuel Tank Filler Neck

Check the filler neck for rust build up. If you find minimal build-up, you can sand it off with sandpaper or emery cloth. If the fuel filler neck is too damaged to be fixed, replace it. We recommend replacing the gas cap at the same time as the fuel filler neck.

2. Faulty Purge Solenoid Valve – P0442 or P0455

The purge solenoid brings vacuum to the EVAP system. Vacuum enters through the intake manifold and an electrical connector controls the pure solenoid valve. If the purge valve leaks, it could trigger a P0455 or P0442 code, but it might also trigger a different EVAP code.

If the purge solenoid is defective, replace it. Steps include removing the hoses and disconnecting the electrical connector.

3. Faulty Vent Solenoid Valve – P0442 or P0455

When the purge valve opens, a vacuum line sends vacuum to the vapor canister. Charcoal in the canister eliminates fuel vapors from entering the atmosphere, and vacuum to the canister puts vacuum on the fuel tank by a line connected to it.

The canister has another line that connects to the vent solenoid valve . When the system is not operating, the vent valve will sit open. The gas tank, canister, lines, and vent valve need to be sealed. When the system is up and working, the valve closes and the purge valve up front opens. The EVAP canister vent solenoid valve will vent off excess vacuum, and it can trigger a large or small EVAP leak code if there’s a problem.

You might be able to tell if the vent solenoid valve is defective with an eye test. There might be a crack in the hose or a crack in the solenoid. If any pieces of this system are broken, replace them.

The valve can also clog or leak, and sometimes the problem is internal and can’t be seen. Debris and other contaminants can also make it difficult to close, and this will turn on a check engine light.

You can test the system with a smoke tester if a visual test does not show any problems.

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Chrysler 200 P0455: Meaning, Causes, + How to Fix

P0455 in the Chrysler 200 is a trouble code that indicates your truck has a LARGE evaporative emissions leak .

With this code, you shouldn’t notice any symptoms besides perhaps a noticeable fuel smell.

P0455 usually is not an immediate threat to the driveability of your 200. But, whenever the check engine light is on, it’s good to deal with the code as soon as possible.

Check that your 200’s gas cap is present and sealing well.

Table of Contents

• Is P0455 Serious ?

P0455 Definition: System Gross Leak – Evaporative Emission System

P0455 is a generic diagnostic trouble code, meaning it has the same definition for your Chrysler 200 as any other vehicle.  Repair steps will vary depending on the model year and engine.

Evaporative Emissions System

Your 200’s EVAP system (Evaporative Emission Control System) helps reduce emissions from your car by collecting fuel vapors from the gas tank and sending them back into the engine for combustion. 

The EVAP system prevents harmful gases from escaping into the atmosphere and does not affect how the engine runs, which means this code is not a breakdown risk.

System Gross Leak

When there is a large leak in the Chrysler 200’s EVAP system, it will throw the P0455 OBDII Code.

P0455 indicates a large leak in the evaporative emission control system. (EVAP). There are different leak size codes. For example,  P0456  means your 200 has a small EVAP leak.

While the trouble code may state that there is a “large leak” in the EVAP system of your Chrysler 200, the actual leak will most likely still look relatively small. The “large” really refers to how much pressure is lost.

Chrysler 200 P0455 OBDII Code Symptoms

P0455 code will typically not be accompanied by any noticeable symptoms other than the smell of gas and the service engine soon light. You should particularly notice the smell of fuel around the fuel tank area or fuel filler tube.

The EVAP system deals directly with fuel vapors. If these vapors leak from the system, you’ll often smell them faintly while operating the vehicle.

200 P0455 Trouble Code Causes

Here are the most common causes of P0455. How your 200’s EVAP system works will depend on the model year and engine type .

• Evap System Hose – The EVAP hose carries fuel vapor from the fuel tank to the intake manifold can begin to leak. This will cause the P0455 code. Look for either a tear or in the hose. This is one of the most common issues that causes the code.
• Purge Valve – One of the most common causes of the P0455 code is the vapor canister purge valve. An EVAP purge valve is a component of the EVAP system that allows fuel vapors to be released from the charcoal canister and sent back into the engine for combustion.
• Faulty Charcoal Canister – An EVAP (Evaporative Emission Control System) charcoal canister plays a vital role in operating a car’s emissions system. The EVAP canister is filled with activated carbon, which helps reduce pollutants by trapping fuel vapors emitted from the gas tank and storing them until they can be burned off in the engine.
• Fuel Tank Sending Unit – It is possible for the gasket that attaches the fuel sending unit to the gas tank to go bad. This can reduce tank pressure and throw the code.
• Fuel Cap – A bad fuel cap can cause P0455. Often, you’ll get a message informing you that the fuel cap is off even when it is on. If you are getting that message, plus a P0455, it may save you a ton of time and money to replace the fuel cap and see if it goes away.
• Fuel Filler Neck – There is often a gasket where the fuel filler neck connects with the gas tank. This gasket can dry out, especially with vehicles that spend their time in dry climates. When the fuel filler neck gasket dries out, the fuel tank can’t hold pressure anymore.

P0455 Diagnosis

Diagnosis at Home

Before sending your 200 off for a thorough evaluation, you can do a few things.

• Inspect the EVAP system hoses for a leak.
• Check the seal on your 200’s gas cap. This video is a fantastic resource on  how to test your gas cap .
• Use your nose. Walk around your car. Smell around the gas cap, fuel filler neck, EVAP hoses, and anywhere else you can safely get your head. You’re looking for the smell of fuel.

How a Mechanic Diagnoses P0455

A mechanic has a wide range of instruments to aid in diagnosing the p0455 code in your Chrysler 200.

• The mechanic will typically check to see if there are any other trouble codes. Additional trouble codes provide clues to the problem.
• After ascertaining what trouble codes appear with the P0455, the mechanic will typically inspect the EVAP system. This includes the purge valve, line, and canister.
• The mechanic will inspect the gas cap to ensure it can handle 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 fuel tank pressure will be checked and monitored.
• After the checks and fixes listed above, the mechanic will perform two tests: (1) A smoke test (using a smoke machine). (2) They’ll use a scan tool to confirm that the EVAP vent solenoids and valves are operating correctly.

Here’s a pretty good video on diagnosing these leaks from Scotty Kilmer, if you are interested:

Most Common P0455 Fixes

Here are the most common 200 P0455 fixes:

• Gas cap replacement
• EVAP line replacement
• Replace charcoal canister
• Replace the fuel tank
• Replacing a vent control valve/purge valve

P0455 in the Chrysler 200 can often be found with your nose

Is P0455 a Serious Concern?

While P0455 will not cause your 200’s engine to stop running, it should not be treated lightly. You could have a fuel leak. Pay extra attention to your tank level and make sure you are not leaking fuel. We recommend taking it in and dealing with it right away.

Chrysler DTC P0455

• EVAP SYSTEM COMPONENTS OR PLUMBING LEAK
• ESIM INTERNAL CHECK VALVES LEAKING
• 18-020-16 REV. A
• S2125000002