the P0455 Code

Decoding the P0455 Code in Your Nissan: Causes and Solutions

Prashant Salla
Prashant Salla5 min read
Decoding the P0455 Code in Your Nissan: Causes and Solutions

Have you ever seen the dreaded "Check Engine" light pop up on your Nissan's dashboard, only to discover that the culprit is the P0455 code? 

While this code may seem cryptic and intimidating at first, fear not - understanding its causes and solutions can be a straightforward process. 

In this article, we'll decode the P0455 code in your Nissan and explore some of the common reasons why it may appear. 

Additionally, we'll provide some solutions to help you tackle this pesky problem and get your Nissan vehicle back on the road. 

Fixing the P0455 Code with Goodhood

When driving your car on the road, it can be difficult to pinpoint the source of your P0455 code.

Fortunately, Goodhood can help you with that!

Goodhood is a mobile auto repair service that sends expert technicians to your location so you don't have to leave your home. All our mechanics are certified and highly experienced in resolving P0455 codes on Nissans.

We fix essential engine codes and other vehicle issues like spark plug replacements, oil changes, etc. 

With Goodhood, you don't need to worry about getting your car towed or stranded in a repair shop for days - our technicians will come right to your location and get the job done quickly and efficiently. 

Common Causes of the P0455 Code

Loose or Damaged Gas Cap

Something as simple as a damaged and/or loose gas or fuel cap can trigger the P0455 code. The gas cap serves as a seal to keep fuel vapors from escaping into the outside atmosphere, and if it's not tightened correctly or has a damaged gasket, it can cause an EVAP leak and trigger the code. The fuel filler cap should also be inspected and replaced if necessary.

Faulty EVAP System Components

The evaporative emission control system captures and stores fuel vapors in a charcoal canister and then purges them into the engine when conditions are right. If any of the components within this system, such as the canister, purge control valve, vent control valve, or pressure sensor, are faulty, it can cause a leak and trigger the P0455 code.

Leaking Fuel Tank or Fuel Filler Neck

A leak in the car's fuel tank or fuel filler neck can cause fuel vapors to escape and trigger the P0455 code. These leaks can be caused by a number of factors, such as rust or damage to the tank or a loose or damaged filler neck.

Cracked or Damaged EVAP Lines or Hoses

The EVAP lines and hoses are responsible for carrying fuel vapors between the various components of the system. If any of these lines or hoses become cracked or damaged, it can cause a leak and trigger the P0455 code.

Failed EVAP Canister or Purge Valve

If the EVAP canister or purge valve fails, it can cause a leak in the system and trigger the P0455 code. The canister is responsible for storing fuel vapors, while the purge valve is responsible for controlling when those vapors are released into the engine. 

If either of these components malfunctions or fails, it can cause an EVAP leak and trigger the code.

If you're experiencing the P0455 code in your Nissan, it's important to diagnose and address the underlying issue as soon as possible. By understanding these common causes and how they can trigger the code, you'll be better equipped to identify and address the problem effectively.

How a Professional Mechanic Inspects and Diagnoses the P0455 Code

When it comes to diagnosing the P0455 code in your Nissan, a professional mechanic will typically follow a set process to identify the underlying issue. Here's an overview of how a mechanic may inspect and diagnose the code:

Perform a Visual Inspection

The first step is performing a visual inspection of the EVAP system components, including the canister, hoses, lines, and purge valve. They will look for signs of damage or wear, as well as any loose connections or missing components.

Check the Gas Cap

The professional mechanic will check the gas cap to ensure that it's properly tightened and that the gasket is in good condition. They may also use a special tool to check the pressure of the fuel tank to ensure that it's holding pressure correctly.

Conduct a Smoke Test

A smoke test involves introducing smoke into the EVAP system to identify any leaks. The mechanic will block off the system and then introduce smoke through a special tool. If there's a leak, the smoke will escape and reveal the location of the leak.

Check the EVAP System Pressure

The mechanic may use a pressure gauge to check the pressure within the EVAP system. If the pressure is too low, it could indicate a leak or a faulty component within the system.

Use a Scan Tool

A mechanic will typically use a scan tool to read the P0455 code and any other codes that may be present. They can also use the tool to monitor sensor data and other parameters to help identify the underlying issue.

Once the mechanic has identified the underlying cause of the P0455 code, they can then take steps to address the issue. This may involve replacing a faulty component, repairing a leak, or simply tightening the gas cap. By following this process, a professional mechanic can quickly and accurately diagnose the issue and get your Nissan back on the road in no time.


The P0455 code can be a hassle to diagnose and repair, but understanding its causes and how to inspect for them can go a long way in getting your Nissan back on the road quickly.

If you're having trouble diagnosing or repairing this code, don't hesitate to call Goodhood - our experienced technicians are here to help!

We can diagnose the issue and repair any faulty components quickly and efficiently, so you can enjoy your car in no time. Reach out today to get started!

Frequently Asked Questions

What does the P0455 code mean?

The P0455 code indicates that there's a large leak in the EVAP system. This could be caused by a damaged or loose gas cap, faulty system components, a leaking fuel tank or fuel filler neck, cracked or damaged EVAP lines or hoses, or a failed EVAP canister or purge valve.

How do I fix the P0455 code?

To fix the P0455 code, you'll need to identify and address the underlying issue. A professional mechanic can diagnose the problem and replace any faulty components quickly and efficiently. 

At Goodhood, our experienced technicians are here to help - we offer mobile auto repair services to quickly and accurately identify the source of your P0455 code.

Can I drive my car with the P0455 code?

Driving your car with the P0455 code is not recommended, as it can lead to further damage or even a breakdown. It's best to have a professional mechanic inspect and diagnose the issue as soon as possible. 

At Goodhood, we can send a technician out to your location to help you identify and address the underlying issue quickly. Reach out today for assistance!