Nissan Frontier P0455 Code Diagnosis

This is one of the most commonly encountered trouble codes for the Nissan Frontier Is the Code P0455. The trouble code refers to a number you receive when your Frontier is plugged into an OBDII scanner. The trouble code P0455 indicates that there are a Leakage large It is part of the evaporative emission controller system. It is frequently found in conjunction with other codes such as P0420 or P0441.

Normally, P0455 does not pose a threat to your Frontier's driveability. Certainly anytime the service engine soon light is on, it’s good to deal with it as soon as possible though. It may also be accompanied with P0442. For more information, see the Nissan Frontier OBDII code P0442.

Nissan Frontier P0455 Definition

P0455 refers to a general OBDII trouble code. It means that no matter what make or model vehicle you have, this code will still mean the same thing. Technically, the code stands for:

System Gross Leak – Evaporative Emission System

The EVAP captures any fuel vapor in the tank, and transmits it to engines intake for ignition. When there is a large leak in the Nissan Frontier’s EVAP system, it will throw the P0455 OBDII Code.

Nissan Frontier P0455 OBDII Code Symptoms

A P0455 Code will usually not cause any symptoms except the ones listed below. Smells like gas And the service engine soon light. The slightest drop in fuel economy may also be noticeable.

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.

Frontier P0455 Trouble Code Causes

The P0455 code can be triggered by many factors in the Nissan Frontier. The most frequent problems that trigger this code are:

• Evap System Hose– The hose that carries the fuel vapor from the fuel tank to the intake manifold can begin to leak. The P0455 error code will be generated. It should be checked for tears or holes. This is the leading cause of code.
• Vapor Canister Purge Valve– One of the most common causes of the P0455 code is the vapor canister purge valve. It’s really easy to replace. There are some clips you will need to look for and then remove.
• A Faulty Canister of Charcoal– The charcoal canister is often the cause of P0455.
• Fuel Tank Sending Unit– It is possible for the gasket that attaches the fuel sending unit to the gas tank to go bad. It can lower the tank pressure, which could throw out the code.
• 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 P0455 to ensure you don't waste any money.
• 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.

P0455 Diagnosis- Nissan Frontier

The mechanic will have a lot of different tools at his disposal in order to determine the cause of your Nissan Frontier P0455. These are some of the common diagnostics that can be done for the code.

• The mechanic will usually check for any additional trouble 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 P0455, he or she will usually Take a look at the EVAP system. It includes the purge valve and line as well as the canister.
• 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.
• Monitor and check the pressure in your fuel tank.
• The mechanic will then perform the following tests after completing the above-mentioned checks:
• A smoke test, and they’ll use a scan tool to confirm that the EVAP solenoids and valves are operating properly.

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

While the trouble code may state that there is a “large leak” in the EVAP system of your Nissan Frontier, the actual leak will most likely still look rather small. The “large” really is referring to how much pressure is being lost.

Commonly Used P0455 Fixes

These are some of the most popular Frontier P0455 fix:

• Replacement of gas cap
• Replacement for EVAP Line
• Replace charcoal canister
• Change the fuel tank

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 quickly. We trust this helped. Please feel free to add anything below.

Do you consider P0455 to be a serious concern?

While P0455 is not going to cause the Frontier’s engine to stop running, it should not be treated lightly. Fuel leaks could be a problem. Check your tank regularly to make sure there is no fuel leaking. It is best to have it checked and/or dealt with immediately.