Chevy Trax P0455 Code Diagnosis

The most frequent trouble code with the Chevy Trax The Code P0455. This code is a trouble number. It's the one you get when you connect your Trax to an OBDII scanner. If there's a problem, P0455 means that it is. Large leak It is part of the evaporative emission controller system. This code is often found with or related to P0420,P0441 and, very frequently, P0440.

The P0455 issue is not usually a threat 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. It may also be accompanied with P0442. For more information, see Chevy Trax OBDII code P0442.

Chevy Trax P0455 Definition

P0455 refers to a general OBDII trouble code. The code can be used regardless of the make and model of the vehicle. Technically, the code stands for:

System Gross Leak – Evaporative Emission System

The EVAP system collects fuel vapor from your fuel tank, and then sends it to the intake to ignite the engine in normal combustion. When there is a large leak in the Chevy Trax’s EVAP system, it will throw the P0455 OBDII Code.

Chevy Trax P0455 OBDII Code Symptoms

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

The fuel tank and fuel filler tubes should smell particularly strong.

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

Trax P0455 Troublecode Causes

You can trigger the P0455 code in Chevy Trax by a variety of things. The most frequent problems that cause the code to appear are:

• Evap 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 main problem that can cause the 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.
• The Faulty Charcoal Caister– 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 Chevy Trax Diagnostics

The mechanic will have a lot of different tools at his disposal in order to determine the cause of your Chevy Trax P0455. The most commonly used methods to diagnose this code are:

• A 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 Check out the EVAP System. These include the line and purge valve.
• 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.
• Monitoring and checking the fuel tank pressure is a must.
• 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 Chevy Trax, the actual leak will most likely still look rather small. The “large” really is referring to how much pressure is being lost.

Most common P0455 fixes

Below are the most commonly used Trax P0455 Fixes:

• Replacing the gas cap
• Replacement for EVAP lines
• Replace charcoal canister
• Replacing 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 find the cause of your Chevy Trax throwing the P0455 code. This should help. Please feel free to add anything below.

Are P0455 Serious Concerns?

While P0455 is not going to cause the Trax’s engine to stop running, it should not be treated lightly. Fuel leaks could be a problem. You should pay extra attention to the level of your fuel tank and ensure that you're not leaking fuel. You should immediately take it in for repair or replacement.