Ford Edge P0455: EVAP System → Leak Detected (Large)

The most frequent trouble code with the Ford Edge Is the P0455 Code. The trouble code refers to a number you receive when your Edge is plugged into an OBD2 scanner. It has to do the emission system. The P0455 code indicates that the emissions system is malfunctioning. Large leak In the evaporative emissions control system (EVAP). It is frequently found alongside, or closely related to, other codes like P0420/P0430, P0441 and, very often, P0440.

P0455: EVAP System → Leak Detected (Large)

The P0455 issue is not usually a threat to your Edge's driveability. Certainly anytime the service engine soon light is on, it’s good to deal with it as soon as possible though.

Ford Edge Definition P0455

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

System Gross Leak Evaporative Emission System

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

Ford Edge OBDII Code Symptoms

The P0455 code is usually not accompanied with any other symptoms than those listed. The smell of gas The service engine soon light. It is possible to notice a slight dip in fuel economy.

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

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.

Edge P0455 Trouble code Causes

P0455 Trouble code can be triggered in Ford Edge by many factors. The most frequent problems that trigger this code are:

• Evap Hose– The hose that carries the fuel vapor from the fuel tank to the intake manifold can begin to leak. This can lead to the P0455 code. You should look for a hole or a tear in the code. 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. You will need to locate and take out a few clips.
• 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. You may not get the message but a P0455. This will save you time and 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.

Ford Edge Diagnostics - P0455

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

• A mechanic will often check to make sure there are no other codes. It is easier to diagnose problems if there are more codes. 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. 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 Ford Edge, the actual leak will most likely still look rather small. The “large” really is referring to how much pressure is being lost.

The Most Popular P0455 Fixes

Below are the top Edge P0455 solutions:

• Replacing the gas cap
• Replacing EVAP lines
• 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 test your gas tank.

We wish you all the best in finding out why your Ford Edge is throwing the code P0455. This should help. Please feel free to add anything below.

Are P0455 Serious Concerns?

While P0455 is not going to cause the Edge’s engine to stop running, it should not be treated lightly. Fuel leaks could be a problem. Check your fuel level to make sure it is not leaked. It is best to have it checked and/or dealt with immediately.