Hyundai Elantra P0455 Code Diagnosis
The most frequent trouble code with the Hyundai Elantra Is the Code P0455. This code is used to refer to the number given when your Elantra's OBDII scanner is connected. The code P0455 indicates that the vehicle is experiencing trouble. Leakage large It is part of the evaporative emission controller system. This code often appears alongside, or is closely related to, other codes such as P0420 and P0441.
Your Elantra’s driveability is generally not affected by P0455. Certainly anytime the service engine soon light is on, it’s good to deal with it as soon as possible though. It's often associated with P0442. For more information, see Hyundai Elantra OBDII code P0442.
Hyundai Elantra P0455 Definition
The universal OBDII code P0455 can be used to diagnose trouble codes. 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 fuel tanks and then sends it to the intake of the engine to ignite the combustion process. When there is a large leak in the Hyundai Elantra’s EVAP system, it will throw the P0455 OBDII Code.
Hyundai Elantra 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. It is possible to notice a slight dip in fuel economy.
Particular attention should be paid to the smell of fuel near the fuel tank or fuel filler tube.
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.
Elantra P0455 Trouble code Causes
Many things can trigger the P0455 code in Hyundai Elantra. 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. 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. 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.
Hyundai Elantra Diagnosis - P0455
The mechanic will have a lot of different tools at his disposal in order to determine the cause of your Hyundai Elantra 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 Check out the EVAP System. These include the line and purge valve.
- A mechanic will examine the gas cap and verify that it is able to withstand high 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.
- Monitoring and checking the fuel tank pressure is a must.
- Following the inspections and repairs, the mechanic will conduct two more tests.
- 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 Hyundai Elantra, 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
These are some of the most popular Elantra P0455 fix:
- Replacing the 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.
It's a good idea to try and figure out why your Hyundai Elantra is throwing the code P0455. We trust this helped. You can add any additional information by leaving a comment.
Are P0455 Serious Concerns?
While P0455 is not going to cause the Elantra’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. It is best to have it checked and/or dealt with immediately.
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