Diagnostic Code for Kia Optima: P0455

This is one of the most commonly encountered trouble codes for the Kia Optima The Code P0455. This code is a trouble number. It's the one you get when your Optima goes into an OBDII scanner. If there's a problem, P0455 means that it is. Large leak In the evaporative emissions control system. This code is often found with or related to P0420,P0441 and, very frequently, P0440.

 

Kia Optima P0455

 

The P0455 issue is not usually a threat to your Optima'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. More information is available at Kia Optima OBDII Code P0442

 

Índice de Contenido
  1. Kia Optima P0455 Description
  2. Kia Optima OBDII code Symptoms
  3. Optima Trouble Code P0455
  4. P0455 Diagnoses- Kia Optima
  5. Most common P0455 fixes
  6. Do you consider P0455 to be a serious concern?

Kia Optima P0455 Description

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 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 Kia Optima’s EVAP system, it will throw the P0455 OBDII Code.

 

Kia Optima OBDII code Symptoms

P0455 OBDII Code Diagnosis Kia Optima
The P0455 code is usually triggered by the service engine soon lamp.

The P0455 code is usually not accompanied with any other symptoms than those listed. Smells like gas The service engine soon light. The slightest drop in fuel economy may also be noticeable.

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.

 

Optima Trouble Code P0455

You can have the Kia Optima's P0455 trouble code trigger. 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. This can lead to the P0455 code. 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 Diagnoses- Kia Optima

P0455 Kia Optima

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

  • The mechanic will check for 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 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.
  • 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 Kia Optima, 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

P0455 Fix Kia Optima

These are some of the most popular Optima P0455 fix:

  • Replacement of gas cap
  • Replacement for EVAP Line
  • 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 test your gas tank.

You will need to find the cause of your Kia Optima throwing the code P0455. This should help. You can add any additional information by leaving a comment.

 

Do you consider P0455 to be a serious concern?

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

¡Más Contenido!

Leave a Reply

Your email address will not be published. Required fields are marked *

Go up