The P0455 code - Definition, Causes, and Symptoms (& How to Fix It)

The trouble code P0455 appears when your engine control unit detects a leakage in the EVAP emission system.

This could have many reasons. The P0455 Code is explained in detail.

Índice de Contenido
  1. Definition of P0455
  2. What is the meaning of P0455?
  3. P0455 Symptoms
  4. Is the P0455 Code serious?
  5. What is the P0455 code?
  6. Which repairs are possible to fix the code P0455
  7. Common diagnostic errors with P0455
  8. Diagnostic Tools
  9. How do I diagnose the P0455 Code?
    1. Similar Posts
  10. Calculated Cost for Repair
  11. Common P0455 Questions
    1. What is the best way to solve P0455?
    2. How do I get the code P0455?
    3. What is P0455?
    4. How do I clear the code P0455

Definition of P0455

EVAP System Leak Detected (Large Leak)

What is the meaning of P0455?

An P0455 Code indicates that the EVAP emission control system is leaking.

The EVAP emission is a closed fuel gas system. It is used to run your engine in order to meet environmental requirements. The engine control unit will store any detected leaks as a P0455 number.

Although this trouble code looks very similar to P0442, it tells us that there was a major leak and not a minor one.

P0455 Symptoms

Most likely, you will not feel any symptoms other than the check engine lamp.

Is the P0455 Code serious?

Very low – There is no danger for your engine to keep driving with the P0455 code.

A rare situation could cause your engine to run slightly slower than normal due to a leak. This is not only harmful to the environment.

What is the P0455 code?

A P0455 error is most commonly caused by letting your engine start at the station without the fuel cap. You may also have a leaky fuel cap, or an inoperable hose.

  • Vent control and bleed valves that are defective.
  • Cap gasket damaged
  • The charcoal canister is leaking.
  • Leaking EVAP hoses
  • There are leaks in the main fuel tank.

Which repairs are possible to fix the code P0455

  • Tightening the gas cap & remove the trouble code.
  • Gas cap to be replaced
  • Replacing the EVAP control valve
  • Replace EVAP hoses
  • Replacing charcoal canister
  • Replace Fuel tank

Common diagnostic errors with P0455

Deep diagnostics are the most frequent mistake that causes P0455 trouble codes. Usually, this trouble code appears when you didn’t shut off your car while refueling it at the gas station or a faulty gas cap. Before diagnosing your vehicle, these are the two most basic things to check.

Diagnostic Tools

How do I diagnose the P0455 Code?

  1. Make sure to connect your OBD2 scanner, and look for any related trouble codes. After you have refueled, ensure that your trouble code isn't accidentally saved.
  2. You must ensure that your gas cap is securely closed and all seals are intact.
  3. The EVAP solenoid should be checked. You can test the function of your EVAP solenoid by sending it power. Make sure it is sealed when it’s closed. Check the wirings to it and make sure the engine control unit sends + and – to it.
  4. Turn off the fuel vent and push it toward the tank. You should seal it. If you find a leak you can use an EVAP smoking machine to easily put smoke in the tank.
  5. Once everything has been sealed, the solenoid is functional you will be able to remove trouble codes and then test your car.

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Calculated Cost for Repair

Below are some examples for repair costs associated with the P0455 Code. Prices include labor and parts. This price does not include any diagnostic fees.

  • Gas Cap Replacement Cost – 30$ – 80$
  • Vacuum Hose Replacement – 5$ – 50$
  • Replace EVAP control valve – 40$ – 60$

Common P0455 Questions

What is the best way to solve P0455?

Most often, the only thing you need to do in order to fix P0455 is tighten the gas gap or replace it. You can reset the P0455 codes by tightening or replacing the gas gap if the code appears after you have run the engine with the cap off.

How do I get the code P0455?

A gas cap that is not properly tightened or defective can often cause the P0455 code. This code can also be caused by a gas cap that is not tightened or faulty.

What is P0455?

The P0455 means that the engine control unit recognized a leak in the EVAP system, which controls the gas tank’s fuel vapors.

How do I clear the code P0455

An OBD2 scanner is required to clear P0455 codes. Connect the scanner and clear any codes. Then, take the vehicle for a drive.

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