Error Code P0455: What It Means & What To Do?

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Error code P0455 is an OBD code that usually set when the gas cap is loose or missing from the fuel tank. This triggers the powertrain control module as fuel fumes leaks from the tank into the atmosphere. Unburned droplets or raw fuel can contribute to smog and can

affect breathing.

 

Error code P0455 means a large leak has been detected in the fuel vapour or lack of purge flow in the vehicle’s EVAP (Evaporative Emission System) control system.

Error code P0455 flashes when the PCM detects a large leak problem in the EVAP system. Normally, the EVAP system is sealed tight, as its main purpose is to keep gasoline vapour from escaping the fuel tank to the atmosphere. Fuel vapours are sent to the charcoal canisters through the hoses for storage. When the engine starts a purge control, a purge valve will open, allowing the vacuum to drain off the fuel vapours to the engine.

 

What causes this problem with the Evaporative Emission Control System Leak?

 

• Loose or improperly placed gas cap
• Use of incorrect gas cap (not factory or original brand)
• Leak or damage in EVAP system hose
• Fuel tank or EVAP canister leak
• Foreign object caught in the fuel filler cap
• Defective fuel tank that doesn’t fully seal gasket
• Damaged or split carbon canister

1. Fuel Tank Filler Neck - If the fuel tank filler neck is faulty, it must be replaced immediately. Buy new filler neck now!
2. Fuel Tank Vent Valve - Check for faults in the vent valve and replace it immediately if required.
3. Vapour Canister Valve - Sometimes, the canister valve can be faulty allowing vapour to enter the system. Replace them immediately.
4. Fuel Tank - Sometimes, the fuel tank can itself be damaged and can cause leakages. Buy new fuel tank and replace it now!
5. Fuel Tank Cap - If the tank cap is damaged or broken, it will lead to leakages. Buy new fuel tank cap now!
6. Diagnostic Tools - A qualified mechanic will need quality diagnostic tools to resolve this OBD error. Buy new tools from us at exciting prices.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P0455 code by mentioning some major symptoms below:

 

Common Symptoms

 

• Check Engine Light is on
• Decreased fuel economy
• Fuel smell due to release of fuel vapour

It is very important to fix the fault code P0455. So here are some ways with which you can correct this issue:

 

• Replacement of gas cap
• Replacement of the fuel filler neck
• Repair/replace any hose problems

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of Fuel Tank Filler Neck, Evaporative Vent Valve, EVAP Purge Switch, Carbon Canister, Fuel Tank, Fuel Cap and many more. Now all your problems would vanish within no time.

Here are some steps which you should follow in order to diagnose this fault code:

 

Remove the gas cap and replace it nice and tight to secure a sealed fuel tank. Clear the codes from your code reader tool, drive your car for a day and then check if the code comes back. If gas cap doesn’t feel tight and secure, then it’s a good time to retire it and get a new one.

 

Inspect the EVAP system for signs of damage such as cuts or holes along the tubes and hoses. You may notice a fuel smell or vacuum noise. Repair the problem as soon as possible. Also, check the EVAP canister purge volume control solenoid valve. Follow the vacuum line from your intake manifold to locate the EVAP canister purge volume control solenoid.

 

Then, unplug the 2-pin weatherproof connector and test it for proper power and signal. You can do it by unplugging the connector and check the hoses for leaking. Fill a bottle with soapy water and gently spray it on the hoses to detect signs of leaks.

 

Then, move down the vacuum line until you see the EVAP resonator. It’s the plastic 1-way valve that leads to EVAP service port, usually covered by a green cap. Take off the adaptor for EVAP service port and pressure tested and start looking for leaks. Once you have found the leak, replace the vacuum line. This will usually fix the error code P0455.

 

Common Mistakes When Diagnosing the P0455 Code

 

• Missing/damaged fuel cap
• Distorted or damaged Fuel Tank Filler Neck
• Torn or punctured Evaporative system hose(s)
• Defective Fuel Tank Sending Unit gasket or seal
• Split or damaged Carbon Canister
• Defective Evaporative Vent Valve and/or Evaporative Purge Valve
• Defective or damaged fuel tank
• Defective Fuel Tank Pressure Sensor