How To Fix P0455 Obd2 Code?

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How To Fix P0455 Cbd2 Code?
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The EVAP system prevents the fumes to disperse in the air. That is to say before fuel vapors are emitted into the atmosphere, the Evaporative Emission System (EVAP) is meant to store and dispose of them. This not only helps the environment but also increases fuel efficiency and removes the stink of gasoline in your cabin.

OBD2 Code P0455; What is it and what does it indicate?

OBD2 Code P0455; What is it and what does it indicate?

When the PCM identifies a major leak issue in the EVAP system, the error code P0455 flashes. The primary aim of the EVAP system is to prevent gasoline vapor from exiting the fuel tank and entering the atmosphere. The hoses transport fuel vapors to the charcoal canisters for storage. A purge valve opens as the engine begins, enabling the vacuum to drain off the fuel vapors into the engine.

Error Code P0455: Symptoms, Causes & Fix

OBD2 P0455 Code Error; Causes 

The vehicle’s PCM system detects the code that depicts the generic problem. However, the root cause needs to be found. Here are some factors that can cause the PCM to trigger the P0455 OBD2 code error.

  • A gas cap that is loose or poorly positioned
  • The improper gas cap was used (not factory or original brand)
  • EVAP system hose leak or damage
  • Leak in the fuel tank or the EVAP canister
  • A foreign item has been lodged in the gasoline filler cap.
  • Fuel tank with a faulty gasket that does not properly seal
  • Canister of carbon that has been damaged or divided

OBD2 Error Code P0455; Symptoms

If your vehicle is showing any of these symptoms, there are potential chances of OBD2 Error Code P0455.

  • The Check Engine Light is illuminated.
  • Fuel efficiency has dropped.
  • Fuel odor is caused by the discharge of fuel vapor.

OBD2 P0455 Code Error; Diagnosis

The right diagnosis of the main issue can save you from unnecessary fixes or replacements. Thus, saving your time and money. Here are some steps you can perform on your own to diagnose po455 code errors. 

  • To ensure a sealed fuel tank, remove the gas cap and reattach it snugly.
  • Clear the OBD2 error codes from the scanning tool
  • Drive your vehicle for a day to see whether the code reappears. 
  • If the issue still prevails, you should inspect the old gas cap and replace it with a new one if it doesn’t feel snug and secure.
  • Examine the EVAP system for damage, such as cuts or holes in the tubes and hoses. 
  • Also, make sure the EVAP canister purge volume control solenoid valve is working properly. You can locate the purge volume control solenoid by following the vacuum line from your intake manifold. ​
  • After that, disconnect the 2-pin waterproof connection and check for power and signal. It’s as simple as disconnecting the connection and inspecting the hoses for leaks. 
  • To discover leaks, fill a container with soapy water and gently spray it on the hoses.
  • Then follow the vacuum line down to the EVAP resonator. It’s the green-capped plastic 1-way valve that connects to the EVAP service port. 
  • Remove the adapter for the EVAP service port and perform a pressure test before checking for leaks. 
  • Replace the vacuum line after you’ve located the leak. 

This generally resolves the problem code P0455 And Obd2 code P0309

Mistakes to Avoid When Diagnosing The P0455 Code

The wrong diagnosis can lead you to cost more than expected and still keep the issue reappearing. You do not want that? Here are mistakes you should avoid while diagnosing the code error. 

  • Do not skip or hasten the diagnostic process. 
  • Make sure to follow all the steps in the right order. 

Fix P0455 Obd2 Code: Evaporative Emission Control System Gross Leak 

Fix P0455 Evaporative Emission Control System Gross Leak 

It is not that critical to resolve the error code P0455. Here are some fixes for dealing with this problem:

  • Gas cap replacement
  • The gasoline filler neck was replaced.
  • Any hose issues should be repaired or replaced.

Vehicles that usually face P0455 issues?

  • P0455 Acura 
  • P0455 Honda 
  • P0455 Mitsubishi 
  • P0455 Audi 
  • P0455 Hyundai 
  • P0455 Nissan 
  • P0455 BMW 
  • P0455 Infiniti 
  • P0455 Porsche 
  • P0455 Buick 
  • P0455 Jaguar 
  • P0455 Saab 
  • P0455 Cadillac 
  • P0455 Jeep 


Is it safe to drive if you have an EVAP leak?

Is Driving with an EVAP Leak Safe? A check engine light is usually ignored by most drivers, at least until their next service appointment. It’s not a good idea to keep driving with the check engine light on since an EVAP leak may be a serious and ecologically hazardous issue.

Does P0455 go away on its own?

After the gas cap is correctly closed, it may take several drive cycles for the light to reset itself. This is because when the automobile is driven at a constant pace for some time, the vehicle’s emission system performs self-tests. It is better to get your automobile examined if the Check Engine light remains on after a few days of driving.

What is the cost of repairing P0455?

A lost gas cap might set you back $25. However, depending on the labor and components, replacing a vent or purge valve might cost between $200 and $300. A charcoal canister repair will cost between $400 and $600, depending on the location. A filler neck replacement might cost between $300 and $400. Usually, the components cost more than the labor. 

Is it true that an EVAP leak reduces gas mileage?

When a canister purge valve fails to open properly, your gas mileage may suffer as a result. The combustion vapors in your automobile will proceed to the EVAP canister, where they will be released into the environment, leading you to utilize part of the gasoline that your car would normally burn.

Does the EVAP system have an impact on performance?

Your engine may not be able to function properly if there is a leak in the EVAP system. You may have problems not just with idle but also with acceleration. The gas-air mixture gets imbalanced when there isn’t enough fuel in the system.