P0455 EVAP System Large Leak Detected
Any large leak in your evaporative emission control system, or EVAP system, can signal trouble code P0455. You may be wondering, how do I fix trouble code P0455? Learn more about this helpful emissions system and how you can restore your vehicle and remove this trouble code.
What Is an EVAP System?
Your vehicle’s EVAP system helps reduce your emissions and prevent harmful fuel vapor leaks into the environment. While your vehicle is at rest, vapors are being released from your fuel tank. Without a proper seal, these vapors could easily escape.
Instead, your EVAP system creates a sealed system that channels your fuel vapors through a series of hoses into a charcoal filter canister. Once you start your engine, a purge valve opens and an intake vacuum siphons the vapors into your engine to be burned. So, what does the code P0455 mean? A sensor has noted a large leak somewhere in the system so that a vacuum cannot be created.
While an EVAP system isn’t required to start an engine, it’s an essential protective system. This system protects the environment from harmful emissions, so it’s important to get it repaired as soon as possible. A large leak diagnostic trouble code is related to, and could also cause, these additional trouble codes:
- And more
Many of these EVAP trouble codes are from a series of sensors that measure different areas for air leaks. A major leak could affect more than one area, causing multiple trouble codes. Inspect the causes and find the solutions of error code P0455 before you clear the code and see if any other code is still present.
What are the Symptoms of a Large Leak?
Because your EVAP system only handles emissions, you won’t likely see any decrease in the overall performance of your vehicle. Over time, you may notice a slight decrease in fuel economy. When stored in a garage or closed space, you may smell fuel vapors. The worst symptom, however, is increased emissions polluting your environment.
What are the Causes of Error Code P0455?
Because the entire fuel and EVAP system need to be completely sealed in order for the EVAP system to work effectively, even a slight hole or crack in a single component could trigger the error code. You’ll need to carefully inspect your entire EVAP system:
- Fuel tank
- EVAP hoses
- Fuel lines
- Filter canister
- Purge valve
A common cause is a missing or loose gas cap. This easy-to-fix solution could be all you need to restore your EVAP system. However, minor tears, or rotten spots in your EVAP hose could also be the culprit.
Your filter canister may also be cracked. This can happen if you attempt to pressurized your EVAP system with air, so don’t use this as a strategy for finding the air leak. Another component that could be damaged is your purge valve solenoid. Over time, this part may wear out.
Whether you’ve found the cause or not, replacing the damaged component in your EVAP system should restore the seal and keep your fuel vapors contained. Check the easiest solution first by tightening or replacing your fuel cap. After you’ve cleared your error code, code P0455 will return if this wasn’t the source of the air leak.
Next, replacing a section of hose is the next most common issue. While general use shouldn’t damage your EVAP hose, this material can be affected by severe weather or temperature. Finally, if these solutions aren’t effective at solving your error code problem, replace your charcoal filter canister or purge valve. These should be the last components that could create an air leak. A full replacement should solve your OBD-II scanner error code P0455 problem.
Advice, how-to guides, and car care information featured on AutoZone.com and AutoZone Advice & How-To’s are presented as helpful resources for general maintenance and automotive repairs from a general perspective only and should be used at your own risk. Information is accurate and true to the best of AutoZone’s knowledge, however, there may be omissions, errors or mistakes.
Be sure to consult your owner’s manual, a repair guide, an AutoZoner at a store near you, or a licensed, professional mechanic for vehicle-specific repair information. Refer to the service manual for specific diagnostic, repair and tool information for your particular vehicle. Always chock your wheels prior to lifting a vehicle. Always disconnect the negative battery cable before servicing an electrical application on the vehicle to protect its electrical circuits in the event that a wire is accidentally pierced or grounded. Use caution when working with automotive batteries. Sulfuric acid is caustic and can burn clothing and skin or cause blindness. Always wear gloves and safety glasses and other personal protection equipment, and work in a well-ventilated area. Should electrolyte get on your body or clothing, neutralize it immediately with a solution of baking soda and water. Do not wear ties or loose clothing when working on your vehicle.
FREE Loan-A-Tool® program requires returnable deposit. Please note that the tool that you receive after placing an online order may be in a used but operable condition due to the nature of the Loan-A-Tool® program.