Auxiliary Emissions ControlOBD2 Codes

P0455 – Meaning, Causes, Symptoms, & Fixes

P0455 system gross leak evaporative system malfunction

Code P0455 Definition

The vehicle has detected a big evaporative system leak.

What Does Code P0455 Mean?

The evaporative emission control (EVAP) system prevents fuel vapors from escaping into the atmosphere. The fuel vapors from the fuel tank are captivated and stored by charcoal pellets in the charcoal canister. The vent control valve is controlled by the engine control module (ECM) and allows air to menses into the charcoal canister to purge the gas vapors into the engine air intake to be burned. The flow of the gas vapors from the charcoal canister to the engine air intake is controlled by a purge valve. The vent command valve is normally opened when the engine is on, and the purge volume control valve is commonly closed and is controlled past the ECM to open up when information technology is ready to purge the stored fuel vapors from the charcoal canister. Yet, the ECM occasionally performs leak tests to ensure the evaporative emission control system is working properly when the vehicle is turned off. During the leak exam, the ECM closes the vent control valve to create a sealed EVAP system. If the EVAP system does not maintain the force per unit area, the ECM recognizes an evaporative emission control leak. In the case of P0455, it is a very large leak. This is usually indicative of a loose, broken, or missing gas cap.

What Are The Symptoms Of Code P0455?

  • Check Engine Light is on
  • Decreased fuel economy
  • Fuel smell

What Is The Cause Of Code P0455?

  • Missing, defective, damaged, or loose  cap (*Most Mutual)
  • Faulty or stuck EVAP vent control valve
  • Faulty or stuck EVAP purge volume control valve
  • Cracked or disconnected EVAP hose
  • Croaky or damaged charcoal canister

How Serious Is Code P0455? – Low

The commuter volition probable not notice any symptoms associated with P0455 other than the bank check engine light being on. If the fuel odor is very strong and it is apparent that in that location are leaks, have your vehicle to your repair shop as presently as possible. The most mutual problems with code P0455 is a loose gas cap or croaky EVAP hose.

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Code P0455 Common Diagnosis Mistakes

Many people fail to perform a smoke test before or after replacing the fuel cap and spring straight to component replacement. The problem could be as elementary as a loose or cracked EVAP hose.

Tools Needed to Diagnose Code P0455

  • FIXD
  • Pliers or screwdriver to secure a loose hose(southward)
  • EVAP smoke car leak checker

How To Diagnose And Repair Code P0455:

Difficulty of Diagnosis and Repair – 2 out of 5

  1. Scan your vehicle to verify P0455 is the only code present. If other codes are nowadays, they must be addressed first.
    1. If yous accept code P0441, P0440, or code P0456, the cause of the codes is nearly likely a solenoid failure, or a more complex arrangement leak. These issues must be addressed first.
  2. Cheque your gas cap to run into if it is loose or damaged.
    1. If your gas cap is loose, tighten it and clear the lawmaking.
    2. Inspect your gas cap for physical damage or deterioration. Withal, it should exist noted that impairment to the gas cap or deterioration of its components is not always noticeable. If your gas cap was not loose and you exercise not see whatever indications of failure, try replacing the gas cap anyhow and clearing the codes. Gas caps are relatively inexpensive and are usually the fix for code P0455.
  3. If the fuel cap didn't fix it, perform an EVAP system leak check:
    1. Compression off the vent tube to the EVAP Vent Control Valve.
    2. Pressurize the EVAP organization with an EVAP smoke motorcar leak checker.
    3. Check to run across if you come across any smoke leaking out from any hoses or seals. If there are any leaks, repair leaks, cleared the check engine light, and check to see if the business organisation is resolved.*

*If code returns, yous will need to be given further diagnostics by a mechanic. More diagnostic steps could require electrical testing of the purge and vent command valves for proper operation.

Estimated Price of Repair

For error code P0455, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the toll of labor required to make the repair.

  • Gas Cap $20-$60
  • EVAP Line $twenty-$100
  • EVAP Vent Command Valve $150-$200
  • Purge Volume Control Valve $150-$200

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