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Engine-Codes – Scion – P0455 Scion

P0455 Scion Code - Evaporative Emission Control System Gross Leak Detected

Quick Answer

The P0455 code for a Scion indicates that the Evaporative Emission Control System has detected a gross leak. Common causes include Loose or Damaged Gas Cap: A loose or damaged gas cap is a common cause of a gross leak in the Evaporative Emission Control System, Cracked or Disconnected Hoses: Hoses connecting various components of the system can crack or become disconnected, leading to leaks, Faulty Purge Valve: The purge valve is responsible for controlling the flow of fuel vapors to the engine. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
P0455 Scion indicates Evaporative Emission Control System Gross Leak Detected.
Common causes
Common causes include Loose or Damaged Gas Cap: A loose or damaged gas cap is a common cause of a gross leak in the Evaporative Emission Control System, Cracked or Disconnected Hoses: Hoses connecting various components of the system can crack or become disconnected, leading to leaks, Faulty Purge Valve: The purge valve is responsible for controlling the flow of fuel vapors to the engine.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P0455 Scion Description

The P0455 code for a Scion indicates that the Evaporative Emission Control System has detected a gross leak. This system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from escaping into the atmosphere. When a gross leak is detected, it means that a significant amount of fuel vapor is escaping, which can lead to increased emissions and decreased fuel efficiency.

OBDII Code P0455 Scion - Evaporative Emission Control System Gross Leak Detected
P0455 Scion Code - Evaporative Emission Control System Gross Leak Detected

Common Causes of P0455 Scion

  1. Loose or Damaged Gas Cap: A loose or damaged gas cap is a common cause of a gross leak in the Evaporative Emission Control System.
  2. Cracked or Disconnected Hoses: Hoses connecting various components of the system can crack or become disconnected, leading to leaks.
  3. Faulty Purge Valve: The purge valve is responsible for controlling the flow of fuel vapors to the engine. A faulty valve can cause leaks.
  4. Leak in Fuel Tank: A leak in the fuel tank itself can also lead to a gross leak in the system.

Symptoms of P0455 Scion

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Strong Fuel Odor: A noticeable fuel odor inside or outside the vehicle may indicate a leak in the Evaporative Emission Control System.
  3. Decreased Fuel Efficiency: Since fuel vapors are escaping, the engine may not be running as efficiently, leading to decreased fuel efficiency.
  4. Failed Emissions Test: If the vehicle is subject to emissions testing, a gross leak in the Evaporative Emission Control System will likely cause it to fail.

How to Fix P0455 Scion

  1. Check Gas Cap: Start by checking the gas cap to ensure it is properly tightened. If it is loose or damaged, replace it with a new one.
  2. Inspect Hoses: Inspect all hoses connected to the Evaporative Emission Control System for cracks or disconnections. Replace any damaged hoses.
  3. Test Purge Valve: Test the purge valve to ensure it is functioning correctly. Replace it if it is faulty.
  4. Pressure Test System: Perform a pressure test on the Evaporative Emission Control System to identify any leaks. Repair or replace any components as necessary.
  5. Clear Code: After making the necessary repairs, clear the diagnostic trouble code from the vehicle's computer using a scan tool.

Cost to Fix P0455 Scion

The cost of repairing a P0455 code on a Scion can vary depending on the specific cause of the issue and the labor rates in your area. In general, the cost of parts for this repair can range from $50 to $200, with labor costs adding an additional $100 to $200. Overall, you can expect to pay anywhere from $150 to $400 for this repair. Keep in mind that actual costs may vary based on your location, the make and model of your vehicle, and the extent of the repairs needed. It's recommended to consult with a qualified mechanic for a more accurate estimate.

What does this mean?

Tech Notes for P0455 Scion

The P0455 is a quite common code because the code is set if the gas cap is loose or missing. Start by tightening the gas cap and clearing the code. In most cases, the code can be cleared by disconnecting the car battery for about 30 minutes.

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Information for Specific Scion Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0455 Scion Code

No Frequently Asked Questions about P0455 Scion Code found.

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  • can a gross evap leak trip a lean burn code PO171?

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  • It's possible, if the EVAP leaks into the engine.

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  • P0455 is a leak issue which normally you can expect the gas cap oring has gone bad or a bad vacuum hose in the evap system. However, do not forget to check something else. Let me tell you about a smog test I just got on my 2011 Toyota sienna. The car runs like new, very clean and low mileage. I was planning to sell it but a person who called about it reminded me that I had to smog first before it sold. That day, I took it down and had it smogged which passed with flying colors. What I did not expect was filling the car with gas and parking it in my driveway and washing, cleaning and shining chrome. With less than a mile since the smog was done, all of a sudden all lights went off on the dash. My code reader read P0451. I checked all sensors thinking he unplugged them or a vacuum line, starting at engine and working my way back to rear of car. I had found something strange under the rear wheel which looked like a jack mark on what looked like metal but was plastic. Upon further examination, there were dried chemical marks and behind the plastic was my gas tank fuel line hose. After removing this cover, I found two holes cut into this hose from the plastic cover which must of been leaking until all the gas drained out. I had replaced the gas fill line to the tank and heated up the plastic cover to correct the bends and breaks in the plastic, and put on a label stating not to jack here, FUEL LINE. Stared the car and checked the code reader which now reads cleared. In reality, Toyota should have made this cover in metal or aluminum or some sort of protection to prevent this issue. The put an arrow on the side of the car at bottom indicating to jack here. So I do not blame the smog guy. The lip you can jack from is very small but thos plastc cover looks like the frame of the car. I bet this happens to more cars then we know. Rob

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  • Thank you for sharing!!

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