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P0455 Toyota Code - Evaporative Emission Control System Gross Leak Detected

Quick Answer

5 hours after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in the Evaporative Emission (EVAP) system. Common causes include Missing or loose filler fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. 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 Toyota indicates Evaporative Emission Control System Gross Leak Detected.
Common causes
Common causes include Missing or loose filler fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
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.
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Code Popularity 138,998
How popular is this code, among other codes? Medium
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Table of contents Created and updated by William Orellana on Aug 31, 2022
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Code P0455 Toyota Description

5 hours after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in the Evaporative Emission (EVAP) system. The Engine Control Module (ECM) monitors for leaks and actuator malfunctions based on the EVAP pressure. The leak detection pump creates negative pressure through the reference orifice. When the system is normal, the EVAP pressure is between 97 to 100 kPa(abs) [726 to 750 mmHg(abs) (Typical value)] and saturated within a minute. If the leak detection pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than [second reference pressure x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large leak, illuminates the MIL, and stores the Diagnostic Trouble Code (DTC).
The Canister Pump Module is attached to the EVAP Canister and contains the Canister Pressure Sensor, the Leak Detection Pump, and the Vent Valve.
OBDII Code P0455 Toyota - Evaporative Emission Control System Gross Leak Detected - AutoCodes.com
P0455 Toyota Code - Evaporative Emission Control System Gross Leak Detected
What does this mean?

What are the Possible Causes of the DTC P0455 Toyota?

  • Missing or loose filler fuel cap
  • Incorrect fuel filler cap used
  • Fuel filler cap remains open or fails to close
  • Foreign matter caught in fuel filler cap
  • Leakage from canister pump module
  • Leakage from fuel tank
  • Leakage from canister

How to Fix the DTC P0455 Toyota?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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.

There is a factory service bulletin for the following Toyota models:

2003-2004 Toyota 4Runner
2003-2004 Toyota Tundra
2004 Toyota Camry
2004 Toyota Sienna
2004 Toyota Highlander
2004 Toyota Solara
Toyota Factory Service Bulletin OBDII Code P0455

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0455 Toyota code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0455 Toyota code?

Need more information on how to fix the P0455 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0455 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota 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 Toyota Code

1. What does the OBDII code P0455 mean for a Toyota?

The code P0455 indicates that the Evaporative Emission Control System has detected a gross leak.

2. What are the common symptoms of a P0455 code in a Toyota?

Common symptoms include the illumination of the check engine light, the smell of fuel vapors, and potential issues with passing emissions tests.

3. What are the possible causes of a P0455 code in a Toyota?

Potential causes include a loose or damaged gas cap, a cracked or damaged EVAP system hose, a faulty EVAP canister, or a malfunctioning purge valve.

4. How serious is a P0455 code in a Toyota?

While a P0455 code may not cause immediate drivability issues, it can negatively impact fuel economy and emissions. It is important to address this code promptly to prevent further damage to the vehicle's emissions system.

5. Can I continue driving my Toyota with a P0455 code?

It is generally safe to drive the vehicle in the short term with a P0455 code, but it is recommended to have the issue diagnosed and repaired as soon as possible to avoid potential long-term problems.

6. How can I diagnose a P0455 code in my Toyota?

Diagnosing a P0455 code typically involves inspecting the gas cap, checking for visible damage to EVAP system hoses, performing a smoke test to detect leaks, and using a scan tool to monitor system performance.

7. What are some DIY repair tips for a P0455 code in a Toyota?

DIY repair tips include ensuring the gas cap is securely tightened, inspecting and replacing damaged hoses, checking the EVAP canister for cracks, and testing the purge valve for proper operation.

8. Will a P0455 code reset itself in a Toyota?

If the underlying issue causing the P0455 code is not addressed, the code may temporarily clear itself but is likely to return once the EVAP system detects the leak again.

9. How much does it typically cost to repair a P0455 code in a Toyota?

The cost of repairing a P0455 code can vary depending on the specific cause of the issue, but it may range from a relatively inexpensive fix like tightening or replacing the gas cap to a more involved repair involving EVAP system components.

10. Can a P0455 code in a Toyota be related to other codes or issues?

Yes, a P0455 code may sometimes be accompanied by other EVAP system-related codes, such as P0440 (Evaporative Emission Control System Malfunction) or P0442 (Evaporative Emission Control System Leak Detected - Small Leak). It is important to address all relevant codes to ensure proper functioning of the emissions system.

1. What does the OBDII code P0455 for Toyota mean?

The P0455 code indicates a "Evaporative Emission Control System Gross Leak Detected" in the vehicle's emission system.

5. How can I diagnose a P0455 code in a Toyota?

Diagnosing a P0455 code typically involves checking the gas cap for proper sealing, inspecting the fuel filler neck and EVAP system components for damage, and using a diagnostic scan tool to pinpoint the exact source of the leak.

6. Can I drive my Toyota with a P0455 code?

It is generally safe to drive your Toyota with a P0455 code, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent potential fuel economy and emission concerns.

7. How much does it cost to repair a P0455 code in a Toyota?

The cost of repairing a P0455 code in a Toyota can vary depending on the exact cause of the issue. Simple fixes like tightening the gas cap may be inexpensive, while replacing more complex components could be more costly.

8. Can a P0455 code in a Toyota clear on its own?

If the root cause of the P0455 code, such as a loose gas cap, is resolved, the check engine light may turn off on its own after several driving cycles. However, it is advisable to have the code cleared with a diagnostic tool to ensure the issue is fully resolved.

9. What are some repair tips for a P0455 code in a Toyota?

Repair tips for a P0455 code may include checking and tightening the gas cap, visually inspecting the EVAP system components for damage, and consulting a professional mechanic for a thorough diagnosis and repair plan.

10. How can I prevent a P0455 code from recurring in my Toyota?

To prevent a P0455 code from recurring in your Toyota, ensure the gas cap is securely tightened after refueling, regularly inspect the EVAP system components for damage, and address any potential issues promptly to maintain proper emission system function.

1. What are the common symptoms of OBDII code P0455 in a Toyota?

The most common symptoms of P0455 include the check engine light turning on, a noticeable fuel smell near the vehicle, and potential difficulty starting the engine.

2. What causes the OBDII code P0455 in a Toyota?

The P0455 code is usually triggered by a gross leak in the evaporative emission control system, which can be caused by a loose gas cap, a cracked or disconnected EVAP hose, or a faulty EVAP canister.

3. How serious is the OBDII code P0455 in a Toyota?

While P0455 is not an immediate danger to vehicle operation, it can negatively impact fuel economy and emissions performance. It is important to address the issue promptly to prevent further problems.

4. Can a loose gas cap trigger the OBDII code P0455 in a Toyota?

Yes, a loose, missing, or improperly sealed gas cap is one of the most common causes of the P0455 code in Toyota vehicles. Always ensure the gas cap is properly tightened after refueling.

5. How can I diagnose the cause of the OBDII code P0455 in my Toyota?

Diagnosing P0455 usually involves checking the gas cap, inspecting the EVAP system components for leaks or damage, using a smoke machine to detect leaks, and testing the purge valve and EVAP canister.

6. What are repair tips for fixing the OBDII code P0455 in a Toyota?

Repairing P0455 may involve tightening or replacing the gas cap, repairing or replacing damaged EVAP hoses, checking and replacing the EVAP canister, and testing or replacing the purge valve.

7. Can I drive my Toyota with the OBDII code P0455?

It is generally safe to drive your Toyota with the P0455 code, but it is recommended to address the issue promptly to prevent potential fuel economy and emissions problems.

8. How much does it cost to repair the OBDII code P0455 in a Toyota?

The cost of repairing P0455 can vary depending on the specific cause of the issue, but it may range from around $100 for a simple fix like a gas cap replacement to several hundred dollars for more extensive repairs.

9. Can a DIY enthusiast fix the OBDII code P0455 in a Toyota?

Yes, some aspects of diagnosing and repairing P0455 can be tackled by DIY enthusiasts, especially simple fixes like checking the gas cap or inspecting visible EVAP hoses. However, more complex repairs may require professional help.

10. How can I prevent the OBDII code P0455 from recurring in my Toyota?

To prevent the recurrence of P0455, make sure to tighten the gas cap properly after refueling, perform regular maintenance checks on the EVAP system, and address any issues promptly to avoid gross leaks.

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