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P0455 2003 Ford F150 Code - Evaporative Emission Control System Leak Detected Gross Leak

Quick Answer

The P0455 diagnostic trouble code (DTC) for a 2003 Ford F150 indicates that there is a large leak in the evaporative emission control system. Common causes include Loose or damaged fuel cap, Cracked or damaged hoses in the evaporative emission control system, Faulty purge valve. 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 2003 Ford F150 indicates Evaporative Emission Control System Leak Detected Gross Leak.
Common causes
Common causes include Loose or damaged fuel cap, Cracked or damaged hoses in the evaporative emission control system, Faulty purge valve.
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 10, 2024
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Code P0455 2003 Ford F150 Description

The P0455 diagnostic trouble code (DTC) for a 2003 Ford F150 indicates that there is a large leak in the evaporative emission control system. This system is responsible for capturing and storing fuel vapors that would otherwise be released into the atmosphere. When a gross leak is detected, it means that there is a significant issue with the system's ability to contain these harmful emissions.

OBDII Code P0455 2003 Ford F150 - Evaporative Emission Control System Leak Detected Gross Leak
P0455 2003 Ford F150 Code - Evaporative Emission Control System Leak Detected Gross Leak

Common Causes of P0455 2003 Ford F150

  1. Loose or damaged fuel cap
  2. Cracked or damaged hoses in the evaporative emission control system
  3. Faulty purge valve
  4. Leaking charcoal canister
  5. Malfunctioning fuel tank pressure sensor

Symptoms of P0455 2003 Ford F150

  1. Check engine light illuminated
  2. Strong fuel odor inside and/or outside the vehicle
  3. Decreased fuel efficiency
  4. Hissing or whistling noises coming from the fuel tank area
  5. Difficulty starting the engine

How to Fix P0455 2003 Ford F150

  1. Inspect the fuel cap for any visible damage and ensure it is securely tightened. Replace if necessary.
  2. Check all hoses and connections in the evaporative emission control system for cracks, leaks, or damage. Replace any faulty components.
  3. Test the purge valve to ensure it is functioning properly. Replace if necessary.
  4. Inspect the charcoal canister for leaks or damage. Replace if needed.
  5. Test the fuel tank pressure sensor to determine if it is sending accurate readings. Replace if faulty.

Cost to Fix P0455 2003 Ford F150

The cost of repairing a P0455 code on a 2003 Ford F150 can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, you can expect to pay anywhere from $100 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates can vary between auto repair shops, so it's advisable to get a few quotes from different locations to ensure you're getting a fair price.

What does this mean?

Tech Notes for P0455 2003 Ford F150

The P0455 is a common code since it will 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 clear by disconnecting the car battery for about 30 minutes.



The PCM monitors the complete EVAP control system for no purge flow, the presence of a large fuel vapor leak, or multiple small fuel vapor leaks. The system failure occurs when no purge flow (attributed to fuel vapor blockages or restrictions), a large fuel vapor leak, or multiple fuel vapor leaks are detected by the EVAP running loss monitor test with the engine running (but not at idle).



There is a factory service bulletin for the 2003 Ford F-150:

2003 Ford F-150 Factory Service Bulletin OBDII Code P0455

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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 2003 Ford F150 Code

1. What does the OBDII code P0455 for a 2003 Ford F150 indicate?

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 2003 Ford F150?

Common symptoms may include the check engine light coming on, a strong fuel odor near the vehicle, and potential issues with fuel efficiency.

3. What are some possible causes of a P0455 code in a 2003 Ford F150?

Potential causes include a loose or damaged gas cap, a leak in the fuel tank or fuel lines, a faulty evaporative emission control system pressure sensor, or a cracked vacuum hose.

4. How serious is a P0455 code in a 2003 Ford F150?

While the vehicle may still be driveable with this code, it is important to address it promptly to prevent potential fuel leaks or emissions issues.

5. How can I diagnose a P0455 code in my 2003 Ford F150?

Diagnosing a P0455 code may involve visually inspecting the fuel cap and related components, performing a smoke test to identify leaks, and using a scan tool to monitor system parameters.

6. Can I repair a P0455 code in my 2003 Ford F150 myself?

Depending on the cause of the code, you may be able to address it yourself by tightening or replacing the gas cap, repairing a damaged hose, or replacing a faulty sensor. However, more complex issues may require professional diagnosis and repair.

7. Are there any specific repair tips for fixing a P0455 code in a 2003 Ford F150?

When addressing a P0455 code, start by checking and tightening the gas cap. If the issue persists, inspect the fuel system components for leaks and test the evaporative emission control system components for proper operation.

8. How much does it typically cost to repair a P0455 code in a 2003 Ford F150?

The cost of repairing a P0455 code can vary depending on the cause of the issue and whether you perform the repairs yourself or take the vehicle to a mechanic. Costs may range from a simple gas cap replacement to more extensive repairs.

9. Can a P0455 code in a 2003 Ford F150 cause emissions test failure?

Yes, a P0455 code can cause emissions test failure due to the vehicle's evaporative emission control system not functioning properly. It is important to address the code before attempting an emissions test.

10. How long can I safely drive with a P0455 code in my 2003 Ford F150?

It is recommended not to ignore a P0455 code for an extended period, as it can lead to fuel leaks and emissions issues. It is best to address the code as soon as possible to prevent further problems.

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