AutoCodes – Ford – P0457 2008 Ford Fusion

P0457 2008 Ford Fusion Code - EVAP Control System Leak Detected Fuel Filler Cap Loose/Off

Quick Answer

The Powertrain Control Module (PCM) continuously monitors the fuel level and retains the last updated value prior to the ignition switch being placed in the OFF position. Common causes include Missing fuel filler 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: P0457 2008 Ford Fusion indicates EVAP Control System Leak Detected Fuel Filler Cap Loose/Off.
Common causes: Common causes include Missing fuel filler 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 2,624

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0457 2008 Ford Fusion Description

The Powertrain Control Module (PCM) continuously monitors the fuel level and retains the last updated value prior to the ignition switch being placed in the OFF position. After the ignition switch is placed in the ON position a new fuel level is taken and compared to the level recorded at ignition off. If the fuel level has increased, a flag is set in the PCM indicating the vehicle was refueled. If the evaporative emission (EVAP) monitor detects a gross leak while the refueling flag is set, a loose fuel filler cap or an incorrectly sealed fuel tank filler pipe (if equipped) is suspected and the DTC is set. On most vehicles when the DTC sets, either the check fuel cap indicator illuminates or a message on the instrument cluster displays to instruct the driver to check the fuel cap or capless fuel tank filler pipe (if equipped).

OBDII Code P0457 2008 Ford Fusion - EVAP Control System Leak Detected Fuel Filler Cap Loose/Off - AutoCodes.com — P0457 2008 Ford Fusion Code - EVAP Control System Leak Detected Fuel Filler Cap Loose/Off

What does this mean?

What are the Possible Causes of the DTC P0457 2008 Ford Fusion?

Missing fuel filler cap
Incorrect fuel filler cap used
Fuel filler cap remains open or fails to close
Foreign matter caught in fuel filler cap

How to Fix the DTC P0457 2008 Ford Fusion?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0457 2008 Ford Fusion 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.

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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 P0457 2008 Ford Fusion Code

1. What does the OBDII code P0457 mean on a 2008 Ford Fusion?

P0457 indicates that the EVAP (Evaporative Emission Control) system has detected a leak, often caused by a loose or missing fuel filler cap.

2. What are the symptoms of the P0457 code on a 2008 Ford Fusion?

Common symptoms include the check engine light being illuminated and a possible fuel smell near the vehicle. There are usually no significant drivability issues.

3. What causes the P0457 code to trigger on a 2008 Ford Fusion?

The most common cause is a loose, damaged, or missing gas cap. Other potential causes include leaks in the EVAP system hoses, a faulty purge valve, or a defective EVAP canister.

4. Can I drive my 2008 Ford Fusion with the P0457 code?

Yes, the car is generally safe to drive, but it is recommended to address the issue promptly to avoid potential emissions system damage and to pass emissions tests.

5. How do I fix the P0457 code on a 2008 Ford Fusion?

Start by ensuring the gas cap is properly tightened or replaced if damaged. If the issue persists, inspect the EVAP system for leaks or defective components, such as hoses or the purge valve.

6. How can I prevent the P0457 code from appearing again in my 2008 Ford Fusion?

Always tighten the gas cap until it clicks after refueling. Regularly inspect the gas cap and EVAP system for wear or damage.

7. How do I diagnose the P0457 code on a 2008 Ford Fusion?

First, check the gas cap for proper installation or damage. If the cap is fine, use a smoke machine to detect leaks in the EVAP system or inspect EVAP components for faults.

8. Will replacing the gas cap clear the P0457 code on my 2008 Ford Fusion?

If the gas cap was the cause, replacing or properly tightening it should resolve the issue. You may need to clear the code with an OBDII scanner or drive the car until the system resets.

9. What tools are needed to troubleshoot the P0457 code on a 2008 Ford Fusion?

You may need an OBDII scanner, a smoke machine to test for leaks, and basic tools to inspect and replace EVAP components.

10. How much does it cost to repair the P0457 code on a 2008 Ford Fusion?

Fixing a loose or damaged gas cap typically costs $10â€“$30. Repairs for leaks or faulty EVAP components can range from $50 to $300, depending on the issue.