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AutoCodes – Generic – P0457

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

Quick Answer

This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. Common causes include Damaged, missing or loosely installed fuel filler cap. 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 indicates EVAP Control System Leak Detected Fuel Filler Cap Loose/Off.
Common causes
Common causes include Damaged, missing or loosely installed fuel filler cap.
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 24,737
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code P0457 Description

This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.
OBDII Code P0457 - EVAP Control System Leak Detected Fuel Filler Cap Loose/Off - AutoCodes.com
P0457 Code - EVAP Control System Leak Detected Fuel Filler Cap Loose/Off
What does this mean?

What are the Possible Causes of the DTC P0457?

  • Damaged, missing or loosely installed fuel filler cap

How to Fix the DTC P0457?

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

Check for a loose, missing or damage fuel filler the cap.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0457 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 P0457 code?

Need more information on how to fix the P0457 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0457 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

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 Code

No Frequently Asked Questions about P0457 Code found.

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