P0457
Low SeverityEVAP System Leak Detected (Fuel Cap Loose/Off)
EVAP System
P0457 — Instant Answer
EVAP System Leak Detected (Fuel Cap Loose/Off)
Severity: LOW SEVERITY
Meaning: Specifically triggered by a loose or missing fuel cap. Some vehicles have a dedicated sensor for this.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $5 - $15
Most common causes:
- 1. Loose gas cap (35-45% of cases)
- 2. Damaged gas cap seal (35-45% of cases)
- 3. Missing gas cap (10-25% of cases)
Symptoms
- ⚠️Check engine light
- ⚠️Gas cap warning message on some vehicles
Related Symptoms
Common Causes
How to Diagnose P0457
- 1Remove and reinstall gas cap until it clicks
- 2Inspect cap seal for cracks
- 3Replace cap if seal is damaged
OEM Diagnostic Flowchart
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Parts & Tools for This Job
Common parts shoppers buy for P0457 EVAP System Leak Detected (Fuel Cap Loose/Off).
Oxygen Sensor
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Catalytic Converter
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EVAP Purge Valve
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Gas Cap
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OBD2 scanner
Read codes and freeze-frame data before you guess at the fault.
Most diagnostic jobs start with a scan tool and a verified code path.
Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsRelated Resources
Repair guides, symptom pages, and wiring diagrams related to P0457.
OEM Manual Evidence
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Related Symptoms
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Open the exact vehicle hub grounded by OEM manual evidence related to P0457.
Open the exact vehicle hub grounded by OEM manual evidence related to P0457.
Related Codes
A significant leak in the EVAP system. Often a loose gas cap or a disconnected hose.
General EVAP system fault — the system that captures fuel vapors is not working properly.
A small leak in the EVAP system, often a deteriorated gas cap seal or a tiny crack in a hose.
Frequently Asked Questions
- Will a gas cap fix P0457?
- Almost always yes — P0457 is specifically the gas cap code on many vehicles.
- How much is a replacement gas cap?
- OEM gas caps are $10-$25. Aftermarket caps are $5-$15 but make sure they have the right seal for your vehicle.
Find your service manual
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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-11-02