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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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.
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Author & Review
Written by AllOEMManuals Editorial Team. Reviewed by ASE-certified technicians and updated with factory-reference checks for fitment-sensitive steps.
This guide was drafted with AI assistance and reviewed for accuracy by a human editor.
Last updated: 2026-05-07