P0457: Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)
7 vehicles · 4 makes · $25-$1,800 repair
Most Reported On
P0457 is an OBD-II diagnostic trouble code meaning “Evaporative Emission System Leak Detected (Fuel Cap Loose/Off).” This code means the engine computer detected a large leak in the sealed fuel-vapor (EVAP) system, most often traced to a loose, missing, or poorly sealing gas cap. The EVAP system is supposed to trap gasoline vapors and burn them in the engine instead of releasing them into the air; a big leak lets those vapors escape. It is an emissions-only fault that will not hurt the engine, though it triggers the check-engine light and can cause a faint fuel smell. This code is most commonly reported on 2005-2023 Chrysler 300 (300, 300 Touring, 300 Limited, 300C, 300S, 300 SRT8), 2011-2019 Ford Fiesta, and 2005-2010 Ford Mustang, plus 4 other vehicles, with repair costs ranging from $25 to $1,800.
Common Causes
Typical Repair Cost
Based on 7 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0457, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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Vehicles Affected (7)
FAQ
What does P0457 mean?
P0457 stands for "Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)." This code means the engine computer detected a large leak in the sealed fuel-vapor (EVAP) system, most often traced to a loose, missing, or poorly sealing gas cap. The EVAP system is supposed to trap gasoline vapors and burn them in the engine instead of releasing them into the air; a big leak lets those vapors escape. It is an emissions-only fault that will not hurt the engine, though it triggers the check-engine light and can cause a faint fuel smell.
What are the most common causes of P0457?
The most common causes of P0457 are: Loose, missing, or improperly tightened fuel cap, Worn or cracked fuel cap seal/gasket, Damaged fuel filler neck or sealing surface, Cracked or disconnected EVAP hose, Stuck-open purge or vent valve, Faulty fuel cap that won't hold pressure, Leaking charcoal canister. The specific cause varies by vehicle.
How much does it cost to fix P0457?
Repair costs for P0457 range from $25 to $1,800, depending on the vehicle and root cause.
Which vehicles are affected by P0457?
Au7o has documented P0457 across 7 vehicle models from 4 manufacturers: Chrysler, Dodge, Ford, Jeep.
Sources (12)
- ForumP0456 EVAP System Very Small Leak — Chrysler 300C & SRT8 Forums (owner reports 8 dealer visits, ESIM/seal/filler neck/purge valve/canister replaced)
- ForumGetting code P0456! Someone help — Chrysler 300 Forum
- ForumESIM (Evap System Integrity Module) installation fixed P0456 code — Dodge Charger Forum (shared LX platform/ESIM with the 300)
- articleP0456 on 2012-2019 Chrysler 300: EVAP Small Leak Causes and Fixes — Go-Parts
- articleP0455 on 2016-2022 Chrysler 300: EVAP System Large Leak Causes & Fixes — Go-Parts
- articleChrysler 300 P0457: EVAP System – Leak Detected — Drivetrain Resource
- articleChrysler 300 Fuel Evaporative Canister Replacement Cost ($417-$476) — RepairPal
- articleChrysler 300 Leak Detection Pump Replacement Cost — YourMechanic
- Forumthrowing code P0456 - evaporative emissions system leak | Dodge Charger Forum
- ForumP0456 evap small leak | Dodge Charger Forum
- ForumCode: P0456 finally Resolved!........$2,500.00 later!!!! (fuel-tank pinhole) | Dodge Challenger Forum
- articleP0456 on 2012-2019 Dodge Charger: EVAP Small Leak Causes and Fixes | Go-Parts.com
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.