P0455: Evaporative Emission Control System Leak Detected (Gross Leak)
45 vehicles · 17 makes · $20-$2,500 repair
Most Reported On
P0455 is an OBD-II diagnostic trouble code meaning “Evaporative Emission Control System Leak Detected (Gross Leak).” This code means your car's evaporative emission (EVAP) system has detected a large (gross) leak, so fuel vapors that should be sealed inside the fuel and vapor system are escaping into the atmosphere. The EVAP system captures gasoline vapors from the tank and routes them to the engine to be burned instead of polluting the air, and the computer periodically pressure- or vacuum-tests this sealed system. A gross leak almost always points to something obvious and easy, like a loose, missing, or bad gas cap, rather than a deep mechanical failure. It rarely affects how the car drives, but it should be fixed to pass emissions and stop wasting fuel vapor. This code is most commonly reported on 2011-2023 Chrysler 300, 2007-2014 Toyota FJ Cruiser, and 2016-2023 Toyota Tacoma, plus 42 other vehicles, with repair costs ranging from $20 to $2,500.
Common Causes
Typical Repair Cost
Based on 48 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0455, 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
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (45)
Fuel Line Corrosion and Leak Near Rear Wheel
EVAP Vent Valve and Charcoal Canister Dust Ingestion Causing Check Engine Light and Hard Refueling
EVAP Purge Valve Failure Causing Rough Idle, Stalling and Hard Starts (P0496) — GM Special Coverage N232395300
EVAP Canister Purge Valve Stuck Open Causing P0496 / Rough Running (3.0L & 3.6L V6)
P0455 — Gross EVAP Leak from Loose/Failed Gas Cap or Stuck Purge Valve
EVAP Vent Solenoid Clogging With Dust/Water Causing Check Engine Light and Hard Refueling
AC Compressor Failure and Evaporator Leaks
EVAP Leak Detection (ESIM/NVLD) Module Failure Triggers False P0455/P0456 Codes
EVAP Leak Detection Pump (ESIM) Failure Causes Persistent P0455/P0456 — Often Misdiagnosed as a Gas Cap
Fuel Tank Cracking and Fuel Vapor/Fuel Leak at Tank Seam or EVAP Area
Fuel Filler Neck and Strap Corrosion Causing Fuel Leaks or Tank Movement
EVAP Canister Purge Valve Stuck Open — Hard Start After Refueling, Rough Idle, P0455/P0496
P0455 — Gross EVAP Leak from Capless Filler Neck or Purge Valve
EVAP Canister Purge Valve Failure Triggering Small-Leak Check-Engine Codes
EVAP Purge Valve Stuck/Leaking - Check Engine Light and Rough Running
EVAP Canister Purge Valve Sticking - P0455 / P0496 / P0441
P0455 — Gross EVAP Leak from a Failed Gas Cap or Stuck-Open Purge/Vent Valve
P0455 — Gross EVAP Leak from Bad Gas Cap Seal, Filler Neck, or Stuck Vent Valve
EVAP Canister Purge Valve Stuck Open (P0496/P0455) Causing Hard Start After Refueling
A/C Compressor Premature Failure
P0455 — Gross EVAP Leak from Gas Cap, Purge Solenoid, or Canister Close Valve
Evaporative Emissions Leak from Deteriorated Purge/Canister Hoses and Loose Fuel Filler Neck Components
Rear A/C System Failure
EVAP Canister Vent Control Valve Failure (P0455 / P0456 Leak Codes)
EVAP Canister and Vent Control Valve Failure Triggering Check Engine Light
Fuel Filler Neck Corrosion and Rust-Through Triggering EVAP Leaks and Fuel Smell
EVAP Vent Control Valve / Charcoal Canister Faults Triggering Check Engine Light and Hard Refueling
A/C Compressor and Evaporator Failure
A/C Musty/Mold Smell
EVAP System Leak-Detection / Vapor Canister Fault (Check Engine Light, Hard Refueling)
EVAP Purge Valve / Charcoal Canister Failure — P0441 / P0455 & Fuel-Pump Click-Off
EVAP Charcoal Canister and Vent Valve Failure Causing Check Engine Light
Evaporative Emissions Leak Faults from Charcoal Canister, Vent Valve, or Filler Neck Corrosion
FAQ
What does P0455 mean?
P0455 stands for "Evaporative Emission Control System Leak Detected (Gross Leak)." This code means your car's evaporative emission (EVAP) system has detected a large (gross) leak, so fuel vapors that should be sealed inside the fuel and vapor system are escaping into the atmosphere. The EVAP system captures gasoline vapors from the tank and routes them to the engine to be burned instead of polluting the air, and the computer periodically pressure- or vacuum-tests this sealed system. A gross leak almost always points to something obvious and easy, like a loose, missing, or bad gas cap, rather than a deep mechanical failure. It rarely affects how the car drives, but it should be fixed to pass emissions and stop wasting fuel vapor.
What are the most common causes of P0455?
The most common causes of P0455 are: Loose, missing, or improperly tightened gas cap, Worn, cracked, or failed gas cap seal, Cracked or disconnected EVAP/vapor hose, Damaged or missing fuel filler neck seal, Faulty EVAP purge valve stuck open, Failed EVAP vent valve, Cracked or damaged charcoal canister. The specific cause varies by vehicle.
How much does it cost to fix P0455?
Repair costs for P0455 range from $20 to $2,500, depending on the vehicle and root cause.
Which vehicles are affected by P0455?
Au7o has documented P0455 across 45 vehicle models from 17 manufacturers: Chevrolet, Chrysler, Dodge, Ford, GMC, Honda, Hyundai, Infiniti, Jeep, Kia, Mazda, Nissan, Ram, Saturn, Subaru, Toyota, Volkswagen.
Sources (12)
- ForumReddit r/ToyotaTacoma thread discussing musty smell in 2016 Tacoma A/C
- ForumMazdas247 Forum - 2006 Mazda5 A/C evaporator leak / dash removal discussion
- owner-reportHHR Fuel Line Corrosion Issue - ChevroletProblems.com
- ForumOwner forum discussions on rusted Ranger fuel tank straps and filler neck replacement
- ForumESIM (Evap System Integrity Module) Installation fixed P0456 code | Dodge Charger Forum
- 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
- articleP0455 on 2016-2022 Dodge Charger: EVAP Large Leak Causes and Fixes | Go-Parts.com
- articleP0457 Dodge Charger: EVAP System – Leak Detected | Drivetrain Resource
- Forum001109 — EVAP System: Large Leak Detected (VWVortex)
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.