P0455: How to Diagnose & Fix — Evaporative Emission Control System Leak Detected (Gross Leak)
51 vehicles · 21 makes · $20-$5,300 repair
How to diagnose and fix P0455: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Chrysler 300 · 2011–2023
Evaporative emission control system develops small leaks triggering P0456 code. Most commonly failed gas cap, chaffed EVAP purge pipe harness, or failed purge solenoid. Triggers check engine light and prevents emissions testing pass.
Common Symptoms
- Check engine light with P0456 code
- "Gas cap" warning even with cap tight
- Fuel smell near vehicle
- Failed emissions test
- No performance or drivability issues
How to Fix
Start with gas cap replacement ($20-40). If code returns, smoke test EVAP system to locate leak. Common fixes: replace purge solenoid, repair chaffed wiring harness, or replace cracked EVAP hoses.
Sources for this issue (1)
Dodge Journey · 2009–2020
AC compressor fails due to inadequate lubrication, leaky seals, and internal mechanical failure. Evaporator develops leaks from age and moisture. Condenser prone to damage from road debris. Lack of lubrication from leaks causes compressor seizure.
Common Symptoms
- AC blows warm air
- AC works intermittently
- Compressor clutch not engaging
- Loud grinding or squealing from compressor
- Musty odor from vents (evaporator mold)
How to Fix
Diagnose AC system to identify leak source. Replace failed compressor ($400-800), evaporator ($300-600), or condenser ($200-400) as needed. Flush AC system when replacing compressor. Replace receiver/drier whenever system opened.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Mopar 55111410AF complete A/C compressor
Replace a compressor confirmed failed on the listed configuration Fitment: 2016-2020 Journey 2.4L on the product fitment table; not the 3.6L compressor Live OEM direct-product page when checked
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (1)
Chevrolet HHR · 2006–2011
The HHR has a documented issue with fuel line corrosion, particularly in rust belt states. The fuel line corrodes just forward of the driver-side rear wheel, developing leaks that create a fire hazard. Road salt and debris accelerate the corrosion. The issue is most commonly seen on vehicles in the northeastern and midwestern United States where road salt is used heavily in winter.
Common Symptoms
- Gasoline smell near the vehicle
- Visible fuel drip under vehicle near rear driver-side wheel
- Fuel economy decreasing noticeably
- Rust or corrosion visible on fuel lines during inspection
- Check engine light with evaporative system codes
How to Fix
Inspect fuel lines annually, especially near the driver-side rear wheel. If corrosion is found, replace the affected fuel line section with stainless steel or nylon-coated replacement lines. Do not use tape or sealant on fuel lines - full section replacement is required. Cost is $200-$500 at an independent shop.
Sources for this issue (2)
Volvo V70 · 2001–2004
Kia Sorento · 2011–2020
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P0455 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
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 $5,300, depending on the vehicle and root cause.
Which vehicles are affected by P0455?
Au7o has documented P0455 across 51 vehicle models from 21 manufacturers: Acura, Buick, Chevrolet, Chrysler, Dodge, Ford, GMC, Honda, Hyundai, Infiniti, Jeep, Kia, Mazda, Nissan, Porsche, RAM, Saturn, Subaru, Toyota, Volkswagen, Volvo.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.