P0455: How to Diagnose & Fix — Evaporative Emission Control System Leak Detected (Gross Leak)
43 vehicles · 19 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.
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)
GMC Sierra 1500 · 2014–2015
GM says a strong fuel odor during fueling or at idle, with possible P0442 or P0455, may be caused by a fracture of the gasoline filler neck recirculation (vent) line connector. 2014-2015 GMC Sierra 1500 except Regular Cab, per GM bulletin 15-NA-019 (December 2015).
How to Fix
Have a technician raise the truck and inspect the fuel tank filler vent hose connector. Bulletin 15-NA-019 says to replace the fuel tank filler vent hose if the connector is damaged (GM part 22802073 is listed for 2013-2015 Sierra except Regular Cab) and to continue normal diagnosis if it is not. Normal warranty rules apply; this is not a recall or a promise of free repair.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (1)
Toyota Corolla · 2000–2008
Corollas in the 8th- and 9th-generation range (2000-2008) commonly develop EVAP system faults from a failing charcoal canister, stuck vent valve, or related vacuum switching valve problems. Owners typically report a persistent check engine light with no major drivability issue, but the vehicle fails emissions inspection and may be difficult to refuel if the vent path is restricted. Toyota service literature and repair databases frequently reference canister-related EVAP diagnosis on these years.
Common Symptoms
- check engine light on
- emissions test failure
- difficulty filling fuel tank
- fuel nozzle clicks off repeatedly
- stored EVAP leak or vent codes
How to Fix
Diagnosis involves smoke-testing the EVAP system, checking vent valve operation, inspecting hoses for cracks, and verifying purge and canister switching valves. Depending on the exact failure, repair may involve replacing the charcoal canister assembly, vent valve, or damaged hoses, then clearing codes and confirming the EVAP monitor completes normally.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota 77740-02102 genuine charcoal canister assembly
confirmed leaking or functionally failed early-generation canister Fitment/availability: 2000-2002 Toyota Corolla catalog branch; replaces 77740-02100 and 77740-02101; confirm VIN and emissions equipment Fitment/availability: Ships in 1-…
- Toyota 77740-02121 genuine charcoal canister assembly
confirmed failed early ninth-generation canister Fitment/availability: 2003-2005 Toyota Corolla catalog branch, generally the early production split through approximately May 2004; exact build date and VIN required Fitment/availability: …
- Toyota 77740-02130 genuine charcoal canister assembly
confirmed failed later ninth-generation canister Fitment/availability: 2004-2013 Toyota Corolla catalog branch; use here only for the issue's later 2004-2008 production and confirm build date and VIN Fitment/availability: Add to Cart liv…
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 (2)
Chevrolet Equinox · 2010–2017
Saturn Aura · 2007–2009
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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 43 vehicle models from 19 manufacturers: Acura, Chevrolet, Chrysler, Dodge, Ford, GMC, Honda, Hyundai, Infiniti, Jeep, Kia, Mazda, Nissan, Porsche, 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.