# P0455 — EVAP Large Leak Detected

> ClearTheCode diagnostic code reference (not OEM service data).

Source: https://clearthecode.com/codes/P0455

**System:** Powertrain · EVAP

**Severity:** minor

## Description

Large EVAP leak (typically 0.080"). Check gas cap first; if cap is fine, smoke-test the EVAP system for a disconnected or cracked hose.

## Diagnostic snapshot

- **Difficulty:** 6/10 — Intermediate diagnostics
- **Est. repair cost:** $120 – $450

## Diagnostic workflow

1. Confirm P0455 with a live scan — note pending vs stored and freeze frame data.
2. Inspect wiring/connectors and related sensors before replacing modules.
3. Clear codes and road-test; re-scan after two drive cycles if the monitor must set.

## Related articles

- [EVAP System Gross Leak on Your 2020 Toyota Highlander](https://clearthecode.com/articles/evap-system-gross-leak-toyota-highlander-2020)
- [Check Engine Light: Large EVAP Leak 2017 Toyota Corolla Im](https://clearthecode.com/articles/check-engine-light-large-evap-leak-toyota-corolla-im-2017)
- [Loose Gas Cap Causes Check Engine Light 2020 Toyota Prius](https://clearthecode.com/articles/loose-gas-cap-check-engine-light-toyota-prius-2020)
- [Fuel Cap Light On Dashboard 2018 Toyota Rav4: Fixes & Causes](https://clearthecode.com/articles/fuel-cap-light-on-dashboard-toyota-rav4-2018)
- [EVAP System Gross Leak 2018 Toyota 86: Fix Fuel Smells](https://clearthecode.com/articles/evap-system-gross-leak-toyota-86-2018)
- [2017 Toyota Avalon Engine Runs Rough After Refueling Gas Tank](https://clearthecode.com/articles/engine-rough-idle-after-gas-fillup-toyota-avalon-2017)
- [Check Engine Light P0455 Large EVAP Leak 2016 Toyota Sienna](https://clearthecode.com/articles/check-engine-light-p0455-large-leak-toyota-sienna-2016)
- [Diagnosing a Large EVAP System Leak DIY 2016 Toyota Scion Im](https://clearthecode.com/articles/diagnosing-large-evap-system-leak-diy-toyota-scion-im-2016)
- [Check Engine Light for Large EVAP Leak 2016 Toyota Mirai](https://clearthecode.com/articles/evap-system-gross-leak-diagnosis-toyota-mirai-2016)
- [2020 Toyota 86 EVAP System Gross Leak: Diagnosis & Fixes](https://clearthecode.com/articles/evap-system-gross-leak-toyota-86-2020)
- [2017 Toyota Highlander Engine Runs Rough After Refueling Gas Tank](https://clearthecode.com/articles/engine-rough-idle-after-gas-fillup-toyota-highlander-2017)
- [Check Engine Light for Large EVAP Leak 2016 Toyota Yaris](https://clearthecode.com/articles/check-engine-light-large-evap-leak-toyota-yaris-2016)
- [Check Engine Light P0455 Large EVAP Leak 2017 Toyota Camry](https://clearthecode.com/articles/check-engine-light-p0455-large-leak-toyota-camry-2017)
- [2020 4Runner EVAP Vacuum Hose Cracked: Check Engine Light Fix](https://clearthecode.com/articles/evap-vacuum-hose-cracked-check-engine-toyota-4runner-2020)
- [Check Engine Light: Large EVAP Leak on 2016 Toyota Prius](https://clearthecode.com/articles/check-engine-light-large-evap-leak-toyota-prius-2016)
- [2017 Toyota Fchv-Adv EVAP Vacuum Hose Cracked: Check Engine Light](https://clearthecode.com/articles/evap-vacuum-hose-cracked-check-engine-toyota-fchv-adv-2017)
- [Check Engine Light: Large EVAP Leak on 2017 Toyota Mirai](https://clearthecode.com/articles/check-engine-light-large-evap-leak-toyota-mirai-2017)
- [Check Engine Light P0455 Large EVAP Leak 2017 Toyota Mirai](https://clearthecode.com/articles/check-engine-light-p0455-large-leak-toyota-mirai-2017)
- [Loose Gas Cap Causes Check Engine Light 2019 Toyota Prius](https://clearthecode.com/articles/loose-gas-cap-check-engine-light-toyota-prius-2019)
- [Loose Gas Cap Causes Check Engine Light 2019 Toyota Land Cruiser](https://clearthecode.com/articles/loose-gas-cap-check-engine-light-toyota-land-cruiser-2019)
- [Troubleshooting Gross EVAP Leak Code P0455 2001 Toyota Camry](https://clearthecode.com/articles/gross-evap-leak-code-p0455-toyota-camry-2001)
- [Engine Stalls Immediately After Refueling: 1997 Toyota Previa Fix](https://clearthecode.com/articles/engine-stalls-after-refueling-3826-toyota-previa-1997)
- [1997 Ford A9513 EVAP Line Rusted or Broken: Gas Leak Repair](https://clearthecode.com/articles/evap-line-rusted-broken-leak-ford-a9513-1997)
- [Loose Gas Cap Causes Check Engine Light 2002 Toyota Tundra](https://clearthecode.com/articles/loose-gas-cap-check-engine-light-toyota-tundra-2002)
- [Engine Runs Rough After Refueling Gas Tank 1996 Ford Lnt9000](https://clearthecode.com/articles/engine-rough-idle-after-gas-fillup-ford-lnt9000-1996)
- [Check Engine Light for Large EVAP Leak 1998 Toyota Camry](https://clearthecode.com/articles/evap-system-gross-leak-diagnosis-toyota-camry-1998)
- [Check Engine Light P0455 Large EVAP Leak 1996 Toyota Land Cruiser](https://clearthecode.com/articles/check-engine-light-p0455-large-evap-leak-toyota-land-cruiser-1996)
- [Loose Gas Cap Causes Check Engine Light 1997 Ford Contour](https://clearthecode.com/articles/loose-gas-cap-check-engine-light-ford-contour-1997)
- [Check Engine Light On After Filling Gas Tank 2000 Toyota 4Runner](https://clearthecode.com/articles/engine-light-on-after-gas-fill-toyota-4runner-2000)
- [Check Engine Light for Large EVAP Leak 1998 Toyota Land Cruiser](https://clearthecode.com/articles/check-engine-light-large-evap-leak-9712-toyota-land-cruiser-1998)
- [Gross EVAP Leak Symptoms 1996 Ford Lt9000](https://clearthecode.com/articles/gross-evap-leak-symptoms-ford-lt9000-1996)
- [Check Engine Light P0455 Large EVAP Leak Detected 1996 Ford E-350](https://clearthecode.com/articles/check-engine-light-p0455-large-evap-leak-ford-e-350-1996)
- [2001 Toyota Avalon EVAP Line Rusted or Broken Causing Gas Leak](https://clearthecode.com/articles/evap-line-rusted-broken-leak-toyota-avalon-2001)
- [Troubleshooting Gross EVAP Leak Code P0455 2001 Toyota Corolla](https://clearthecode.com/articles/gross-evap-leak-code-p0455-toyota-corolla-2001)
- [Gross EVAP Leak Symptoms 1997 Toyota Supra](https://clearthecode.com/articles/gross-evap-leak-symptoms-toyota-supra-1997)
- [P0455 1996 Ford Taurus: EVAP Large Leak Diagnosis & Fix](https://clearthecode.com/articles/p0455-ford-taurus-1996-diagnostic-guide)