P0455 (generic)
EVAP Large Leak Detected
System: Powertrain · EVAP
Severity: minor · Inspection: often fails
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 P0455
- Difficulty
- 6/10 — Intermediate diagnostics
- Est. repair cost
- $120 – $450 (parts + typical shop labor)
Diagnostic workflow
- Confirm P0455 with a live scan — note pending vs stored and freeze frame data.
- Inspect wiring/connectors and related sensors before replacing modules.
- Clear codes and road-test; re-scan after two drive cycles if the monitor must set.
Topics
- OBD-II and scan tools (guide)
- Powertrain DTCs (P-prefix) (system)
Related symptoms
None linked yet.
Common fixes (curated)
None linked yet.
Related articles
- EVAP System Gross Leak on Your 2020 Toyota Highlander
- Check Engine Light: Large EVAP Leak 2017 Toyota Corolla Im
- Loose Gas Cap Causes Check Engine Light 2020 Toyota Prius
- Fuel Cap Light On Dashboard 2018 Toyota Rav4: Fixes & Causes
- EVAP System Gross Leak 2018 Toyota 86: Fix Fuel Smells
- 2017 Toyota Avalon Engine Runs Rough After Refueling Gas Tank
- Check Engine Light P0455 Large EVAP Leak 2016 Toyota Sienna
- Diagnosing a Large EVAP System Leak DIY 2016 Toyota Scion Im
- Check Engine Light for Large EVAP Leak 2016 Toyota Mirai
- 2020 Toyota 86 EVAP System Gross Leak: Diagnosis & Fixes
- 2017 Toyota Highlander Engine Runs Rough After Refueling Gas Tank
- Check Engine Light for Large EVAP Leak 2016 Toyota Yaris
- Check Engine Light P0455 Large EVAP Leak 2017 Toyota Camry
- 2020 4Runner EVAP Vacuum Hose Cracked: Check Engine Light Fix
- Check Engine Light: Large EVAP Leak on 2016 Toyota Prius
- 2017 Toyota Fchv-Adv EVAP Vacuum Hose Cracked: Check Engine Light
- Check Engine Light: Large EVAP Leak on 2017 Toyota Mirai
- Check Engine Light P0455 Large EVAP Leak 2017 Toyota Mirai
- Loose Gas Cap Causes Check Engine Light 2019 Toyota Prius
- Loose Gas Cap Causes Check Engine Light 2019 Toyota Land Cruiser
- Troubleshooting Gross EVAP Leak Code P0455 2001 Toyota Camry
- Engine Stalls Immediately After Refueling: 1997 Toyota Previa Fix
- 1997 Ford A9513 EVAP Line Rusted or Broken: Gas Leak Repair
- Loose Gas Cap Causes Check Engine Light 2002 Toyota Tundra
- Engine Runs Rough After Refueling Gas Tank 1996 Ford Lnt9000
- Check Engine Light for Large EVAP Leak 1998 Toyota Camry
- Check Engine Light P0455 Large EVAP Leak 1996 Toyota Land Cruiser
- Loose Gas Cap Causes Check Engine Light 1997 Ford Contour
- Check Engine Light On After Filling Gas Tank 2000 Toyota 4Runner
- Check Engine Light for Large EVAP Leak 1998 Toyota Land Cruiser
- Gross EVAP Leak Symptoms 1996 Ford Lt9000
- Check Engine Light P0455 Large EVAP Leak Detected 1996 Ford E-350
- 2001 Toyota Avalon EVAP Line Rusted or Broken Causing Gas Leak
- Troubleshooting Gross EVAP Leak Code P0455 2001 Toyota Corolla
- Gross EVAP Leak Symptoms 1997 Toyota Supra
- P0455 1996 Ford Taurus: EVAP Large Leak Diagnosis & Fix
Diagnostic bundle (JSON)
Machine-readable graph: related codes, symptoms, fixes, topics, articles, and curated sources rows. Append &external=1 for optional YouTube / Google CSE hits when API keys are configured (see web/.env.example).