System Gross Leak Evaporative Emission
50 articles · 7 makes affected
What is P0455?
P0455 indicates a large leak in your vehicle's evaporative emission control system, which prevents fuel vapors from being properly captured and can cause your check engine light to illuminate. This is a medium-severity issue that affects emissions compliance and may cause drivability problems if left unaddressed. The code is typically triggered when the system detects a significant vacuum leak, often from loose or damaged components in the fuel vapor recovery system.
Common Causes
- ●Loose or damaged gas cap (most frequent initial check)
- ●Cracked or disconnected EVAP system hoses
- ●Faulty purge valve or vent valve
- ●Damaged charcoal canister or fuel tank
Symptoms You May Notice
- ●Check engine light illuminated (primary symptom)
- ●Fuel odor near the vehicle
- ●Failed emissions test
- ●Reduced fuel efficiency in some cases
How to Fix It
- ●Replace gas cap ($15-$50, easy)
- ●Inspect and replace EVAP system hoses ($50-$200, moderate)
- ●Replace purge valve or vent valve ($100-$300, moderate)
- ●Replace charcoal canister ($200-$500, difficult)
Most Effective Fixes
Based on 12 owner reports. Success rates show how often each fix resolved the issue.
Start with the highest success rate fix when diagnosing P0455. If that doesn't resolve the issue, work down the list.
Root Causesfor P0455
Based on 3 owner reports
Confirmed Causes
- 1fuel pump being weak(33% of cases)fuel-pump
Things to Check
Suggested areas to investigate based on similar cases
DIY Diagnostic Guide
DIY Diagnostic Checklist
Based on 3 owner reports
Owner Statistics
Based on 437,843 real owner discussions • 10722 confirmed solutions
About This Data
Statistics are aggregated from real owner discussions on Reddit, automotive forums, and YouTube comments. All data is anonymized and represents actual repair experiences reported by vehicle owners.
Frequently Appears With
These codes often appear together in owner reports. Check these if you see P0455.
- P04567 reports
- P03056 reports
- P03006 reports
- P03522 reports
- P04422 reports
- P03012 reports
- P00182 reports
- P01712 reports
Based on analysis of 29 owner reports where multiple codes appeared together.