← View Generic P0455 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2018 Buick LACROSSE

P0455: EVAP System Leak Detected Large Leak

on 2018 Buick LACROSSE

Fix Cost
$20 - $200
Parts & Labor
Difficulty
2/5
30 mins - 2 hours
DIY Possible?
✅ Yes
Save money
Your Vehicle
2018 Buick
LACROSSE
⚠️

Important for 2018 Buick LACROSSE Owners

Before starting repairs, verify which engine your 2018 Buick LACROSSE has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does P0455 Mean on 2018 Buick LACROSSE?

A large leak has been detected in the evaporative emission control system, allowing significant amounts of fuel vapor to escape.
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Symptoms

  • • Check engine light
  • • strong fuel odor especially when refueling
  • • failed emissions test
  • • fuel smell inside vehicle.
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Common Causes

  • • Missing or severely damaged gas cap
  • • major EVAP hose damage
  • • faulty purge or vent valve
  • • damaged fuel tank
  • • loose fuel filler neck.
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How to Fix P0455 on 2018 Buick LACROSSE

Replace gas cap, repair or replace damaged EVAP hoses, replace faulty valves, inspect fuel tank for damage, tighten fuel system connections.

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Need Maintenance Info for Your LACROSSE?

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Parts for 2018 Buick LACROSSE

Gas Cap Shop ↗ EVAP Purge Valve Shop ↗ EVAP Canister Shop ↗ Vacuum Hoses Shop ↗

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Related Diagnostic Codes

Other codes that may appear with P0455

P0440 Related Problem

Evaporative Emission Control System Malfunction

Low
P0441 Related Problem

P0441: Evaporative Emission Control System Malfunction

Medium
P0442 Related Problem

EVAP System Leak Detected Small Leak

Low
P0443 Related Problem

Evaporative Emission Control System Purge Control Valve Circuit Malfunction

Medium
P0446 Related Problem

Evaporative Emission Control System Vent Control Circuit Malfunction

Medium

💡 Why These Codes Are Related:

  • • Similar Issues: Same root cause or component failure
  • • Related Problems: Often occur together due to system interactions
  • • Sequential Codes: Progressive failure stages or multiple sensors
  • • Same System: Components within the same automotive system