← View Generic P0440 Guide Severity: Low
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

P0440: Evaporative Emission Control System Malfunction

on 2021 Honda PASSPORT

Fix Cost
$20 - $200
Parts & Labor
Difficulty
2/5
30 mins - 2 hours
DIY Possible?
✅ Yes
Save money
Your Vehicle
2021 Honda
PASSPORT
⚠️

Important for 2021 Honda PASSPORT Owners

Before starting repairs, verify which engine your 2021 Honda PASSPORT has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does P0440 Mean on 2021 Honda PASSPORT?

General malfunction detected in the EVAP system that prevents fuel vapors from escaping to atmosphere.
⚠️

Symptoms

  • • Check engine light
  • • occasional fuel odor
  • • failed emissions test
  • • fuel smell after refueling.
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Common Causes

  • • Loose gas cap
  • • damaged EVAP hoses
  • • faulty purge valve
  • • vent valve problems
  • • charcoal canister issues.
🛠️

How to Fix P0440 on 2021 Honda PASSPORT

Tighten gas cap, inspect and replace damaged EVAP components, test purge and vent valves, replace charcoal canister.

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Need Maintenance Info for Your PASSPORT?

Get oil capacity, filter specs, and torque settings for your specific 2021 Honda PASSPORT.

View 2021 Honda PASSPORT Specs

Parts for 2021 Honda PASSPORT

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

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with P0440

P0441 Same System

P0441: Evaporative Emission Control System Malfunction

Medium
P0442 Same System

EVAP System Leak Detected Small Leak

Low
P0443 Same System

Evaporative Emission Control System Purge Control Valve Circuit Malfunction

Medium
P0446 Same System

Evaporative Emission Control System Vent Control Circuit Malfunction

Medium
P0455 Related Problem

EVAP System Leak Detected Large Leak

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