← View Generic P0499 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

P0499: Evaporative Emission Control System Vent Valve Control Circuit High

on 2021 Honda PASSPORT

Fix Cost
$50 - $350
Parts & Labor
Difficulty
3/5
1-3 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 P0499 Mean on 2021 Honda PASSPORT?

The EVAP vent valve control circuit has high voltage preventing proper valve operation.
⚠️

Symptoms

  • • Check engine light
  • • EVAP vent valve may not open properly
  • • fuel tank pressure problems.
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Common Causes

  • • Wiring short to power in vent valve circuit
  • • faulty vent valve
  • • poor connections
  • • ECM driver circuit problem.
🛠️

How to Fix P0499 on 2021 Honda PASSPORT

Repair wiring short to power, replace vent valve, clean connections, test ECM vent valve driver.

🔧

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

EGR Valve Shop ↗ EVAP Canister Shop ↗ Purge Valve Shop ↗ Vacuum Lines Shop ↗

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OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with P0499

P0497 Sequential Code

P0497: Emissions Control System Not Operating Within Normal Parameters

Medium
P0498 Sequential Code

Evaporative Emission Control System Vent Valve Control Circuit Low

Medium
P0500 Sequential Code

Vehicle Speed Sensor Malfunction

Medium
P0501 Sequential Code

P0501: Idle Air Control (IAC) Valve 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