← View Generic P0390 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

P0390: P0390: Ignition System Misfire

on 2021 Honda PASSPORT

Fix Cost

$100 - $500

Parts & Labor

Difficulty

3/5

1-2 hours

DIY Possible?

✅ Yes

Save money

Your Vehicle

2021 Honda

PASSPORT

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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 P0390 Mean on 2021 Honda PASSPORT?

A misfire detected in one or more cylinders, which can cause decreased engine performance, rough idling, and decreased fuel efficiency.

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Symptoms

• Rough idling
• decreased engine performance
• decreased fuel efficiency
• engine light on

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Common Causes

• Faulty spark plugs
• ignition coil
• spark plug wires
• fuel injector
• or cylinder head

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How to Fix P0390 on 2021 Honda PASSPORT

1. Check and replace spark plugs if necessary. 2. Inspect and replace ignition coil if necessary. 3. Inspect and replace spark plug wires if necessary. 4. Check and clean fuel injector if necessary. 5. Inspect and replace cylinder head if necessary.

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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

spark plugs Shop ↗ ignition coil Shop ↗ spark plug wires Shop ↗ fuel injector Shop ↗ cylinder head Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 2021 Honda PASSPORT

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Related Diagnostic Codes

Other codes that may appear with P0390

P0388 Sequential Code

💡 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