← View Generic B0391 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

B0391: B0391: Audio System Malfunction

on 2021 Honda PASSPORT

Fix Cost

$100 - $500

Parts & Labor

Difficulty

3/5

1-2 hours

DIY Possible?

❌ No

Pro recommended

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 B0391 Mean on 2021 Honda PASSPORT?

The B0391 code indicates a malfunction in the audio system, possibly due to a faulty amplifier, speaker, or wiring issue.

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Symptoms

• No sound or distorted sound from the speakers
• inability to adjust volume or settings
• or intermittent audio system failure.

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Common Causes

• Faulty audio amplifier
• blown or damaged speakers
• corroded or damaged wiring
• or a malfunctioning audio control module.

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How to Fix B0391 on 2021 Honda PASSPORT

1. Check and repair or replace damaged wiring. 2. Inspect and replace faulty speakers. 3. Test and replace the audio amplifier if necessary. 4. Update or replace the audio control module if faulty.

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Need Maintenance Info for Your PASSPORT?

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Parts for 2021 Honda PASSPORT

Audio amplifier Shop ↗ Speakers Shop ↗ Wiring harness 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 B0391

B0389 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