← View Generic B1566 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

B1566: B1566: Body System Security 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 B1566 Mean on 2021 Honda PASSPORT?

The body control module (BCM) has detected a security-related issue, such as a faulty door ajar switch or a malfunctioning alarm system.

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Symptoms

• Alarm system may not function
• doors may not lock/unlock properly
• or the vehicle may not start.

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Common Causes

• Faulty door ajar switch
• malfunctioning alarm system
• or a problem with the BCM's security communication protocol.

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How to Fix B1566 on 2021 Honda PASSPORT

1. Check the door ajar switches for proper operation and cleanliness. 2. Inspect the alarm system wiring and connections for damage or corrosion. 3. Update the BCM's software if necessary. 4. Replace the BCM if it's faulty.

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Need Maintenance Info for Your PASSPORT?

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

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Parts for 2021 Honda PASSPORT

Body Control Module Shop ↗ Door Ajar Switch Shop ↗ Alarm System Wiring 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 B1566

B1564 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