← View Generic B1166 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

B1166: B1166: Body Control Module (BCM) Security 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 B1166 Mean on 2021 Honda PASSPORT?

The Body Control Module (BCM) has detected a security system malfunction, likely due to a faulty sensor, wiring issue, or software problem.

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Symptoms

• Keyless entry system failure
• alarm system malfunction
• or immobilizer system failure

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Common Causes

• Faulty BCM sensor
• wiring issue between BCM and sensor
• software glitch
• or faulty immobilizer system

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How to Fix B1166 on 2021 Honda PASSPORT

Check BCM sensor connections and wiring for damage or corrosion Clear any stored trouble codes and perform a system reset Update BCM software if necessary Replace faulty BCM sensor or immobilizer system if necessary

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Need Maintenance Info for Your PASSPORT?

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Parts for 2021 Honda PASSPORT

BCM sensor Shop ↗ wiring harness Shop ↗ immobilizer system 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 B1166

B1164 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