← View Generic B1990 Guide Severity: High

🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

B1990: B1990: 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 B1990 Mean on 2021 Honda PASSPORT?

The Body Control Module (BCM) has detected a security system malfunction, which can prevent the vehicle from starting or running.

⚠️

Symptoms

• Vehicle won't start
• alarm sounds continuously
• or security light on dashboard

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Common Causes

• Faulty BCM
• faulty security sensor
• or wiring issue

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How to Fix B1990 on 2021 Honda PASSPORT

1. Check BCM fuse and replace if blown. 2. Check security sensor connections and clean or replace if necessary. 3. Check wiring for damage or corrosion and repair if necessary. 4. Update BCM software if necessary.

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Parts for 2021 Honda PASSPORT

BCM fuse Shop ↗ security sensor Shop ↗ wiring harness Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B1990

B1988 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