← View Generic B1878 Guide Severity: High

🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

B1878: B1878: Immobilizer 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 B1878 Mean on 2021 Honda PASSPORT?

The immobilizer system has detected a malfunction, preventing the engine from starting. This code is typically set when the immobilizer system is not functioning correctly, preventing the engine from starting.

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Symptoms

• Engine won't start
• immobilizer light on dashboard

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Common Causes

• Faulty immobilizer sensor
• incorrect key
• low battery voltage
• faulty wiring

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How to Fix B1878 on 2021 Honda PASSPORT

1. Check and replace the immobilizer sensor if faulty. 2. Check the key for any damage or wear. 3. Check the battery voltage and charge or replace if necessary. 4. Check and repair any damaged wiring.

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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

immobilizer sensor Shop ↗ key Shop ↗ battery 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 B1878

B1876 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