← View Generic B0878 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

B0878: B0878: 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
⚠️

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 B0878 Mean on 2021 Honda PASSPORT?

The immobilizer system, which is responsible for preventing unauthorized engine starts, has malfunctioned. This code indicates that the system is not functioning correctly, potentially causing the engine to fail to start or start intermittently.
⚠️

Symptoms

  • • Engine will not start
  • • engine starts and stalls
  • • or engine starts and runs rough
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Common Causes

  • • Faulty immobilizer module
  • • faulty key fob
  • • faulty ignition switch
  • • or wiring issues
🛠️

How to Fix B0878 on 2021 Honda PASSPORT

1. Check the immobilizer module for any signs of physical damage or corrosion. Replace if necessary. 2. Check the key fob for any signs of damage or wear. Replace if necessary. 3. Check the ignition switch for any signs of wear or corrosion. Replace if necessary. 4. Check the wiring harness for any signs of damage or corrosion. Repair or replace as necessary.

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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 module Shop ↗ key fob Shop ↗ ignition switch 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 B0878

B0876 Sequential Code

B0876: Seat Adjuster Motor Fault

Medium
B0877 Sequential Code

B0877: Exterior Lighting Malfunction

Medium
B0879 Sequential Code

B0879: Audio System Malfunction

Medium
B0880 Sequential Code

B0880: Airbag System Fault

High

💡 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