← View Generic B0870 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

B0870: B0870: 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 B0870 Mean on 2021 Honda PASSPORT?

The immobilizer system, which prevents the engine from starting unless the correct key is present, has malfunctioned. This code indicates that the system is not functioning correctly, preventing the engine from starting.

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Symptoms

• Engine won't start
• key fob not recognized
• alarm system not disarming

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Common Causes

• Faulty immobilizer module
• bad key fob battery
• incorrect key code
• wiring issue

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How to Fix B0870 on 2021 Honda PASSPORT

1. Check key fob battery and replace if necessary. 2. Check key code and reprogram if necessary. 3. Check immobilizer module for faults and replace if necessary. 4. Check wiring for damage or corrosion and repair if 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 battery Shop ↗ key code Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B0870

B0868 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