← View Generic B0742 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

B0742: B0742: Immobilizer System Malfunction

on 2021 Honda PASSPORT

Fix Cost
$50 - $200
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 B0742 Mean on 2021 Honda PASSPORT?

The immobilizer system, which prevents the engine from starting without the correct key, has malfunctioned. This code indicates a problem with the immobilizer system's communication with the engine control module.
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Symptoms

  • • Engine won't start
  • • key fob not recognized
  • • alarm system malfunction
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Common Causes

  • • Faulty immobilizer key fob
  • • damaged or corroded wiring
  • • faulty immobilizer module
  • • incorrect key or keyless entry system
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How to Fix B0742 on 2021 Honda PASSPORT

1. Check the key fob's battery level and replace it if necessary. 2. Inspect the wiring and connectors for damage or corrosion and repair or replace as needed. 3. Test the immobilizer module and replace it if faulty. 4. Try using a spare key or keyless entry system if available.

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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 key fob Shop ↗ wiring harness Shop ↗ immobilizer module 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 B0742

B0740 Sequential Code

B0740: Seat Height Sensor Circuit Malfunction

Medium
B0741 Sequential Code

B0741: Turn Signal/Hazard Warning Lamp Malfunction

Medium
B0743 Sequential Code

B0743: Audio System Malfunction

Medium
B0744 Sequential Code

B0744: 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