← View Generic B3950 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

B3950: B3950: 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 B3950 Mean on 2021 Honda PASSPORT?

The immobilizer system has detected a malfunction, preventing the engine from starting. This code is usually triggered by a faulty immobilizer sensor, wiring issue, or a problem with the keyless entry system.
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Symptoms

  • • Engine won't start
  • • immobilizer light on dashboard
  • • keyless entry system not functioning
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Common Causes

  • • Faulty immobilizer sensor
  • • wiring issue
  • • problem with keyless entry system
  • • faulty battery
  • • or low battery voltage
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How to Fix B3950 on 2021 Honda PASSPORT

1. Check and replace the immobilizer sensor if faulty. 2. Inspect and repair any wiring issues. 3. Check and reset the keyless entry system. 4. Check and replace the battery if necessary. 5. Check and adjust the battery voltage 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 sensor Shop ↗ wiring harness Shop ↗ keyless entry 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 B3950

B3948 Sequential Code

B3948: Seat Position Sensor Malfunction

Medium
B3949 Sequential Code

B3949: Exterior Lighting Malfunction

Medium
B3951 Sequential Code

B3951: Audio System Fault

Medium
B3952 Sequential Code

B3952: 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