← Back to Search Severity: Medium

B0102

B0102: Immobilizer System Malfunction

Fix Cost
$100 - $300
Parts & Labor
Difficulty
3/5
Moderate
1-2 hours
DIY Possible?
❌ No
Pro recommended
Category
Body
System

📖 What Does B0102 Mean?

The immobilizer system has detected a malfunction, preventing the engine from starting. This code is typically caused by a faulty immobilizer sensor, wiring issue, or incorrect keyless entry system configuration.
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Symptoms

  • • Engine won't start
  • • immobilizer warning light on dashboard
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Common Causes

  • • Faulty immobilizer sensor
  • • wiring issue
  • • incorrect keyless entry system configuration
  • • faulty key fob battery
Fix Guide
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Possible Solutions

1. Check key fob battery and replace if necessary. 2. Inspect and clean immobilizer sensor and surrounding wiring. 3. Check keyless entry system configuration and reset if necessary. 4. Replace immobilizer sensor if faulty.

Required Parts

Tools

Multimeter Wire tester
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Need a Pro?

Complex codes like B0102 can be tricky. Don't risk it if you're unsure.

Quick Stats

Severity Medium
DIY Friendly No
Est. Time 1-2 hours
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Related Diagnostic Codes

Other codes that may appear with B0102

B0100 Same System

B0100: Seat Position Sensor Malfunction

Medium
B0101 Same System

B0101: Body System Code B0101 - Lighting

Medium
B0103 Same System

B0103: Audio System Malfunction

Medium
B0104 Same System

B0104: Airbag System Malfunction

High
B0105 Same System

B0105: Climate Control Blower Motor Fault

Medium
B0106 Same System

B0106: Door Locks Malfunction

Medium

💡 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