← Back to Search Severity: Medium

B0198

B0198: Immobilizer System Malfunction

Fix Cost
$100 - $500
Parts & Labor
Difficulty
3/5
Moderate
1-2 hours
DIY Possible?
❌ No
Pro recommended
Category
Body
System

📖 What Does B0198 Mean?

The immobilizer system has detected a malfunction, preventing the engine from starting. This code indicates a problem with the immobilizer system, which is designed to prevent theft by disabling the engine unless the correct key is present.
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Symptoms

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

  • • Faulty immobilizer module
  • • incorrect or worn-out key
  • • faulty keyless entry system
  • • wiring issues
Fix Guide
🛠️

Possible Solutions

1. Check the immobilizer module for any signs of physical damage or corrosion. Clean or replace if necessary. 2. Check the keyless entry system for any issues. 3. Try using a spare key or reprogramming the keyless entry system. 4. If the issue persists, replace the immobilizer module.

Required Parts

Tools

multimeter wire tester
👨‍🔧

Need a Pro?

Complex codes like B0198 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 B0198

B0100 Same System

B0100: Seat Position Sensor Malfunction

Medium
B0101 Same System

B0101: Body System Code B0101 - Lighting

Medium
B0102 Same System

B0102: Immobilizer System Malfunction

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

💡 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