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B0702

B0702: Immobilizer System Malfunction

Fix Cost
$50 - $200
Parts & Labor
Difficulty
3/5
Moderate
1-2 hours
DIY Possible?
❌ No
Pro recommended
Category
Body
System

📖 What Does B0702 Mean?

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

  • • Key not recognized
  • • engine won't start
  • • dashboard warning light is illuminated
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Common Causes

  • • Faulty immobilizer key
  • • malfunctioning immobilizer system module
  • • wiring issues
  • • or incorrect key programming
Fix Guide
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Possible Solutions

1. Check the immobilizer key for any damage or wear. Replace it if necessary. 2. Check the immobilizer system module for any signs of physical damage or corrosion. Clean or replace it if necessary. 3. Check the wiring harness for any signs of damage or corrosion. Repair or replace it if necessary. 4. Re-program the immobilizer system module using a specialized tool.

❓ Common Questions About B0702

Can I drive with code B0702?

You can drive for a short time, but should address code B0702 soon to avoid worsening the problem or failing an emissions test.

How much does it cost to fix code B0702?

The estimated repair cost for code B0702 is between $50 and $200. This includes parts and labor. Prices may vary based on your vehicle's make and model.

Is code B0702 easy to fix myself?

This repair is considered moderate. It may require specialized tools or significant disassembly. If you are not an experienced mechanic, professional help is recommended.

Required Parts

Tools

immobilizer system programming tool multimeter wiring harness repair kit
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Need a Pro?

Complex codes like B0702 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 B0702

B0700 Sequential Code

B0700: Seat Position Sensor Malfunction

Medium
B0701 Sequential Code

B0701: Turn Signal Lamp Malfunction

Medium
B0703 Sequential Code

B0703: Audio System Fault

Medium
B0704 Sequential Code

B0704: Airbag System Circuit Malfunction

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