← Back to Search Severity: Medium

B0478

B0478: Body System Security Malfunction

Fix Cost

$100 - $500

Parts & Labor

Difficulty

3/5

Moderate

1-2 hours

DIY Possible?

❌ No

Pro recommended

📖 What Does B0478 Mean?

This code indicates a malfunction in the vehicle's security system, which may cause issues with door locks, alarm, or immobilizer functions.

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Symptoms

• Door locks not functioning
• alarm not triggering
• or vehicle will not start

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Common Causes

• Faulty security module
• wiring harness damage
• or incorrect security system settings

Fix Guide

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Possible Solutions

1. Check security system settings and reset if necessary. 2. Inspect wiring harness for damage and repair or replace as needed. 3. Replace faulty security module if found.

❓ Common Questions About B0478

Can I drive with code B0478?

You can drive for a short time, but should address code B0478 soon to avoid worsening the problem or failing an emissions test.

How much does it cost to fix code B0478?

The estimated repair cost for code B0478 is between $100 and $500. This includes parts and labor. Prices may vary based on your vehicle's make and model.

Is code B0478 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

Multimeter Wire tester

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Need a Pro?

Complex codes like B0478 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 B0478

B0476 Sequential Code

💡 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