← Back to Search Severity: Medium

B0390

B0390: Body Control Module (BCM) Security Fault

Fix Cost

$100 - $500

Parts & Labor

Difficulty

3/5

Moderate

1-2 hours

DIY Possible?

❌ No

Pro recommended

📖 What Does B0390 Mean?

The Body Control Module (BCM) has detected a security fault, which may be caused by a faulty sensor, wiring issue, or software problem.

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Symptoms

• Alarm system malfunction
• door locks not functioning
• or immobilizer system failure

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Common Causes

• Faulty sensor
• wiring issue
• software problem
• or BCM failure

Fix Guide

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Possible Solutions

1. Check and clear any trouble codes. 2. Inspect and repair or replace faulty sensors. 3. Check and repair or replace wiring. 4. Update software if necessary. 5. Replace BCM if faulty.

❓ Common Questions About B0390

Can I drive with code B0390?

You can drive for a short time, but should address code B0390 soon to avoid worsening the problem or failing an emissions test.

How much does it cost to fix code B0390?

The estimated repair cost for code B0390 is between $100 and $500. This includes parts and labor. Prices may vary based on your vehicle's make and model.

Is code B0390 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 Wiring tester Scan tool

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Need a Pro?

Complex codes like B0390 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 B0390

B0388 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