← View Generic B3918 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B3918: B3918: Body System Security Malfunction

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost

$100 - $500

Parts & Labor

Difficulty

3/5

1-2 hours

DIY Possible?

❌ No

Pro recommended

Your Vehicle

2020 Chevrolet

SILVERADO 1500 PICKUP

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Important for 2020 Chevrolet SILVERADO 1500 PICKUP Owners

Before starting repairs, verify which engine your 2020 Chevrolet SILVERADO 1500 PICKUP has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does B3918 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The body control module (BCM) has detected a security-related issue, such as a tamper attempt or a malfunction in the security system.

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Symptoms

• Alarm sounds
• doors lock/unlock randomly
• security light flashes

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Common Causes

• Faulty BCM
• faulty security sensor
• tamper attempt
• wiring issue

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How to Fix B3918 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check BCM for faults and clear any trouble codes. 2. Inspect and clean security sensors. 3. Check wiring for damage or corrosion. 4. Replace BCM or security sensor if faulty.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Body Control Module Shop ↗ Security Sensor Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 2020 Chevrolet SILVERADO 1500 PICKUP

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Related Diagnostic Codes

Other codes that may appear with B3918

B3916 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