← View Generic B3518 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B3518: B3518: 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
⚠️

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 B3518 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The body system security module has detected an abnormal condition, such as tampering or unauthorized access, and has set a trouble code.
⚠️

Symptoms

  • • Alarm system activation
  • • immobilizer system malfunction
  • • or dashboard warning lights
🔍

Common Causes

  • • Tampering with the vehicle's security system
  • • faulty security module
  • • or wiring issues
🛠️

How to Fix B3518 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check for any signs of tampering or unauthorized access. 2. Inspect the security module and wiring for damage or corrosion. 3. Clear the trouble code and test the security system. 4. Replace the security module if faulty.

🔧

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Security module Shop ↗ Wiring harness Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B3518

B3516 Sequential Code

B3516: Seat Position Sensor Circuit Malfunction

Medium
B3517 Sequential Code

B3517: Exterior Lighting Malfunction

Medium
B3519 Sequential Code

B3519: Audio System Malfunction

Medium
B3520 Sequential Code

B3520: Airbag System 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