← View Generic B3118 Guide Severity: High
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B3118: B3118: Immobilizer System 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 B3118 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The immobilizer system has detected a malfunction, preventing the vehicle from starting or running. This code is typically set when the immobilizer system is not functioning correctly, preventing the vehicle from being started.
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Symptoms

  • • Vehicle will not start
  • • may have a flashing immobilizer light on the dashboard
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Common Causes

  • • Faulty immobilizer module
  • • faulty key fob battery
  • • incorrect key fob programming
  • • faulty wiring or connectors
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How to Fix B3118 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the key fob battery and replace if necessary. 2. Check the immobilizer module for any signs of physical damage or corrosion. 3. Check the wiring and connectors for any signs of damage or corrosion. 4. If the issue persists, reprogram the key fob using a professional scan tool.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

immobilizer module Shop ↗ key fob battery Shop ↗ wiring harness Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B3118

B3116 Sequential Code

B3116: Seat Switch Circuit Malfunction

Medium
B3117 Sequential Code

B3117: Turn Signal Lamp Malfunction

Medium
B3119 Sequential Code

B3119: Audio System Malfunction

Medium
B3120 Sequential Code

B3120: 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