← View Generic B1406 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1406: B1406: Immobilizer System Malfunction

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$50 - $200
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 B1406 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The immobilizer system has detected a malfunction, preventing the engine from starting. This code is typically set when the immobilizer system is not functioning correctly, preventing the engine from starting.
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Symptoms

  • • Engine won't start
  • • immobilizer light on dashboard
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Common Causes

  • • Faulty immobilizer sensor
  • • faulty immobilizer module
  • • incorrect key or fob battery
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How to Fix B1406 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the immobilizer sensor and module for any signs of damage or corrosion. Clean or replace as necessary. 2. Check the key or fob battery and replace if necessary. 3. If the issue persists, reprogram the immobilizer system using a scan tool.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

immobilizer sensor Shop ↗ immobilizer module 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 B1406

B1404 Sequential Code

B1404: Seat Switch Circuit Malfunction

Medium
B1405 Sequential Code

B1405: Exterior Lighting Malfunction

Medium
B1407 Sequential Code

B1407: Audio System Malfunction

Medium
B1408 Sequential Code

B1408: Airbag System Fault

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