← View Generic B2406 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B2406: B2406: 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 B2406 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The immobilizer system has detected a malfunction, preventing the engine from starting. This code is usually caused by a faulty immobilizer module, key fob, or wiring issue.
⚠️

Symptoms

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

  • • Faulty immobilizer module
  • • key fob
  • • wiring issue
  • • or battery drain
🛠️

How to Fix B2406 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the immobilizer module for any signs of physical damage or corrosion. Replace if necessary. 2. Check the key fob battery level and replace if necessary. 3. Check the wiring harness for any signs of damage or corrosion. Repair or replace if necessary. 4. Update the immobilizer system software if necessary.

🔧

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

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

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B2406

B2404 Sequential Code

B2404: Seat Position Sensor Circuit Malfunction

Medium
B2405 Sequential Code

B2405: Turn Signal Lamp Malfunction

Medium
B2407 Sequential Code

B2407: Audio System Fault

Medium
B2408 Sequential Code

B2408: 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