← View Generic B1606 Guide Severity: High
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1606: B1606: Immobilizer System Malfunction

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$200 - $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 B1606 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

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

Symptoms

  • • Vehicle will not start
  • • may display a 'security system malfunction' message on the dashboard
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Common Causes

  • • Faulty immobilizer system module
  • • faulty key fob
  • • low battery in key fob
  • • incorrect key fob programming
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How to Fix B1606 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the key fob battery level and replace if necessary. 2. Try reprogramming the key fob. 3. Check the immobilizer system module for any signs of physical damage or corrosion. 4. Replace the immobilizer system module if necessary.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

immobilizer system module Shop ↗ key fob Shop ↗

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OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B1606

B1604 Sequential Code

B1604: Seat Switch Circuit Malfunction

Medium
B1605 Sequential Code

B1605: Body Control Module (BCM) Lighting Circuit Malfunction

Medium
B1607 Sequential Code

B1607: Audio System Malfunction

Medium
B1608 Sequential Code

B1608: 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