← View Generic B1742 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1742: B1742: 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 B1742 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

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

Symptoms

  • • Vehicle won't start
  • • dashboard warning light is illuminated
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Common Causes

  • • Faulty immobilizer module
  • • key fob
  • • wiring issue
  • • or low battery voltage
🛠️

How to Fix B1742 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the immobilizer module for any signs of physical damage or corrosion. Replace if necessary. 2. Try replacing the key fob battery. 3. Check the wiring harness for any signs of damage or corrosion. Repair or replace as needed. 4. If none of the above steps resolve the issue, the immobilizer module may need to be replaced.

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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 B1742

B1740 Sequential Code

B1740: Seat Position Sensor Circuit Malfunction

Medium
B1741 Sequential Code

B1741: Body System Code - Lighting Malfunction

Medium
B1743 Sequential Code

B1743: Audio System Fault

Medium
B1744 Sequential Code

B1744: 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