← View Generic B0742 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B0742: B0742: 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 B0742 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The immobilizer system, which prevents the engine from starting without the correct key, has malfunctioned. This code indicates a problem with the immobilizer system's communication with the engine control module.
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Symptoms

  • • Engine won't start
  • • key fob not recognized
  • • alarm system malfunction
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Common Causes

  • • Faulty immobilizer key fob
  • • damaged or corroded wiring
  • • faulty immobilizer module
  • • incorrect key or keyless entry system
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How to Fix B0742 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the key fob's battery level and replace it if necessary. 2. Inspect the wiring and connectors for damage or corrosion and repair or replace as needed. 3. Test the immobilizer module and replace it if faulty. 4. Try using a spare key or keyless entry system if available.

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Need Maintenance Info for Your SILVERADO 1500 PICKUP?

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

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

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Related Diagnostic Codes

Other codes that may appear with B0742

B0740 Sequential Code

B0740: Seat Height Sensor Circuit Malfunction

Medium
B0741 Sequential Code

B0741: Turn Signal/Hazard Warning Lamp Malfunction

Medium
B0743 Sequential Code

B0743: Audio System Malfunction

Medium
B0744 Sequential Code

B0744: 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