← View Generic B0494 Guide Severity: High
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B0494: B0494: 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 B0494 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The immobilizer system has detected a malfunction, which prevents the vehicle from starting. This code indicates a problem with the immobilizer system, which is designed to prevent theft by disabling the engine unless the correct key is present.
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Symptoms

  • • Vehicle will not start
  • • may have a flashing immobilizer light on the dashboard
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Common Causes

  • • Faulty immobilizer key
  • • bad battery
  • • faulty immobilizer module
  • • wiring issues
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How to Fix B0494 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the battery voltage and charge it if necessary. 2. Try a different key if the problem persists. 3. Check the immobilizer module and wiring for damage or corrosion. 4. Replace the immobilizer module if necessary.

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Need Maintenance Info for Your SILVERADO 1500 PICKUP?

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

immobilizer module Shop ↗ wiring harness Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B0494

B0492 Sequential Code

B0492: Seat Position Sensor Circuit Malfunction

Medium
B0493 Sequential Code

B0493: Body System Code - Lighting Functionality

Medium
B0495 Sequential Code

B0495: Audio System Fault

Medium
B0496 Sequential Code

B0496: Airbag System - Deployment Sensor Circuit Malfunction

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