← View Generic B0774 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B0774: B0774: 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 B0774 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The immobilizer system is malfunctioning, preventing the engine from starting. This code is typically set when the immobilizer system detects a problem with the key fob, ignition switch, or other components.
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Symptoms

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

  • • Faulty key fob
  • • worn-out ignition switch
  • • damaged immobilizer module
  • • incorrect key fob battery
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How to Fix B0774 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check and replace the key fob battery if low. 2. Clean and inspect the ignition switch for corrosion or damage. 3. Check the immobilizer module for any signs of physical damage or corrosion. 4. If none of the above steps resolve the issue, replace the immobilizer module.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

immobilizer module Shop ↗ key fob battery Shop ↗ ignition switch Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B0774

B0772 Sequential Code

B0772: Seat Adjustment Motor Fault

Medium
B0773 Sequential Code

B0773: Exterior Lighting Malfunction

Medium
B0775 Sequential Code

B0775: Audio System Malfunction

Medium
B0776 Sequential Code

B0776: Airbag System Module (ASM) Internal 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