← View Generic B1774 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1774: B1774: Body Control Module (BCM) Security 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 B1774 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The Body Control Module (BCM) has detected a malfunction in the security system, which may cause the vehicle to be in a locked or alarm state.
⚠️

Symptoms

  • • Alarm sounds
  • • doors and trunk won't unlock
  • • vehicle won't start
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Common Causes

  • • Faulty BCM
  • • faulty security sensor
  • • faulty door lock actuator
  • • wiring issue
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How to Fix B1774 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check and clear any trouble codes. 2. Inspect and repair any damaged wiring. 3. Replace faulty security sensor or door lock actuator. 4. Update BCM software if necessary.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

BCM Shop ↗ security sensor Shop ↗ door lock actuator Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 2020 Chevrolet SILVERADO 1500 PICKUP

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🔗

Related Diagnostic Codes

Other codes that may appear with B1774

B1772 Sequential Code

B1772: Seat Position Sensor Circuit Malfunction

Medium
B1773 Sequential Code

B1773: Exterior Lighting Malfunction

Medium
B1775 Sequential Code

B1775: Audio System Fault

Medium
B1776 Sequential Code

B1776: 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