← View Generic B1605 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1605: B1605: Body Control Module (BCM) Lighting Circuit 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 B1605 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The Body Control Module (BCM) has detected a malfunction in the lighting circuit, which may be causing issues with the vehicle's exterior lights, such as the headlights, taillights, or turn signals.
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Symptoms

  • • Malfunctioning exterior lights
  • • flickering lights
  • • or lights that do not turn off when the ignition is turned off
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Common Causes

  • • Faulty BCM
  • • wiring issues
  • • blown fuse
  • • or a malfunctioning lighting component
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How to Fix B1605 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the BCM for any fault codes and clear them. 2. Inspect the wiring and connectors for any damage or corrosion. 3. Replace the BCM if it is faulty. 4. Check the fuses and replace any blown ones. 5. Replace any malfunctioning lighting components.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Body Control Module Shop ↗ Wiring harness Shop ↗ Fuses Shop ↗ Lighting components Shop ↗

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Related Diagnostic Codes

Other codes that may appear with B1605

B1603 Sequential Code

B1603: Power Window Circuit Malfunction

Medium
B1604 Sequential Code

B1604: Seat Switch Circuit Malfunction

Medium
B1606 Sequential Code

B1606: Immobilizer System Malfunction

High
B1607 Sequential Code

B1607: Audio System Malfunction

Medium

💡 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