← View Generic B1661 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1661: B1661: Body Control Module (BCM) Malfunction - Lighting

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 B1661 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

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

Symptoms

  • • Dim or inoperative exterior lights
  • • faulty turn signal indicators
  • • or intermittent lighting issues.
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Common Causes

  • • Faulty BCM
  • • wiring issues
  • • blown fuses
  • • or faulty lighting components.
🛠️

How to Fix B1661 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the BCM for any fault codes and clear them. 2. Inspect and repair any damaged wiring or connectors. 3. Replace any blown fuses. 4. Test the lighting components to identify any faulty ones and replace them.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

BCM Shop ↗ wiring harness Shop ↗ fuses Shop ↗ lighting components Shop ↗

Essential Tool

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Related Diagnostic Codes

Other codes that may appear with B1661

B1659 Sequential Code

B1659: Power Window Regulator Malfunction

Medium
B1660 Sequential Code

B1660: Seat Position Sensor Circuit Malfunction

Medium
B1662 Sequential Code

B1662: Body System Security Malfunction

Medium
B1663 Sequential Code

B1663: 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