← View Generic B0749 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B0749: B0749: Body Control Module (BCM) - Exterior 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 B0749 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

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

Symptoms

  • • Dim or inoperative exterior lights
  • • faulty headlight or taillight operation
  • • or warning lights on the dashboard.
🔍

Common Causes

  • • Faulty BCM
  • • wiring issues
  • • blown fuses
  • • or damaged exterior lights.
🛠️

How to Fix B0749 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the BCM fuse and replace if blown. 2. Inspect and repair or replace wiring as needed. 3. Test and replace faulty exterior lights. 4. Update BCM software if necessary.

🔧

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

BCM fuse Shop ↗ wiring harness Shop ↗ exterior lights Shop ↗

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Related Diagnostic Codes

Other codes that may appear with B0749

B0747 Sequential Code

B0747: Power Window Regulator Malfunction

Medium
B0748 Sequential Code

B0748: Power Seat Actuator Circuit Malfunction

Medium
B0750 Sequential Code

B0750: Immobilizer System Malfunction

Medium
B0751 Sequential Code

B0751: Audio System Fault

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