← View Generic B1149 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1149: B1149: 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 B1149 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

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

Symptoms

  • • Dim or inoperative headlights
  • • taillights
  • • or other exterior lights
  • • possible dashboard warning lights.
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Common Causes

  • • Faulty BCM
  • • wiring harness damage
  • • blown fuse
  • • or malfunctioning lighting module.
🛠️

How to Fix B1149 on 2020 Chevrolet SILVERADO 1500 PICKUP

Check the BCM for any faults or errors using a scan tool. Inspect the wiring harness for any signs of damage or wear. Replace the BCM if faulty or damaged. Check and replace any blown fuses.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Body Control Module (BCM) Shop ↗ Wiring harness Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B1149

B1147 Sequential Code

B1147: Power Window Regulator Circuit Malfunction

Medium
B1148 Sequential Code

B1148: Seat Position Sensor Circuit Malfunction

Medium
B1150 Sequential Code

B1150: Body System Security Malfunction

Medium
B1151 Sequential Code

B1151: 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