← View Generic B1125 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1125: B1125: Body Control Module (BCM) Malfunction - Lighting

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$50 - $200
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
✅ Yes
Save money
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 B1125 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The Body Control Module (BCM) has detected a malfunction in the vehicle's lighting system, such as a faulty headlight, taillight, or turn signal.
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Symptoms

  • • Dim or inoperative headlights
  • • taillights
  • • or turn signals
  • • unusual lighting patterns
  • • or warning lights on the dashboard.
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Common Causes

  • • Faulty BCM
  • • wiring issues
  • • blown fuses
  • • burnt-out bulbs
  • • or problems with the lighting switch.
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How to Fix B1125 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check and replace blown fuses. 2. Inspect and replace burnt-out bulbs. 3. Check and repair wiring issues. 4. Update or replace the BCM if faulty. 5. Check and adjust the lighting switch.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

BCM Shop ↗ fuses Shop ↗ bulbs Shop ↗ wiring harness Shop ↗

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Related Diagnostic Codes

Other codes that may appear with B1125

B1123 Sequential Code

B1123: Window Regulator Malfunction

Medium
B1124 Sequential Code

B1124: Seat Height Sensor Circuit Malfunction

Medium
B1126 Sequential Code

B1126: Body Control Module (BCM) Security System Malfunction

Medium
B1127 Sequential Code

B1127: 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