← View Generic B1133 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1133: B1133: Body Control Module (BCM) - Exterior Lighting Circuit Malfunction

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 B1133 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The Body Control Module (BCM) has detected a malfunction in the exterior lighting circuit, which may be causing issues with the headlights, taillights, or other exterior lights.
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Symptoms

  • • Dim or inoperative exterior lights
  • • faulty headlight aim
  • • or warning lights on the dashboard.
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Common Causes

  • • Faulty exterior light bulbs
  • • wiring or connector issues
  • • BCM failure
  • • or a problem with the lighting circuit relay.
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How to Fix B1133 on 2020 Chevrolet SILVERADO 1500 PICKUP

Check and replace any faulty exterior light bulbs. Inspect and repair any damaged or corroded wiring or connectors. Update the BCM software if necessary. Replace the BCM if it's faulty.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Exterior light bulb(s) Shop ↗ Wiring harness Shop ↗ Connector(s) Shop ↗ BCM software update Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 2020 Chevrolet SILVERADO 1500 PICKUP

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Related Diagnostic Codes

Other codes that may appear with B1133

B1131 Sequential Code

B1131: Power Window Circuit Malfunction

Medium
B1132 Sequential Code

B1132: Seat Position Sensor Circuit Malfunction

Medium
B1134 Sequential Code

B1134: Immobilizer System Malfunction

Medium
B1135 Sequential Code

B1135: 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