← View Generic B1021 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1021: B1021: Body System Code - Lighting 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 B1021 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

This code indicates a malfunction in the vehicle's lighting system, such as a faulty headlight, taillight, or brake light.
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Symptoms

  • • Dim or inoperative headlights
  • • taillights
  • • or brake lights
  • • or a combination of these issues.
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Common Causes

  • • Faulty headlight or taillight bulb
  • • wiring issue
  • • or a problem with the body control module.
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How to Fix B1021 on 2020 Chevrolet SILVERADO 1500 PICKUP

Check the headlight or taillight bulb and replace it if necessary. Inspect the wiring and connectors for damage or corrosion and repair as needed. Update the body control module's software if necessary.

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Need Maintenance Info for Your SILVERADO 1500 PICKUP?

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

headlight or taillight bulb Shop ↗ wiring harness Shop ↗

Essential Tool

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OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B1021

B1019 Sequential Code

B1019: Power Window Circuit Malfunction

Medium
B1020 Sequential Code

B1020: Seat Adjuster Motor Malfunction

Medium
B1022 Sequential Code

B1022: Body System Security Malfunction

Medium
B1023 Sequential Code

B1023: 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