← View Generic B1861 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1861: B1861: 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 B1861 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 symptoms.
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Common Causes

  • • Faulty headlight or taillight bulb
  • • wiring issue
  • • or a problem with the lighting control module.
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How to Fix B1861 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the headlight or taillight bulb and replace it if necessary. 2. Inspect the wiring and connectors for damage or corrosion and repair or replace as needed. 3. Check the lighting control module for any faults and clear any trouble codes. 4. If the issue persists, have a professional mechanic diagnose and repair the problem.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

headlight or taillight bulb Shop ↗ wiring harness Shop ↗ lighting control module Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B1861

B1859 Sequential Code

B1859: Power Window Relay Circuit Malfunction

Medium
B1860 Sequential Code

B1860: Seat Position Sensor Circuit Malfunction

Medium
B1862 Sequential Code

B1862: Immobilizer System Malfunction

High
B1863 Sequential Code

B1863: 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