← View Generic B0173 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B0173: B0173: Exterior Light 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 B0173 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The body control module (BCM) has detected a malfunction in the exterior lighting system, such as a faulty headlight, taillight, or turn signal.
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Symptoms

  • • Dim or inoperable exterior lights
  • • flickering lights
  • • or lights that do not turn off when the ignition is turned off.
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Common Causes

  • • Faulty exterior light bulb
  • • wiring issue
  • • or body control module malfunction.
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How to Fix B0173 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Inspect and replace faulty exterior light bulbs. 2. Check and repair any damaged or corroded wiring. 3. Update the body control module software if necessary.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Exterior light bulb(s) Shop ↗ Wiring harness 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 B0173

B0171 Sequential Code

B0171: Power Window Circuit Malfunction

Medium
B0172 Sequential Code

B0172: Seat Switch Circuit Malfunction

Medium
B0174 Sequential Code

B0174: Body Control Module (BCM) Security System Malfunction

Medium
B0175 Sequential Code

B0175: 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