← View Generic B1973 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1973: B1973: Body Control Module (BCM) Malfunction - Exterior Lighting

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$100 - $500
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
❌ No
Pro recommended
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 B1973 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The Body Control Module (BCM) has detected a malfunction in the exterior lighting system, which may cause issues with turn signals, brake lights, or other exterior lights.
⚠️

Symptoms

  • • Inoperative or flickering exterior lights
  • • turn signal lights not functioning
  • • brake lights not illuminating
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Common Causes

  • • Faulty BCM
  • • wiring issues
  • • blown fuse
  • • faulty exterior light module
🛠️

How to Fix B1973 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check and replace blown fuses. 2. Inspect and repair wiring issues. 3. Replace faulty BCM or exterior light module.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

BCM Shop ↗ exterior light module Shop ↗ fuses Shop ↗

Essential Tool

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Related Diagnostic Codes

Other codes that may appear with B1973

B1971 Sequential Code

B1971: Power Window Circuit Malfunction

Medium
B1972 Sequential Code

B1972: Seat Position Sensor Circuit Malfunction

Medium
B1974 Sequential Code

B1974: Immobilizer System Malfunction

High
B1975 Sequential Code

B1975: 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