← View Generic B3945 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B3945: B3945: Climate Control Fan Motor Malfunction

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$100 - $300
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 B3945 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The climate control fan motor is malfunctioning, causing the fan to not turn on or turn off properly.
⚠️

Symptoms

  • • Fan not blowing air
  • • uneven airflow
  • • or fan making unusual noises
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Common Causes

  • • Faulty fan motor
  • • faulty fan motor resistor
  • • or wiring issue
🛠️

How to Fix B3945 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Disconnect battery to prevent electrical shock. 2. Locate the fan motor resistor and check for any signs of damage or corrosion. 3. Replace the fan motor resistor if damaged. 4. Check the wiring harness for any signs of damage or corrosion. 5. Replace the wiring harness if damaged. 6. Reconnect the battery and test the fan.

🔧

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Fan motor resistor 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 B3945

B3943 Sequential Code

B3943: Audio System Fault

Medium
B3944 Sequential Code

B3944: Airbag System Fault

High
B3946 Sequential Code

B3946: Door Locks Actuator Malfunction

Medium
B3947 Sequential Code

B3947: Power Window Relay Circuit 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