← View Generic B0402 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B0402: B0402: Door Locks 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 B0402 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The B0402 code indicates a malfunction in the door lock system, which may cause doors to lock or unlock unexpectedly, or fail to lock/unlock at all.
⚠️

Symptoms

  • • Doors lock/unlock randomly
  • • fail to lock/unlock
  • • or make unusual noises
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Common Causes

  • • Faulty door lock actuator
  • • wiring issue
  • • door lock switch malfunction
  • • or body control module failure
🛠️

How to Fix B0402 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check door lock actuator for proper operation and replace if faulty. 2. Inspect wiring for damage or corrosion and repair/replace as needed. 3. Test door lock switch and replace if faulty. 4. Update body control module software or replace if faulty.

🔧

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Door lock actuator Shop ↗ Wiring harness Shop ↗ Door lock switch Shop ↗ Body control module Shop ↗

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Related Diagnostic Codes

Other codes that may appear with B0402

B0400 Sequential Code

B0400: Airbag System Fault

Medium
B0401 Sequential Code

B0401: Climate Control Temperature Sensor Malfunction

Medium
B0403 Sequential Code

B0403: Power Window Circuit Malfunction

Medium
B0404 Sequential Code

B0404: Seat Switch 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