← View Generic B1866 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1866: B1866: Door Locks Actuator Malfunction

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$50 - $150
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 B1866 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The door locks actuator is malfunctioning, preventing the doors from locking or unlocking properly.
⚠️

Symptoms

  • • Doors won't lock or unlock
  • • may be stuck in a locked or unlocked position
  • • or may not respond to the door lock switch.
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Common Causes

  • • Faulty door locks actuator
  • • wiring issue
  • • or a problem with the door lock switch.
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How to Fix B1866 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the door lock switch for any signs of wear or damage. Clean or replace it if necessary. 2. Inspect the wiring harness for any signs of damage or corrosion. Repair or replace it if necessary. 3. Test the door locks actuator by using a multimeter to check for power and ground. Replace it if necessary.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Door locks actuator Shop ↗ Wiring harness Shop ↗ Door lock switch Shop ↗

Essential Tool

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Related Diagnostic Codes

Other codes that may appear with B1866

B1864 Sequential Code

B1864: Airbag System Fault

High
B1865 Sequential Code

B1865: Climate Control Fan Motor Malfunction

Medium
B1867 Sequential Code

B1867: Power Window Relay Circuit Malfunction

Medium
B1868 Sequential Code

B1868: Seat Position Sensor 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