← View Generic B0638 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B0638: B0638: Immobilizer System Malfunction

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 B0638 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The immobilizer system has malfunctioned, preventing the vehicle from starting or running. This code is typically set when the immobilizer system detects a problem with the key fob, ignition switch, or other related components.
⚠️

Symptoms

  • • Vehicle will not start
  • • may have intermittent starting issues
  • • or may have a warning light on the dashboard.
🔍

Common Causes

  • • Faulty key fob
  • • bad ignition switch
  • • faulty immobilizer system module
  • • incorrect key code
  • • or a problem with the vehicle's battery.
🛠️

How to Fix B0638 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the key fob battery and replace it if necessary. 2. Check the ignition switch for any signs of wear or damage and replace it if necessary. 3. Check the immobilizer system module for any signs of malfunction and replace it if necessary. 4. Check the vehicle's battery and charging system to ensure it is functioning properly.

🔧

Need Maintenance Info for Your SILVERADO 1500 PICKUP?

Get oil capacity, filter specs, and torque settings for your specific 2020 Chevrolet SILVERADO 1500 PICKUP.

View 2020 Chevrolet SILVERADO 1500 PICKUP Specs

Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Key fob battery Shop ↗ Ignition switch Shop ↗ Immobilizer system module Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 2020 Chevrolet SILVERADO 1500 PICKUP

Shop Scanners ↗
🔗

Related Diagnostic Codes

Other codes that may appear with B0638

B0636 Sequential Code

B0636: Seat Switch Circuit Malfunction

Medium
B0637 Sequential Code

B0637: Exterior Lighting Malfunction

Medium
B0639 Sequential Code

B0639: Audio System Malfunction

Medium
B0640 Sequential Code

B0640: Airbag System Fault

High

💡 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