← View Generic B1238 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1238: B1238: 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 B1238 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The immobilizer system has detected a malfunction, preventing the engine from starting. This code is typically set when the immobilizer system is not functioning correctly, preventing the vehicle from starting.
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Symptoms

  • • Engine won't start
  • • immobilizer light on dashboard
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Common Causes

  • • Faulty immobilizer module
  • • faulty key fob
  • • low battery in key fob
  • • incorrect key fob programming
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How to Fix B1238 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the key fob battery level and replace if necessary. 2. Check the key fob programming and reprogram if necessary. 3. Check the immobilizer module for any signs of physical damage or corrosion. 4. Replace the immobilizer module if necessary.

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Need Maintenance Info for Your SILVERADO 1500 PICKUP?

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View 2020 Chevrolet SILVERADO 1500 PICKUP Specs

Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

immobilizer module Shop ↗ key fob Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B1238

B1236 Sequential Code

B1236: Seat Switch Circuit Malfunction

Medium
B1237 Sequential Code

B1237: Low Beam Headlight Relay Circuit Malfunction

Medium
B1239 Sequential Code

B1239: Audio System Fault

Medium
B1240 Sequential Code

B1240: Airbag System Malfunction

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