← View Generic B3390 Guide Severity: High
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B3390: B3390: Immobilizer System Malfunction

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$50 - $200
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 B3390 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The immobilizer system has detected a malfunction, preventing the vehicle 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

  • • Vehicle will not start
  • • may display a warning light on the dashboard
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Common Causes

  • • Faulty immobilizer system
  • • faulty key fob
  • • low battery in key fob
  • • incorrect key fob programming
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How to Fix B3390 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check the key fob battery level and replace if necessary. 2. Check the key fob for any damage or corrosion. 3. Check the immobilizer system wiring and connections for any damage or corrosion. 4. If the issue persists, reprogram the key fob using a professional scan tool.

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Need Maintenance Info for Your SILVERADO 1500 PICKUP?

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

immobilizer system module Shop ↗ key fob Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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🔗

Related Diagnostic Codes

Other codes that may appear with B3390

B3388 Sequential Code

B3388: Seat Switch Circuit Malfunction

Medium
B3389 Sequential Code

B3389: Exterior Lighting Malfunction

Medium
B3391 Sequential Code

B3391: Audio System Fault

Medium
B3392 Sequential Code

B3392: Airbag System Fault

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