← View Generic B3702 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B3702: B3702: 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 B3702 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The immobilizer system has detected a malfunction, preventing the vehicle from starting or running. This code is usually related to a faulty immobilizer module, key fob, or sensor.
⚠️

Symptoms

  • • Vehicle won't start
  • • key fob not recognized
  • • alarm system malfunction
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Common Causes

  • • Faulty immobilizer module
  • • key fob
  • • or sensor
  • • low battery voltage
  • • incorrect key fob programming
🛠️

How to Fix B3702 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check key fob battery level and replace if necessary. 2. Check for any debris or corrosion on the key fob sensor. 3. Replace the immobilizer module if faulty. 4. Re-program the key fob if necessary.

🔧

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

immobilizer module Shop ↗ key fob Shop ↗ sensor Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B3702

B3700 Sequential Code

B3700: Seat Position Sensor Malfunction

Medium
B3701 Sequential Code

B3701: Exterior Lighting Malfunction

Medium
B3703 Sequential Code

B3703: Audio System Fault

Medium
B3704 Sequential Code

B3704: 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