← View Generic B1870 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1870: B1870: 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 B1870 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The immobilizer system has detected a malfunction, preventing the engine from starting. This code is usually triggered by a faulty immobilizer sensor, wiring issue, or a problem with the keyless entry system.
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Symptoms

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

  • • Faulty immobilizer sensor
  • • wiring issue
  • • key fob battery drain
  • • keyless entry system malfunction
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How to Fix B1870 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check and replace the immobilizer sensor if faulty. 2. Inspect and repair any damaged wiring. 3. Replace key fob battery if low. 4. Update keyless entry system software if necessary.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

immobilizer sensor Shop ↗ wiring harness Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with B1870

B1868 Sequential Code

B1868: Seat Position Sensor Circuit Malfunction

Medium
B1869 Sequential Code

B1869: Body System Code for Lighting Malfunction

Medium
B1871 Sequential Code

B1871: Audio System Fault

Medium
B1872 Sequential Code

B1872: 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