← Back to Search Severity: Medium

B0070

B0070: Body Control Module (BCM) Security System Malfunction

Fix Cost
$200 - $800
Parts & Labor
Difficulty
3/5
Moderate
1-2 hours
DIY Possible?
❌ No
Pro recommended
Category
Body
System

📖 What Does B0070 Mean?

The Body Control Module (BCM) has detected a security system malfunction, which may be caused by a faulty BCM, a problem with the security system wiring, or a malfunctioning security system component.
⚠️

Symptoms

  • • Car won't start
  • • alarm sounds randomly
  • • security lights flash on and off
  • • or the car's computer displays a security-related error message.
🔍

Common Causes

  • • Faulty BCM
  • • security system wiring issues
  • • malfunctioning security system component
  • • or a problem with the car's key fob.
Fix Guide
🛠️

Possible Solutions

1. Check the security system wiring for any damage or corrosion and repair or replace as needed. 2. Update the BCM software if necessary. 3. Replace the faulty BCM or security system component.

Required Parts

Tools

multimeter wiring tester soldering iron
👨‍🔧

Need a Pro?

Complex codes like B0070 can be tricky. Don't risk it if you're unsure.

Quick Stats

Severity Medium
DIY Friendly No
Est. Time 1-2 hours
🔗

Related Diagnostic Codes

Other codes that may appear with B0070

B0000 Same System

Airbag System Malfunction (B0000)

High
B0001 Same System

Body System Code B0001: Climate Control Malfunction

Medium
B0002 Same System

Body System Code B0002: Door Locks Malfunction

Medium
B0003 Same System

Body System Code B0003: Windows

Medium
B0004 Same System

Seat Position Sensor Malfunction

Medium
B0005 Same System

Body System Code B0005: Lighting Malfunction

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