← Back to Search Severity: Medium

B0174

B0174: Body Control Module (BCM) Security System Malfunction

Fix Cost
$200 - $500
Parts & Labor
Difficulty
3/5
Moderate
1-2 hours
DIY Possible?
❌ No
Pro recommended
Category
Body
System

📖 What Does B0174 Mean?

The Body Control Module (BCM) has detected a security system malfunction, which may cause the vehicle to enter a fail-safe mode or prevent certain features from functioning.
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Symptoms

  • • Engine light on
  • • security system alarm sounds
  • • doors and trunk may be locked or unlocked randomly
  • • some features may be disabled
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Common Causes

  • • Faulty BCM
  • • damaged or corroded wiring
  • • malfunctioning security sensors
  • • incorrect BCM programming
Fix Guide
🛠️

Possible Solutions

1. Check for loose or corroded wiring and clean or replace as needed. 2. Check BCM programming and update if necessary. 3. Replace faulty security sensors. 4. Re-program the BCM if necessary.

Required Parts

Tools

multimeter wiring tester diagnostic scanner
👨‍🔧

Need a Pro?

Complex codes like B0174 can be tricky. Don't risk it if you're unsure.

Quick Stats

Severity Medium
DIY Friendly No
Est. Time 1-2 hours
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Related Diagnostic Codes

Other codes that may appear with B0174

B0100 Same System

B0100: Seat Position Sensor Malfunction

Medium
B0101 Same System

B0101: Body System Code B0101 - Lighting

Medium
B0102 Same System

B0102: Immobilizer System Malfunction

Medium
B0103 Same System

B0103: Audio System Malfunction

Medium
B0104 Same System

B0104: Airbag System Malfunction

High
B0105 Same System

B0105: Climate Control Blower Motor 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