← Back to Search Severity: Medium

B0149

B0149: Body Control Module (BCM) Lighting Circuit Malfunction

Fix Cost
$100 - $500
Parts & Labor
Difficulty
3/5
Moderate
1-2 hours
DIY Possible?
❌ No
Pro recommended
Category
Body
System

📖 What Does B0149 Mean?

The Body Control Module (BCM) has detected a malfunction in the lighting circuit, which may cause issues with the vehicle's exterior lights, such as the headlights, taillights, or turn signals.
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Symptoms

  • • Inoperable or flickering exterior lights
  • • warning lights on the dashboard
  • • or a malfunctioning lighting system.
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Common Causes

  • • Faulty BCM
  • • wiring issues
  • • blown fuses
  • • or a malfunctioning lighting module.
Fix Guide
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Possible Solutions

1. Check the BCM for any error codes and clear them if necessary. 2. Inspect the wiring and connectors for any damage or corrosion. 3. Replace any blown fuses or faulty lighting modules. 4. Update the BCM software if necessary.

Required Parts

Tools

multimeter wiring tester screwdrivers torx bits
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Need a Pro?

Complex codes like B0149 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 B0149

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