Fix Cost
$50 - $200
Parts & Labor
Difficulty
3/5
Moderate
1-2 hours
DIY Possible?
✅ Yes
Save money
Category
Body
System
📖 What Does B0109 Mean?
This code indicates a problem with the exterior lighting system, such as headlights, taillights, or turn signals. The issue may be related to a faulty bulb, wiring, or a malfunctioning control module.
⚠️
Symptoms
- • Dim or non-functioning exterior lights
- • flickering lights
- • or lights that do not turn off when the ignition is turned off
🔍
Common Causes
- • Faulty or burned-out bulbs
- • damaged or corroded wiring
- • malfunctioning lighting control module
- • or a faulty fuse
Fix Guide
🛠️
Possible Solutions
1. Check and replace any blown fuses. 2. Inspect and replace any damaged or corroded wiring. 3. Check and replace any faulty or burned-out bulbs. 4. If the issue persists, scan for any trouble codes stored in the vehicle's onboard computer and consult a repair manual for further diagnosis and repair.
Required Parts
Tools
Multimeter
Wiring tester
Torx screwdriver
👨🔧
Need a Pro?
Complex codes like B0109 can be tricky. Don't risk it if you're unsure.
Quick Stats
Severity
Medium
DIY Friendly
Yes
Est. Time
1-2 hours
🔗
Related Diagnostic Codes
Other codes that may appear with B0109
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