Fix Cost
$50 - $200
Parts & Labor
Difficulty
3/5
Moderate
1-2 hours
DIY Possible?
✅ Yes
Save money
Category
Body
System
📖 What Does B0173 Mean?
The body control module (BCM) has detected a malfunction in the exterior lighting system, such as a faulty headlight, taillight, or turn signal.
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Symptoms
- • Dim or inoperable exterior lights
- • flickering lights
- • or lights that do not turn off when the ignition is turned off.
🔍
Common Causes
- • Faulty exterior light bulb
- • wiring issue
- • or body control module malfunction.
Fix Guide
🛠️
Possible Solutions
1. Inspect and replace faulty exterior light bulbs. 2. Check and repair any damaged or corroded wiring. 3. Update the body control module software if necessary.
Required Parts
Tools
Multimeter
Torx screwdriver
👨🔧
Need a Pro?
Complex codes like B0173 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 B0173
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