Fix Cost
$100 - $500
Parts & Labor
Difficulty
3/5
Moderate
1-2 hours
DIY Possible?
❌ No
Pro recommended
Category
Body
System
📖 What Does B0166 Mean?
The B0166 code indicates a security system malfunction in the vehicle's body control module. This can cause issues with door locks, alarm systems, and other security-related functions.
⚠️
Symptoms
- • Door locks not functioning
- • alarm system not triggering
- • security lights flashing
🔍
Common Causes
- • Faulty body control module
- • wiring issue
- • security system sensor malfunction
Fix Guide
🛠️
Possible Solutions
1. Check the body control module for any signs of physical damage or corrosion. Clean or replace as needed. 2. Inspect wiring harness for any signs of damage or wear. Repair or replace as needed. 3. Test security system sensors to ensure they are functioning properly. Replace if faulty.
Required Parts
Tools
Multimeter
Wire tester
Torx screwdriver
👨🔧
Need a Pro?
Complex codes like B0166 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 B0166
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