Fix Cost
$200 - $500
Parts & Labor
Difficulty
4/5
Hard
1-2 hours
DIY Possible?
❌ No
Pro recommended
Category
Body
System
📖 What Does B0126 Mean?
The immobilizer system has detected a malfunction, preventing the vehicle from starting or running. This code indicates a problem with the immobilizer system's communication or authentication process.
⚠️
Symptoms
- • Vehicle will not start
- • or starts and stalls immediately
- • or has intermittent starting issues
🔍
Common Causes
- • Faulty immobilizer module
- • damaged or corroded wiring
- • faulty key fob battery
- • or incorrect key fob programming
Fix Guide
🛠️
Possible Solutions
1. Check and replace the immobilizer module if faulty. 2. Inspect and repair or replace damaged or corroded wiring. 3. Replace the key fob battery if faulty. 4. Re-program the key fob if necessary. 5. Update the immobilizer system software if available.
Required Parts
Tools
multimeter
diagnostic scan tool
wiring tester
👨🔧
Need a Pro?
Complex codes like B0126 can be tricky. Don't risk it if you're unsure.
Quick Stats
Severity
High
DIY Friendly
No
Est. Time
1-2 hours
🔗
Related Diagnostic Codes
Other codes that may appear with B0126
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