Fix Cost
$100 - $500
Parts & Labor
Difficulty
3/5
Moderate
1-2 hours
DIY Possible?
❌ No
Pro recommended
Category
Body
System
📖 What Does B0078 Mean?
The immobilizer system has malfunctioned, preventing the vehicle from starting or running. This code indicates a problem with the immobilizer system's communication with the engine control module.
⚠️
Symptoms
- • Vehicle will not start
- • or will start and then stall
- • or will not run due to immobilizer system malfunction
🔍
Common Causes
- • Faulty immobilizer key fob
- • faulty immobilizer system module
- • faulty wiring or connectors
- • software issue
Fix Guide
🛠️
Possible Solutions
1. Check the immobilizer key fob's battery level and replace if necessary. 2. Check the immobilizer system module for any signs of physical damage or corrosion. 3. Inspect and clean the wiring and connectors for any signs of damage or corrosion. 4. Update the vehicle's software if necessary. 5. Replace the immobilizer system module if none of the above steps resolve the issue.
Required Parts
Tools
multimeter
wire tester
diagnostic scanner
👨🔧
Need a Pro?
Complex codes like B0078 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 B0078
B0000
Same System
Airbag System Malfunction (B0000)
High
B0001
Same System
Body System Code B0001: Climate Control Malfunction
Medium
B0002
Same System
Body System Code B0002: Door Locks Malfunction
Medium
B0003
Same System
Body System Code B0003: Windows
Medium
B0004
Same System
Seat Position Sensor Malfunction
Medium
B0005
Same System
Body System Code B0005: Lighting Malfunction
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