📖 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
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.
Recommended Parts & Tools
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📦 Parts Needed
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Frequently Asked Questions about B0078
How serious is B0078?
This code has a high severity level. You should address this issue immediately to prevent engine damage.
Can I drive with B0078?
Driving with this code is not recommended as it may cause further engine damage.
How much does it cost to fix B0078?
Repair costs vary depending on the root cause, but typically range from $200-500 including parts and labor.
Related Diagnostic Codes
Other codes that may appear with B0078
Airbag System Malfunction (B0000)
Body System Code B0001: Climate Control Malfunction
Body System Code B0002: Door Locks Malfunction
Body System Code B0003: Windows
Seat Position Sensor Malfunction
Body System Code B0005: Lighting Malfunction
💡 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