Immobilizer System General Malfunction
2002-2004 Audi A6 3.0L V6 🇩🇪
Description
A general fault detected in the engine immobilizer system. The immobilizer prevents engine starting without a recognized key or transponder.
Symptoms
- Engine cranks but will not start
- Security/immobilizer warning light on
- Key not recognized
- Intermittent no-start condition
Common Causes
- Faulty key transponder
- Immobilizer antenna ring failure
- Immobilizer control module fault
- Key not programmed to vehicle
- Weak key battery
Diagnostic Steps
- Try spare key
- Check immobilizer warning light pattern
- Scan immobilizer module for specific codes
- Test transponder ring antenna
- Verify key programming status
Repair Notes
Try spare key first. Reprogram key to immobilizer if needed. Replace antenna ring or immobilizer module if faulty.
Related Codes
Other Body Codes
- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0006Passenger Knee Airbag Deployment Circuit
- B0010Driver Side Airbag Deployment
- B0011Driver Side Airbag Deployment Circuit Open
- B0012Driver Side Airbag Deployment Circuit Short to Ground
- B0013Driver Side Airbag Deployment Circuit Short to Battery
B0100 on Other Vehicles
Common Questions
What does code B0100 mean on a 2002-2004 Audi A6?
B0100 stands for "Immobilizer System General Malfunction". A general fault detected in the engine immobilizer system. The immobilizer prevents engine starting without a recognized key or transponder.
What are the symptoms of B0100 on a Audi A6?
Common symptoms of B0100 include: Engine cranks but will not start, Security/immobilizer warning light on, Key not recognized, Intermittent no-start condition.
What causes B0100 on a 2002-2004 Audi A6?
Common causes of B0100 include: Faulty key transponder, Immobilizer antenna ring failure, Immobilizer control module fault, Key not programmed to vehicle, Weak key battery.