17978high severityBody
Engine Start Blocked by Immobilizer
on 2008 Audi A6 4.2L V8 · AWD
What this code means
The immobilizer system has prevented the engine from starting because the key was not recognized. Equivalent to OBD code P1570.
Symptoms
- Engine cranks but will not start
- Immobilizer warning on dash
- Key not recognized
Common causes
- Faulty or unprogrammed key
- Weak key transponder or battery
- Failed immobilizer antenna ring
- ECU/immobilizer communication fault
Diagnostic steps
- Try a known-good programmed key
- Check immobilizer adaptation status
- Test key transponder signal
- Inspect antenna ring at ignition
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Other Body codes on this vehicle
B0001
Driver Frontal Stage 1 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0005
Driver Knee Airbag Deployment Circuit
B0006
Passenger Knee Airbag Deployment Circuit
B0007
Rear Left Side Airbag Deployment Circuit
B0008
Rear Right Side Airbag Deployment Circuit
B0010
Driver Side Airbag Deployment
B0011
Driver Side Airbag Deployment Circuit Open