U0167high severityNetwork
Lost Communication with Immobilizer Control Module
on 2003 Audi A6 2.7L Turbo V6 · AWD
What this code means
Cannot communicate with the vehicle immobilizer/theft deterrent module.
Symptoms
- Vehicle will not start
- Security light flashing
- Key not recognized
- Immobilizer warning on
Common causes
- Immobilizer module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- Key transponder issue
- Antenna ring failure
Diagnostic steps
- Check immobilizer module fuse
- Test power and ground
- Check CAN wiring
- Test key transponder signal
- Inspect antenna ring around ignition
- Check for correct key programming
Repair notes
Security system. Check key transponder and antenna ring. May need key relearning procedure.
Other Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High
U0009
High Speed CAN Communication Bus Shorted Together
U0010
Medium Speed CAN Communication Bus