Lost Communication with Immobilizer Control Module
2001-2001 Cadillac DeVille 4.6L V8 Northstar
The 2001 Cadillac DeVille is equipped with a 4.6L V8 engine. Below you'll find detailed u0167 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
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.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
U0167 on Other Vehicles
Common Questions
What does code U0167 mean on a 2001-2001 Cadillac DeVille?
U0167 stands for "Lost Communication with Immobilizer Control Module". Cannot communicate with the vehicle immobilizer/theft deterrent module.
What are the symptoms of U0167 on a Cadillac DeVille?
Common symptoms of U0167 include: Vehicle will not start, Security light flashing, Key not recognized, Immobilizer warning on.
What causes U0167 on a 2001-2001 Cadillac DeVille?
Common causes of U0167 include: Immobilizer module failure, CAN bus wiring, Module power loss, Fuse blown, Key transponder issue, Antenna ring failure.
Last updated: March 2026