Lost Communication with Transfer Case Control Module
1998-1998 Buick Century 3.1L V6
The 1998 Buick Century is equipped with a 3.1L V6 engine. Below you'll find detailed u0102 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Cannot communicate with the transfer case control module that manages AWD/4WD operation.
Symptoms
- 4WD/AWD warning light on
- Transfer case stuck in mode
- Cannot switch between 2WD and 4WD
- Service 4WD message
Common Causes
- Transfer case module power failure
- CAN bus wiring to module
- Transfer case module failure
- Fuse blown
- Connector corrosion
Diagnostic Steps
- Check transfer case module fuse
- Test module power and ground
- Inspect CAN bus wiring to module
- Try direct communication with module
- Check connector for corrosion
Repair Notes
Check fuses and power supply first. Common on trucks after water fording.
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
U0102 on Other Vehicles
Common Questions
What does code U0102 mean on a 1998-1998 Buick Century?
U0102 stands for "Lost Communication with Transfer Case Control Module". Cannot communicate with the transfer case control module that manages AWD/4WD operation.
What are the symptoms of U0102 on a Buick Century?
Common symptoms of U0102 include: 4WD/AWD warning light on, Transfer case stuck in mode, Cannot switch between 2WD and 4WD, Service 4WD message.
What causes U0102 on a 1998-1998 Buick Century?
Common causes of U0102 include: Transfer case module power failure, CAN bus wiring to module, Transfer case module failure, Fuse blown, Connector corrosion.
Last updated: March 2026