U0102
Lost Communication With Transfer Case Control Module
Severity: MEDIUM
Symptoms
- Check Engine Light Is On
- Four-wheel drive does not work
- Switching drive modes is not possible
- The car goes into emergency mode
Causes
- Broken or damaged wires in the communication circuit
- Poor contact in module connectors
- Transfer case control module malfunction
- Module power problems
- Software failure in the module
How to Fix
- Check the integrity of the wiring harness to the module
- Inspect and clean the connector contacts
- Check fuses and relays associated with the module
- Test the control module on the bench
- If necessary, replace the control module