U0102high severityNetwork
Lost Communication with Transfer Case Control Module
on 2014 Ram 2500 6.7L I6 Cummins Diesel · 4WD
What this code means
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.
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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