OBD-II code · Network
U0102 Lost Communication with Transfer Case Control Module
The Transfer Case Control Module has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. Four-wheel-drive range selection and torque distribution become unavailable. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
Is it safe to drive with U0102?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyTransfer case module unpowered
- PossibleCAN wiring to transfer case module broken
- Less likelyGateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Transfer Case Control Module, Can Bus Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.