U0102: Lost Communication With Transfer Case Control Module
2 vehicles · 1 makes · $300-$4,500 repair
Most Reported On
U0102 is an OBD-II diagnostic trouble code meaning “Lost Communication With Transfer Case Control Module.” This network (U) code means a module on the vehicle's communication bus has lost contact with the transfer case control module. The transfer case control module manages four-wheel-drive and all-wheel-drive engagement, so loss of communication typically disables 4WD/AWD functions and lights a warning. The fault is most often in the wiring, connectors, power, or ground feeding the module rather than the bus itself. Regular braking and driving generally continue, but the affected drivetrain features may be unavailable. This code is most commonly reported on 2005-2016 Land Rover Discovery, and 2005-2013 Land Rover Range Rover Sport, with repair costs ranging from $300 to $4,500.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
This is a network/communication code. A basic engine-code reader will not show it — you need a scanner that reads all modules. These read U0102.
One caveat that applies to every scanner: only powertrain codes are standardised across manufacturers. Body, chassis and network coverage is "enhanced" diagnostics, and how deep it goes varies by make and model year — check your specific vehicle against the tool's coverage list before buying.
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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FAQ
What does U0102 mean?
U0102 stands for "Lost Communication With Transfer Case Control Module." This network (U) code means a module on the vehicle's communication bus has lost contact with the transfer case control module. The transfer case control module manages four-wheel-drive and all-wheel-drive engagement, so loss of communication typically disables 4WD/AWD functions and lights a warning. The fault is most often in the wiring, connectors, power, or ground feeding the module rather than the bus itself. Regular braking and driving generally continue, but the affected drivetrain features may be unavailable.
What are the most common causes of U0102?
The most common causes of U0102 are: Corroded or damaged connector at the transfer case module, Wiring fault (open/short) in the CAN bus or power/ground, Loss of power or poor ground to the module, Faulty transfer case control module, Water/road-salt intrusion into the harness, Blown fuse feeding the module. The specific cause varies by vehicle.
How much does it cost to fix U0102?
Repair costs for U0102 range from $300 to $4,500, depending on the vehicle and root cause.
Which vehicles are affected by U0102?
Au7o has documented U0102 across 2 vehicle models from 1 manufacturers: Land Rover.
Sources (4)
- ForumRangeRovers.net: Trans Failsafe Transfer case motor? Noise on actuator signal
- ForumRangeRovers.net: Has anyone had to replaced their Transfer Case Motor?
- manufacturerKMotors: Common Problems & Fixes - Range Rover Sport L320
- manufacturerRover Parts: Land Rover EPB Fault Discovery 4 and Range Rover Sport L320
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.