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
To diagnose U0102, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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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.