U0102 on Kia
Lost Communication With Transfer Case Control Module
U0102 on Kia vehicles indicates lost communication with transfer case control module. Au7o has documented this code across 1 Kia model — most commonly on Seltos. 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.
Common Causes of U0102
- •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
U0102 on Kia by Model
Kia Seltos(1 issue)
- 4WD ECU Water Intrusion Under Driver's Seat — AWD Warning Light and Loss of All-Wheel Drive2021-2023
On AWD Seltos (SP2) the 4WD Electronic Control Unit is mounted on the floor under the driver's seat. Snow and slush tracked in on boots melts in the driver's footwell and the meltwater migrates rearward into the ECU, corroding the circuit board. The unit then faults out, illuminating the 4WD warning light and dropping the vehicle into front-wheel drive only. Kia opened voluntary service campaign SC297 covering 2021-2023 AWD Seltos built 11/20/2019-03/02/2023 that were sold or registered in 36 snowbelt states plus DC, which is a strong indicator of how region-correlated the failure is. Owners typically see it first in the second or third winter.
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View U0102 across all makes →Frequently Asked Questions
What does U0102 mean on Kia?▼
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. On Kia specifically, this code is documented across 1 model.
What causes U0102 on Kia vehicles?▼
Common causes on Kia: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U0102 on a Kia?▼
Repair costs vary widely depending on the root cause and specific Kia model.
Which Kia models have U0102 documented?▼
Au7o has documented U0102 on 1 Kia model: Seltos.