Code Definition

U0102 — Lost Communication with Transfer Case Control Module (TCCM)

System: Network Communication  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About U0102

U0102 is a generic (obd-ii standard) network communication diagnostic trouble code. It belongs to the U-prefix family of codes, which covers inter-module network communication (CAN, LIN, FlexRay, or similar) faults.

Scanning & clearing: Network (U) codes report communication faults between modules. When diagnosing U-codes, checking the vehicle's CAN bus integrity, supply/ground at each module, and reading all modules for related faults is usually the first step.

Because U0102 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Transfer Case Control Module (TCCM) manages electronic range selection on four wheel drive and all wheel drive vehicles, driving the transfer case shift motor or clutch actuator and reporting drive range status to the rest of the vehicle. U0102 sets when another module, commonly the powertrain control module, ABS module, or instrument cluster, stops receiving expected messages from the TCCM for a calibrated period. The cause may be a loss of power or ground at the TCCM, an open or short in the bus wiring serving it, or a failure within the module itself. When the code is stored the vehicle...

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