Code Definition

U0106 (87) — Lost Communication With TCU (Transmission Control Unit)

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

About U0106

U0106 is a generic (obd-ii standard) network communication diagnostic trouble code recorded for LDV vehicles. 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 U0106 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

DTC U0106:87 is set when one or more control modules on the vehicle CAN network detect a loss of communication with the Transmission Control Unit (TCU) for longer than the calibrated timeout period. The fault is logged when expected CAN messages from the TCU are missing, invalid, or not updating, indicating that the TCU is offline or unable to communicate reliably. The 87 sub code indicates that the expected messages are simply not being received. Depending on the vehicle configuration this condition can result in transmission default operation, a limp home strategy, harsh or delayed shifts, o...

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