Code Definition

U0128 — Lost Communication With Park Brake Module

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

About U0128

U0128 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 U0128 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

Control modules on the vehicle network exchange data with the electric park brake (EPB) module to coordinate parking brake apply and release commands, status reporting, and system diagnostics. DTC U0128 is set when a receiving module does not receive valid CAN messages from the park brake module within a calibrated time period while the rest of the network remains operational. This indicates the park brake module is not communicating because of loss of power or ground, an open, short, or high resistance fault in its CAN connection, or an internal module failure. When this code is set the drive...

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