Code Definition

U0137 (87) — Lost Communication With Trailer Brake Control Module

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

About U0137

U0137 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 U0137 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 U0137 indicates lost communication with the Trailer Brake Control Module. On vehicles fitted with an integrated trailer brake controller, this module manages electric trailer brake output and communicates over the CAN network with the ABS and other modules. The code sets when valid messages from the Trailer Brake Control Module are not received within a calibrated time. The result is usually loss of integrated trailer braking, a trailer brake warning message, and on some vehicles related ABS or stability warnings, leaving the trailer brakes uncontrolled by the vehicle system until communic...

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