Code Definition

U2108 — Lost Communication With Electronic Brake Control Module

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

About U2108

U2108 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 U2108 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 Electronic Brake Control Module (EBCM) manages antilock braking, traction control, and stability control, and continuously shares wheel speed, brake pressure, and system status data with other modules over the vehicle communication network. U2108 sets when another module, commonly the powertrain control module, body control module, or instrument cluster, stops receiving expected messages from the EBCM for a calibrated period. The loss may result from the EBCM losing power or ground, a break or short in the bus wiring, or the module itself failing to transmit onto the network. When this cod...

Join TaT to view the complete code information and diagnostic details.

Quick Facts