Code Definition

U0104 — Lost Communication With Cruise Control Module

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

About U0104

U0104 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 U0104 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 Cruise Control Module manages the cruise control function and speed regulation and shares its status and requests with the Powertrain Control Module over the CAN data network. On some vehicles this is a standalone module, while on others the function is built into another controller such as the PCM or BCM. DTC U0104 is a generic network code set when a receiving module stops receiving valid CAN messages from the Cruise Control Module for a calibrated period while the ignition is on and the rest of the network is communicating. The fault usually means the module has gone offline due to loss...

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